Fixed Lens Mounts

Fixed Mounts for Numerous Optic Diameters
4-40 (M3) or 8-32 (M4) Tap for Post Mounting
Stainless Steel Lens Adapters Available for Small Optics

LMR2

Shown with a
Plano-Convex Lens

LMR1S

SMR05

Shown with
a Ge Lens

LMRA10

LMRA5

LMR05

Shown with LMRA6 Adapter

Small Optic Adapters

Mount Small Optics in Larger Diameter Mounts

LMR1V

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Overview
Threading Specs
Feedback

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Fixed Lens Mount Comparison
Fixed Lens Mounts Feature Internal Threads and a Retaining Lip (MLHx, LMRx), Internal and External Threads (LMRxS), or Internal Threads (SMRx)

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LMRA Series Adapters for Mounting Small Optics

Features

Internally Threaded Mounts for 20 Optic Diameters from Ø5 mm to Ø4"
Internally and Externally SM-Threaded Mounts for Combining Optics and SM-Threaded Components
Internally SM-Threaded Mounts With or Without Retaining Lip
Adapters for Mounting Small Optics from Ø2 mm to Ø10 mm in Threaded Lens Mounts
Retaining Rings for Securing Optics in Place
Drop-In Alignment Plates for Fast Beam Alignment
Spanner Wrenches and Spanner Bits for Safe and Easy Optic Placement

Mini-Series Fixed Lens Mounts with Internal Threads (MLHx Series)
Our Mini-Series Fixed Optic Mounts (MLHx series) are available for seven distinct optic diameters ranging from Ø5 mm to Ø1/2", feature internal threading, and come complete with one retaining ring for securing the optic in place. A bottom-located 4-40 (M3) tapped hole is provided to mount directly to our Ø6 mm Mini-Series posts or Ø12 mm pedestal posts. Our Mini-Series post holders allow our Ø6 mm posts to be mounted onto our Mini-Series breadboards.

Fixed Lens Mounts with Internal Threads (LMRx Series)
Our standard fixed optic mounts (LMRx series) are available for 20 distinct optic diameters ranging from Ø5 mm to Ø4", feature internal threading, and come complete with one retaining ring for securing the optic in place. A bottom-located 8-32 (M4) tapped hole is provided for mounting on Ø1/2" posts. Our most popular fixed optic mounts in this series, the LMR05(/M), LMR1(/M), and LMR2(/M), are available individually or in packs of 5 for convenience. The LMRx series also has vacuum-compatible versions: these unanodized 6061-T6 aluminum mounts are compatible with environments down to 10^-6 Torr directly out of the package.

Fixed Lens Mounts with Internal and External Threads (LMRxS Series)
Thorlabs also offers fixed mounts with both internal and external SM threading (LMRxS series), which are available for optic diameters of
Ø1/2", Ø1", and Ø2". Each LMRxS series mount also features an 8-32 (M4) tapped hole for Ø1/2" post mounting and comes complete
with a compatible retaining ring.

Fixed Lens Mounts with No Retaining Lip (SMRx Series)
To mount multiple lens tubes or mounted optics, Thorlabs offers a line of internally SM-threaded mounts with no retaining lip (SMRx series), available for optic diameters of Ø1/2", Ø1", and Ø2". These mounts can also be used to hold unmounted optics when combined with two retaining rings (not included). Like the LMRx and LMRxS series, these mounts also feature an 8-32 (M4) tapped hole for mounting on Ø1/2" posts.

Small Optic Adapters
For small optics (Ø10 mm or less), we offer glue-in stainless steel adapters, as shown to the right, that allow optics with various diameters ranging from Ø2.0 mm to Ø9.0 mm to be mounted in our SM05-threaded mounts, and optics with a Ø10 mm diameter to be mounted in our LMR18 mount. We also offer a line of small optic adapters with external SM1 threading, which can mount optics from Ø5 mm to
Ø20 mm in SM1-threaded lens mounts.

This page also features alignment plates for simple beam alignment, threaded retaining rings, spanner wrenches, and spanner bits for easy optic installation.

Fixed Lens Mounts Quick Links
Mini-Series Internally Threaded Mounts	Internally Threaded Mounts	Internally Threaded, Vacuum-Compatible Mounts	Internally and Externally SM-Threaded Mounts	Internally SM-Threaded Mounts without Retaining Lip	Adapters for Small Optics	Lens Mount Alignment Plates	Retaining Rings	Spanner Wrenches	Spanner Bits	Adjustable Spanner Wrench

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Threading Specifications

The following is a general overview of screw threading. For more details regarding specifications and dimensions, please consult the Machinery's Handbook, available for purchase at many bookstores.

Features of a Thread
A thread consists of three repeating features: a crest, flank, and root (see drawing to the right). Except in special cases, threads have symmetrical sides inclined at equal angles when a vertical line is drawn through the center of a crest or root. The distance between corresponding points on adjacent threads is known as the pitch of the thread. The flank angle is defined as the angle the flank makes with a perpendicular ray drawn from the screw axis. Unless otherwise stated, threads have a flank angle of 30°, resulting in a total angle between flanks of 60°. Each feature is shown in the diagram to the right.

The major diameter is taken from the crests of a thread while the minor diameter is taken from the roots. For most screws, crests and roots do not terminate at a sharp point, so crest and root truncation values are included in the definitions of major and minor diameter. The pitch diameter is approximately halfway between the major and minor diameters.

Thread Form
A thread form is a set of rules that define the features' scale relative to one another. Common thread forms include the Unified Screw Thread Form, used in the United States of America and measured in imperial units, and the ISO Metric Screw Thread Form, used in many parts of the world and measured with the International System of Units. There are many thread forms in the Unified screw thread standard designated by either UN, which defines a flat root contour, or UNR, which defines a round root contour. These can be further described by appending more letters. For example, an extremely fine thread with a flat root contour is designated UNEF. Those forms which are not standardized by the Unified screw thread system are designated UNS.

Thread Series
Most screws are identified by their thread series. Thread series are denoted by the major diameter and density of threads. Unified threads specify density in threads per inch, while Metric threads specify the thread pitch. For example, in the Unified nomenclature, a 1/4"-20 cap screw has a 1/4" diameter barrel and the pitch is 20 threads per inch (TPI). In metric nomenclature, an M4 x 0.7 cap screw has a 4 mm barrel and the pitch is 1 thread per 0.7 mm. The term M4 x 0.7 is often shortened to just M4.

Unified Thread Class Tolerancing
Location	Loose	Optimal	Strict
Internal	1B	2B	3B
External	1A	2A	3A

Metric Thread Tolerance Positions
Location	Loose	Optimal	Strict
Internal	-	G	H
External	e or f	g	h

Metric Thread Tolerance Grades
Dimension	Location	Tolerance Grades^a
Minor Diameter	Internal	4, 5, 6, 7, 8
Major Diameter	External	4, 6, 8
Pitch Diameter	Internal	4, 5, 6, 7, 8
Pitch Diameter	External	3, 4, 5, 6, 7, 8, 9

The tolerance becomes looser as the grade increases. The underlined grades are used with normal lengths of thread engagement.

Thread Class
The tolerances and allowances on a thread series are given by a thread class. Unified thread classes are alphanumeric identifiers starting with a number from 1 through 3, where 1 is the loosest tolerance and 3 is the tightest, and either A for external threading or B for internal threading.

Metric threads have a slightly more complex tolerancing method that uses tolerancing grades, designated by a number 3 through 9; and tolerancing positions, which use letters e through h. Grades provide a measure of the tolerance itself: the smaller the number, the tighter the tolerance. Positions denote the distance of the tolerance from the pitch diameter. Uppercase positioning letters indicate internal threads while lowercase positioning letters indicate external threads.

Quoting from the Machinery's Handbook, 29th Edition, p. 1885: "To designate the tolerance class, the grade and position of the pitch diameter is shown first followed by that for the major diameter in the case of the external thread or that for the minor diameter in the case of the internal thread, thus 4g6g for an external thread and 5H6H for an internal thread. If the two grades and positions are identical, it is not necessary to repeat the symbols, thus 4g, alone, stands for 4g4g and 5H, alone, stands for 5H5H."

Thorlabs' SM Series Threads
Threading specifications for our SM threads, utilized in our lens tube and cage system components, are given below so that you can machine mating components to suit your application. Most SM series threads utilize a non-standard Unified thread form, indicated by the letters UNS, with a 30° flank angle and a thread class of 2A and 2B. The exception is our SM30 series thread, which is a Metric thread form with a 30° flank angle and a tolerance of 6H/6g. We also offer products with C-Mount and RMS threads, and the specifications for these threads are given below for reference. Please note that other manufacturers may have different tolerances for C-Mount and RMS threads. For other thread specifications that are not listed here, please contact Tech Support.

SM05 Threading: Ø1/2" Lens Tubes, 16 mm Cage Systems
External Thread, 0.535"-40.0 UNS-2A		Internal Thread, 0.535"-40.0 UNS-2B
Max Major Diameter	0.5340"	Min Major Diameter	0.5350"
Min Major Diameter	0.5289"	Min Pitch Diameter	0.5188"
Max Pitch Diameter	0.5178"	Max Pitch Diameter	0.5230"
Min Pitch Diameter	0.5146"	Min Minor Diameter (and 83.3% of Thread)	0.508"
Max Minor Diameter	0.5069"	Max Minor Diameter (and 64.9% of Thread)	0.514"

RMS Threading: Objective, Scan, and Tube Lenses
External Thread, 0.800"-36.0 UNS-2A		Internal Thread, 0.800"-36.0 UNS-2B
Max Major Diameter	0.7989"	Min Major Diameter	0.8000"
Min Major Diameter	0.7934"	Min Pitch Diameter	0.7820"
Max Pitch Diameter	0.7809"	Max Pitch Diameter	0.7866"
Min Pitch Diameter	0.7774"	Min Minor Diameter (and 83.3% of Thread)	0.770"
Max Minor Diameter	0.7688"	Max Minor Diameter (and 64.9% of Thread)	0.777"

C-Mount Threading: Machine Vision Lenses, CCD/CMOS Cameras
External Thread, 1.000"-32.0 UN-2A		Internal Thread, 1.000"-32.0 UN-2B
Max Major Diameter	0.9989"	Min Major Diameter	1.0000"
Min Major Diameter	0.9929"	Min Pitch Diameter	0.9797"
Max Pitch Diameter	0.9786"	Max Pitch Diameter	0.9846"
Min Pitch Diameter	0.9748"	Min Minor Diameter (and 83.3% of Thread)	0.966"
Max Minor Diameter	0.9651"	Max Minor Diameter (and 64.9% of Thread)	0.974"

SM1 Threading: Ø1" Lens Tubes, 30 mm Cage Systems
External Thread, 1.035"-40.0 UNS-2A		Internal Thread, 1.035"-40.0 UNS-2B
Max Major Diameter	1.0339"	Min Major Diameter	1.0350"
Min Major Diameter	1.0288"	Min Pitch Diameter	1.0188"
Max Pitch Diameter	1.0177"	Max Pitch Diameter	1.0234"
Min Pitch Diameter	1.0142"	Min Minor Diameter (and 83.3% of Thread)	1.008"
Max Minor Diameter	1.0068"	Max Minor Diameter (and 64.9% of Thread)	1.014"

SM30 Threading: Ø30 mm Lens Tubes
External Thread, M30.5 x 0.5 – 6H/6g		Internal Thread, M30.5 x 0.5 – 6H/6g
Max Major Diameter	30.480 mm	Min Major Diameter	30.500 mm
Min Major Diameter	30.371 mm	Min Pitch Diameter	30.175 mm
Max Pitch Diameter	30.155 mm	Max Pitch Diameter	30.302 mm
Min Pitch Diameter	30.059 mm	Min Minor Diameter (and 83.3% of Thread)	29.959 mm
Max Minor Diameter	29.938 mm	Max Minor Diameter (and 64.9% of Thread)	30.094 mm

SM1.5 Threading: Ø1.5" Lens Tubes
External Thread, 1.535"-40 UNS-2A		Internal Thread, 1.535"-40 UNS-2B
Max Major Diameter	1.5339"	Min Major Diameter	1.535"
Min Major Diameter	1.5288"	Min Pitch Diameter	1.5188"
Max Pitch Diameter	1.5177"	Max Pitch Diameter	1.5236"
Min Pitch Diameter	1.5140"	Min Minor Diameter (and 83.3% of Thread)	1.508"
Max Minor Diameter	1.5068"	Max Minor Diameter (and 64.9% of Thread)	1.514"

SM2 Threading: Ø2" Lens Tubes, 60 mm Cage Systems
External Thread, 2.035"-40.0 UNS-2A		Internal Thread, 2.035"-40.0 UNS-2B
Max Major Diameter	2.0338"	Min Major Diameter	2.0350"
Min Major Diameter	2.0287"	Min Pitch Diameter	2.0188"
Max Pitch Diameter	2.0176"	Max Pitch Diameter	2.0239"
Min Pitch Diameter	2.0137"	Min Minor Diameter (and 83.3% of Thread)	2.008"
Max Minor Diameter	2.0067"	Max Minor Diameter (and 64.9% of Thread)	2.014"

SM3 Threading: Ø3" Lens Tubes
External Thread, 3.035"-40.0 UNS-2A		Internal Thread, 3.035"-40.0 UNS-2B
Max Major Diameter	3.0337"	Min Major Diameter	3.0350"
Min Major Diameter	3.0286"	Min Pitch Diameter	3.0188"
Max Pitch Diameter	3.0175"	Max Pitch Diameter	3.0242"
Min Pitch Diameter	3.0133"	Min Minor Diameter (and 83.3% of Thread)	3.008"
Max Minor Diameter	3.0066"	Max Minor Diameter (and 64.9% of Thread)	3.014"

SM4 Threading: Ø4" Lens Tubes
External Thread, 4.035"-40 UNS-2A		Internal Thread, 4.035"-40.0 UNS-2B
Max Major Diameter	4.0337"	Min Major Diameter	4.0350"
Min Major Diameter	4.0286"	Min Pitch Diameter	4.0188"
Max Pitch Diameter	4.0175"	Max Pitch Diameter	4.0245"
Min Pitch Diameter	4.0131"	Min Minor Diameter (and 83.3% of Thread)	4.008"
Max Minor Diameter	4.0066"	Max Minor Diameter (and 64.9% of Thread)	4.014"

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Posted Comments:

Matthijs Kok (posted 2022-08-03 14:51:23.443)

Dear Sir/Madame, I was looking for a lens mount that has a vertical edge on the side as well, so we can use that edge to align the mount. This will ensure that the mount will stay parallel to the other mounts (if a custom base plate is used). Are there other mount the we could use for that or is this something you are interested in making? I am looking forward to your response. Kind regards, Matthijs Kok Dispertech

jdelia (posted 2022-08-05 02:04:59.0)

Thank you for contacting Thorlabs. I have reached out to you directly to clarify your inquiry and discuss potential solutions.

Ben Garber (posted 2022-05-09 19:08:31.77)

It would be really useful to us if you offered a version of the LMR1 lens mount with a 1" beam height. In particular, being able to mount the lens on a pedestal post and have the optic height precisely right would be a big improvement for us. As is, we have to get an 1/8" spacer and then it's still ever so slightly off. The same goes for the FMP1 mirror mount, though there it's significantly less annoying to have the optic height slightly off.

cdolbashian (posted 2022-05-20 04:33:39.0)

Thank you for reaching out with this feedback Ben. While we do not have a post-mountable option which will satisfy your requirements, perhaps you will have better luck using a cage system, in which all optics mounted are centered within the cage assembly, making the vertical alignment process much easier for individual components. I have reached out directly to discuss other options.

karin fulford (posted 2021-08-19 13:01:55.037)

I recommend making this vacuum part available without the retainer lip, i.e. threads throughout. thanks

cdolbashian (posted 2021-08-27 11:14:26.0)

Thank you for your feedback Karin. We take feedback seriously here, and will look into the feasibility of this as a stock product in the future.

Victor Ortiz (posted 2021-05-26 09:02:10.66)

Hi, We recently purchased some optical filters with sutter threaded rings (https://www.semrock.com/sutter-threaded-rings.aspx). Do you have any mount that can house these? I have tried the LMR1 but they are not the same thread, I'm wondering if the metric version will work. Thanks.

YLohia (posted 2021-08-27 02:24:51.0)

Hello Victor, thank you for contacting Thorlabs. Unfortunately, we have never worked with this tread type before. You will have to contact Semrock to find out the thread type / thread specs and let us know that information in order for us to suggest the appropriate mount. I had reached out to you at the time of your original post, but never heard back. Please feel free to email us at techsupport@thorlabs.com if you have further questions.

Till Liepmann (posted 2020-09-17 16:30:03.693)

Lens mount needs instructions on proper installation of lens. Use of this mount resulted in increased costs and difficulty due to the lens being loose as a result of off center initial lens position. Ring retainer tightened, but it's not possible to tell if lens is centered due to the ring covering from view the lens edge and mount barrel. Retaining ring contacts lens and tightens normally, but the lens isn't centered. Further, in this situation, thermal cycling can cause the lens to come loose and is not loose in cell. Need written procedure to avoid this problem. This is particularly true with achromats, since the radii of curvature of the lens surfaces are larger than a singlet lens of the same focal length,

llamb (posted 2020-09-19 09:20:57.0)

Hello Till, thank you for your feedback. I have reached out to you directly to gather more information and troubleshoot, so we can consider these suggestions further as well.

user (posted 2018-08-25 19:04:05.513)

It would be really useful if you offered your lens mounts with consistent beam heights that are multiples/fractions of 25 mm/1 inch to match standard heights. It would make it so much easier to use them with 1 inch fixed height posts (which we use almost exclusively for ease of alignment, stability and vibration damping) without height adapters. Even if you useand often you end up a few 100 um off the desired height. This point is more a general observation I have made on many Thorlabs products during my almost 9 years working with optics and optomechanics. It also applies to other optomechanical components like cage mounts, rotation mounts etc. Many competitors do offer these, the main reason to stay with Thorlabs (and adapters) for non-adjustable optomechanics are short turnover times. I know many colleagues in many research groups who are wondering exactly the same thing.

llamb (posted 2018-08-27 11:27:39.0)

Thank you for your feedback. Many of our standard LMR- series mounts have been released over the course of several years, accounting for some incongruous beam heights with their designs. We are looking into ways to resolve this issue, possibly by using height spacers to put lens mounts at regular beam height intervals. Our newer MLH- Mini-Series lens mounts do account for this design idea and feature a consistent 10 mm beam height.

sergei.kuhn (posted 2018-06-19 15:03:34.007)

Do you offer this product in a vacuum compatible version (up to 10^-6 mbar)?

YLohia (posted 2018-06-19 10:17:41.0)

Hello, thank you for contacting Thorlabs. Please reach out to your local Thorlabs Tech Support team (Europe@thorlabs.com / +49 (0) 8131-5956-2) for a quote for an unanodized version of the mount you want from this page.

clinton.cass (posted 2018-04-24 13:15:28.527)

It would be very useful if the fixed lens mounts had a marking on the outside indicating the vertical position of the optic axis. In other words, something to measure the height of the center of the optic off of the table.

llamb (posted 2018-04-25 03:38:27.0)

Thank you for your feedback! I will post this idea to our internal product forum.

segreto (posted 2017-10-10 12:06:19.457)

For calibration purposes I would like to precisely know the clear area of adapters like LMRA8 and LMRA9. Which is the accuracy on the indicated clear aperture diameter? Do you have any aperture (7-8 mm diam.) with NIST traceable measurement of the clear area?

tfrisch (posted 2017-10-11 02:56:50.0)

Hello, thank you for contacting Thorlabs. None of these mounts have any NIST traceable documentation on the inner diameter aperture, so I would not treat them as a precision aperture. I will reach out to you directly about custom precision apertures, however.

Tyler (posted 2009-03-12 10:55:02.0)

A response from Tyler at Thorlabs to stevenbearden: Thank you for telling us that we are on the right track to providing you the information you need to choose the correct products. If in the future you have any suggestions on how to further improve the presentation of the products or have additional input on a presentation feature that you like, please let us know.

stevenbearden (posted 2009-03-11 19:09:18.0)

Just a note to thank you for a wonderful website. I am helping a small company design an enclosure that will utilize some THORLAB hardware inside. I have never visited a site for dimensional information and found what I needed as fast and easy (and accurately!) as I did today on yours. Great job to those that did the work, and of course those that saw the need from within your company. I will promote the use of your products in future designs. Keep up the great work, we (out here) DO appreciate it! Sincerely, Steven Bearden

Mini-Series Fixed Lens Mounts with Internal Threads, 4-40 (M3) Tap

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LMR1 with ZnSe lens mounted in 1/2" post

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Item #	Qty	Description
Imperial Product List
MLH10	1	Mini-Series Lens Mount with Retaining Ring for Ø10 mm Optics, 4-40 Tap
AL108-B	1	Ø10 mm S-LAH64 Aspheric Lens, f=8 mm, NA=0.55, ARC: 650-1050 nm
MSRA90	1	Mini-Post Right-Angle Post Clamp, Fixed 90° Adapter
MS2R	2	Mini-Series Optical Post, Ø6 mm, L = 2"
MPH50	1	Pedestal-Base Mini-Series Post Holder with Flexure Clamp, 50 mm (1.97") Tall
MBA1	1	Mini-Series Pedestal Post Holder Base, #8 (M4) Slot
MSB12	1	12" x 12" x 3/8" Mini-Series Aluminum Breadboard, 8-32 and 1/4"-20 High-Density Taps

View Metric Product List

Item #	Qty	Description
Metric Product List
MLH10/M	1	Mini-Series Lens Mount with Retaining Ring for Ø10 mm Optics, M3 Tap
AL108-B	1	Ø10 mm S-LAH64 Aspheric Lens, f=8 mm, NA=0.55, ARC: 650-1050 nm
MSRA90	1	Mini-Post Right-Angle Post Clamp, Fixed 90° Adapter
MS2R/M	1	Mini-Series Optical Post, Ø6 mm, L = 50 mm
MPH50	1	Pedestal-Base Mini-Series Post Holder with Flexure Clamp, 50 mm (1.97") Tall
MBA1	1	Mini-Series Pedestal Post Holder Base, #8 (M4) Slot
MS12B/M	1	300 mm x 300 mm x 9.5 mm Mini-Series Aluminum Breadboard, M3 High-Density Taps

MLH10 Mounted at 90° Using Right-Angle Adapter Post-Mounted to Aluminum Breadboard

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MLH05 Mounted on a Post Held by an MPH25 Post Holder

Accommodates Various Optic Diameters from Ø5 mm to Ø1/2"
Internally Threaded
4-40 (M3) Tapped Hole Allows for Mounting to Ø6 mm Mini-Series Posts
Includes Compatible Retaining Ring

These Mini-Series Fixed Lens Mounts are compact, lightweight mounts for seven distinct optic diameters ranging from Ø5 mm to Ø1/2". Each mount features internal threading and ships with a retaining ring for securing an optic into place. The internal threading is deep enough to hold most unmounted optics or externally threaded components. The base of each mount features an 4-40 (M3) tapped hole, which allows for easy mounting to Ø6 mm Mini-Series posts, as shown to the right. Additional retaining rings are sold separately below.

Item #	Optic Diameter	Max Optic Thickness^a	Clear Aperture^b	Optical Height	Included Retaining Ring	Suggested Spanner Wrench	Suggested Spanner Bit
MLH5(/M)	Ø5 mm	0.16" (4.0 mm)	Ø0.15" (Ø3.8 mm)	0.39" (10 mm)	SM5RR	SPW205 or SPW801	-
MLH6(/M)	Ø6 mm	0.16" (4.0 mm)	Ø0.19" (Ø4.8 mm)	0.39" (10 mm)	SM6RR	SPW206 or SPW801	-
MLH7(/M)	Ø7 mm^c	0.21" (5.3 mm)	Ø0.23" (Ø5.8 mm)	0.39" (10 mm)	SM7RR	SPW207 or SPW801	-
MLH8(/M)	Ø8 mm^d	0.21" (5.3 mm)	Ø0.27" (Ø6.9 mm)	0.39" (10 mm)	SM8RR	SPW208 or SPW801	-
MLH9(/M)	Ø9 mm	0.21" (5.3 mm)	Ø0.31" (Ø7.9 mm)	0.39" (10 mm)	SM9RR	SPW209 or SPW801	-
MLH10(/M)	Ø10 mm	0.21" (5.3 mm)	Ø0.35" (Ø8.8 mm)	0.39" (10 mm)	SM10RR	SPW210 or SPW801	-
MLH05(/M)	Ø1/2"^e,f	0.21" (5.3 mm)	Ø0.44" (Ø11.0 mm)	0.39" (10 mm)	SM05RR	SPW603, SPW603L, or SPW801	SPB05

This specification is true for thin lenses. For lenses with small focal lengths, and hence large lens curvatures, please contact Tech Support to ensure a proper fit.
This specification refers to the clear aperture of the retaining ring used to mount the optic.
The MLH7(/M) can also be used to secure Ø6.35 mm optics.
The MLH8(/M) can also be used to secure Ø7.40 mm optics.
The MLH05(/M) can also be used to secure Ø12.5 mm optics, and a range of smaller optic diameters can be accomodated using our small optic adapters.
A drop-in alignment plate is available for the MLH05(/M) for quick, easy alignment.

Based on your currency / country selection, your order will ship from Newton, New Jersey

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MLH5	Customer Inspired! Mini-Series Lens Mount with Retaining Ring for Ø5 mm Optics, 4-40 Tap

$31.42

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MLH6	Customer Inspired! Mini-Series Lens Mount with Retaining Ring for Ø6 mm Optics, 4-40 Tap

$37.38

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MLH7	Customer Inspired! Mini-Series Lens Mount with Retaining Ring for Ø7 mm Optics, 4-40 Tap

$36.89

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MLH8	Customer Inspired! Mini-Series Lens Mount with Retaining Ring for Ø8 mm Optics, 4-40 Tap

$37.00

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MLH9	Customer Inspired! Mini-Series Lens Mount with Retaining Ring for Ø9 mm Optics, 4-40 Tap

$37.53

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MLH10 Customer Inspired! Mini-Series Lens Mount with Retaining Ring for Ø10 mm Optics, 4-40 Tap

$36.96

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MLH05 Customer Inspired! Mini-Series Lens Mount with Retaining Ring for Ø1/2" Optics, 4-40 Tap

$31.42

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+1 Qty Docs Part Number - Metric Price Available

MLH5/M Customer Inspired! Mini-Series Lens Mount with Retaining Ring for Ø5 mm Optics, M3 Tap

$31.42

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MLH6/M Customer Inspired! Mini-Series Lens Mount with Retaining Ring for Ø6 mm Optics, M3 Tap

$37.38

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MLH7/M Customer Inspired! Mini-Series Lens Mount with Retaining Ring for Ø7 mm Optics, M3 Tap

$36.89

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MLH8/M Customer Inspired! Mini-Series Lens Mount with Retaining Ring for Ø8 mm Optics, M3 Tap

$37.00

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MLH9/M Customer Inspired! Mini-Series Lens Mount with Retaining Ring for Ø9 mm Optics, M3 Tap

$37.53

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MLH10/M Customer Inspired! Mini-Series Lens Mount with Retaining Ring for Ø10 mm Optics, M3 Tap

$36.96

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MLH05/M Customer Inspired! Mini-Series Lens Mount with Retaining Ring for Ø1/2" Optics, M3 Tap

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Fixed Lens Mounts with Internal Threads, 8-32 (M4) Tap

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View Imperial Product List

Item #	Qty	Description
Imperial Product List
CF125	1	Clamping Fork, 1.24" Counterbored Slot, Universal
BE1	1	Ø1.25" Studded Pedestal Base Adapter, 1/4"-20 Thread
PH2	1	Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 2"
TR1.5	1	Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 1.5"
LMR1	1	Lens Mount with Retaining Ring for Ø1" Optics, 8-32 Tap
SH25S050	1	1/4"-20 Stainless Steel Cap Screw, 1/2" Long, 25 Pack
W25S050	1	1/4" Washer, M6 Compatible, Stainless Steel, 100 Pack

View Metric Product List

Item #	Qty	Description
Metric Product List
CF125	1	Clamping Fork, 1.24" Counterbored Slot, Universal
BE1/M	1	Ø31.8 mm Studded Pedestal Base Adapter, M6 Thread
PH50/M	1	Ø12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=50 mm
TR40/M	1	Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 40 mm
LMR1/M	1	Lens Mount with Retaining Ring for Ø1" Optics, M4 Tap
SH6MS12	1	M6 x 1.0 Stainless Steel Cap Screw, 12 mm Long, 25 Pack
W25S050	1	1/4" Washer, M6 Compatible, Stainless Steel, 100 Pack

LMR1 Mounted on a Ø1/2" Post and Attached to an Aluminum Breadboard

Click to Enlarge
LMR1 Ø1" Mount Attached to a TPA01 Pitch-Adjustable Kinematic Adapter

Accommodates Various Optic Diameters from Ø5 mm to Ø4"
Internally Threaded
8-32 (M4) Tapped Hole Allows for Mounting to Ø1/2" Posts
Includes Compatible Retaining Ring for Mounting Optics
Ø1/2", Ø1", and Ø2" Optic Mounts Available in 5 Packs

These Fixed Optic Mounts are our standard mounts for 20 distinct optic diameters ranging from Ø5 mm to Ø4". Each mount features internal threading, and ships with a retaining ring for securing the optic into place. The internal threading is deep enough to hold most unmounted optics or externally threaded components. The base of each mount features an 8-32 (M4) tapped hole, which allows for easy mounting to Ø1/2" Posts, as shown to the right. Additional retaining rings are sold separately below.

Three of our most popular fixed optic mounts, the LMR05(/M), LMR1(/M), and LMR2(/M), are available individually and in packs of 5. 5-packs include one retaining ring per mount for a total of five rings.

Item #	Optic Diameter	Max Optic Thickness^a	Clear Aperture^b	Optical Height	Included Retaining Ring	Suggested Spanner Wrench	Suggested Spanner Bit
LMR5(/M)	Ø5 mm	0.13" (3.4 mm)	Ø0.15" (Ø3.8 mm)	0.50" (12.7 mm)	SM5RR	SPW205 or SPW801	-
LMR6(/M)	Ø6 mm	0.16" (4.0 mm)	Ø0.19" (Ø4.8 mm)	0.50" (12.7 mm)	SM6RR	SPW206 or SPW801	-
LMR7(/M)	Ø7 mm^c	0.16" (4.0 mm)	Ø0.23" (Ø5.8 mm)	0.50" (12.7 mm)	SM7RR	SPW207 or SPW801	-
LMR8(/M)	Ø8 mm^d	0.16" (4.0 mm)	Ø0.27" (Ø6.9 mm)	0.55" (14.0 mm)	SM8RR	SPW208 or SPW801	-
LMR9(/M)	Ø9 mm	0.16" (4.0 mm)	Ø0.31" (Ø7.9 mm)	0.55" (14.0 mm)	SM9RR	SPW209 or SPW801	-
LMR10(/M)	Ø10 mm	0.16" (4.0 mm)	Ø0.35" (Ø8.8 mm)	0.55" (14.0 mm)	SM10RR	SPW210 or SPW801	-
LMR05(/M)	Ø1/2"^e	0.21" (5.0 mm)	Ø0.44" (Ø11.0 mm)	0.63" (16.0 mm)	SM05RR	SPW603, SPW603L, or SPW801	SPB05
LMR15(/M)	Ø15 mm	0.30" (7.7 mm)	Ø0.50" (Ø12.7 mm)	0.70" (17.8 mm)	SM15RR	SPW801	-
LMR18(/M)	Ø18 mm	0.29" (7.4 mm)	Ø0.61" (Ø15.5 mm)	0.75" (19.1 mm)	SM18RR	SPW801	-
LMR20(/M)	Ø20 mm	0.29" (7.4 mm)	Ø0.68" (Ø17.3 mm)	0.82" (20.8 mm)	SM20RR	SPW801	-
LMR1(/M)	Ø1"	0.28" (7.1 mm)	Ø0.90" (Ø22.9 mm)	0.87" (22.1 mm)	SM1RR	SPW602 or SPW606	SPB1
LMR30(/M)	Ø30 mm	0.28" (7.1 mm)	Ø1.10" (Ø28.0 mm)	1.00" (25.4 mm)	SM30RR	SPW607
LMR1.5	Ø1.5"	0.36" (9.2 mm)	Ø1.37" (Ø34.8 mm)	1.13" (28.7 mm)	SM1.5RR	SPW608 or SPW801	SPB1.5
LMR1.5/M	Ø1.5"	0.36" (9.2 mm)	Ø1.38" (Ø34.9 mm)	1.13" (28.7 mm)	SM1.5RR	SPW608 or SPW801	SPB1.5
LMR40(/M)	Ø40 mm	0.36" (9.2 mm)	Ø1.47" (Ø37.5 mm)	1.30" (33.0 mm)	SM40RR	SPW801	-
LMR45(/M)	Ø45 mm	0.36" (9.2 mm)	Ø1.67" (Ø42.4 mm)	1.30" (33.0 mm)	SM45RR	SPW801	-
LMR2(/M)	Ø2"	0.36" (9.2 mm)	Ø1.90" (Ø48.5 mm)	1.35" (34.3 mm)	SM2RR	SPW604	SPB2
LMR75(/M)	Ø75 mm	0.30" (7.6 mm)	Ø2.81" (Ø71.4 mm)	2.00" (50.8 mm)	SM75RR	SPW801	-
LMR3(/M)	Ø3"	0.36" (9.2 mm)	Ø2.81" (Ø71.4 mm)	2.00" (50.8 mm)	SM3RR	SPW605	SPB3
LMR100(/M)	Ø100 mm	0.54" (13.7 mm)	Ø3.80" (Ø96.4 mm)	3.00" (76.2 mm)	SM100RR	-	-
LMR4(/M)	Ø4"	0.54" (13.7 mm)	Ø3.81" (Ø96.8 mm)	3.00" (76.2 mm)	SM4RR	-	-

This specification is true for thin lenses. For lenses with small focal lengths, and hence large lens curvatures, please contact Tech Support to ensure a proper fit.
This specification refers to the clear aperture of the retaining ring used to mount the optic.
The LMR7(/M) can also be used to secure Ø6.35 mm optics.
The LMR8(/M) can also be used to secure Ø7.40 mm optics.
The LMR05(/M) can also be used to secure Ø12.5 mm optics.

Based on your currency / country selection, your order will ship from Newton, New Jersey

+1 Qty Docs Part Number - Imperial Price Available

LMR5	Lens Mount with Retaining Ring for Ø5 mm Optics, 8-32 Tap

$19.41

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LMR6	Lens Mount with Retaining Ring for Ø6 mm Optics, 8-32 Tap

$19.70

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LMR7	Lens Mount with Retaining Ring for Ø7 mm Optics, 8-32 Tap

$19.98

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LMR8	Lens Mount with Retaining Ring for Ø8 mm Optics, 8-32 Tap

$20.27

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LMR9	Lens Mount with Retaining Ring for Ø9 mm Optics, 8-32 Tap

$20.56

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LMR10 Lens Mount with Retaining Ring for Ø10 mm Optics, 8-32 Tap

$20.83

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LMR05 Lens Mount with Retaining Ring for Ø1/2" Optics, 8-32 Tap

$16.99

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LMR05-P5 Lens Mount with Retaining Ring for Ø1/2" Optics, 8-32 Tap, 5 Pack

$80.70

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LMR15 Lens Mount with Retaining Ring for Ø15 mm Optics, 8-32 Tap

$25.04

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LMR18 Lens Mount with Retaining Ring for Ø18 mm Optics, 8-32 Tap

$27.48

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LMR20 Lens Mount with Retaining Ring for Ø20 mm Optics, 8-32 Tap

$30.00

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LMR1	Lens Mount with Retaining Ring for Ø1" Optics, 8-32 Tap

$16.47

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LMR1-P5 Lens Mount with Retaining Ring for Ø1" Optics, 8-32 Tap, 5 Pack

$78.19

Today

LMR30 Lens Mount with Retaining Ring for Ø30 mm Optics, 8-32 Tap

$33.19

Today

LMR1.5 Lens Mount with Retaining Ring for Ø1.5" Optics, 8-32 Tap

$27.95

Today

LMR40 Customer Inspired! Lens Mount with Retaining Ring for Ø40 mm Optics, 8-32 Tap

$36.54

Today

LMR45 Lens Mount with Retaining Ring for Ø45 mm Optics, 8-32 Tap

$37.57

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LMR2	Lens Mount with Retaining Ring for Ø2" Optics, 8-32 Tap

$29.41

Today

LMR2-P5 Lens Mount with Retaining Ring for Ø2" Optics, 8-32 Tap, 5 Pack

$139.65

Today

LMR75 Lens Mount with Retaining Ring for Ø75 mm Optics, 8-32 Tap

$61.14

Today

LMR3	Customer Inspired! Lens Mount with Retaining Ring for Ø3" Optics, 8-32 Tap

$61.14

Today

LMR100 Lens Mount with Retaining Ring for Ø100 mm Optics, 8-32 Tap

$75.11

Today

LMR4	Customer Inspired! Lens Mount with Retaining Ring for Ø4" Optics, 8-32 Tap

$75.11

Today

+1 Qty Docs Part Number - Metric Price Available

LMR5/M Lens Mount with Retaining Ring for Ø5 mm Optics, M4 Tap

$19.41

Today

LMR6/M Lens Mount with Retaining Ring for Ø6 mm Optics, M4 Tap

$19.70

Today

LMR7/M Lens Mount with Retaining Ring for Ø7 mm Optics, M4 Tap

$19.98

Today

LMR8/M Lens Mount with Retaining Ring for Ø8 mm Optics, M4 Tap

$20.27

Today

LMR9/M Lens Mount with Retaining Ring for Ø9 mm Optics, M4 Tap

$20.56

Today

LMR10/M Lens Mount with Retaining Ring for Ø10 mm Optics, M4 Tap

$20.83

Today

LMR05/M Lens Mount with Retaining Ring for Ø1/2" Optics, M4 Tap

$16.99

7-10 Days

LMR05/M-P5 Lens Mount with Retaining Ring for Ø1/2" Optics, M4 Tap, 5 Pack

$80.70

Today

LMR15/M Lens Mount with Retaining Ring for Ø15 mm Optics, M4 Tap

$25.04

Today

LMR18/M Lens Mount with Retaining Ring for Ø18 mm Optics, M4 Tap

$27.48

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LMR20/M Lens Mount with Retaining Ring for Ø20 mm Optics, M4 Tap

$30.00

Today

LMR1/M Lens Mount with Retaining Ring for Ø1" Optics, M4 Tap

$16.47

Today

LMR1/M-P5 Lens Mount with Retaining Ring for Ø1" Optics, M4 Tap, 5 Pack

$78.19

Today

LMR30/M Lens Mount with Retaining Ring for Ø30 mm Optics, M4 Tap

$33.19

Today

LMR1.5/M Lens Mount with Retaining Ring for Ø1.5" Optics, M4 Tap

$27.95

Today

LMR40/M Customer Inspired! Lens Mount with Retaining Ring for Ø40 mm Optics, M4 Tap

$36.54

Today

LMR45/M Lens Mount with Retaining Ring for Ø45 mm Optics, M4 Tap

$37.57

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LMR2/M Lens Mount with Retaining Ring for Ø2" Optics, M4 Tap

$29.41

7-10 Days

LMR2/M-P5 Lens Mount with Retaining Ring for Ø2" Optics, M4 Tap, 5 Pack

$139.65

Today

LMR75/M Lens Mount with Retaining Ring for Ø75 mm Optics, M4 Tap

$61.14

Today

LMR3/M Customer Inspired! Lens Mount with Retaining Ring for Ø3" Optics, M4 Tap

$61.14

7-10 Days

LMR100/M Lens Mount with Retaining Ring for Ø100 mm Optics, M4 Tap

$75.11

Today

LMR4/M Customer Inspired! Lens Mount with Retaining Ring for Ø4" Optics, M4 Tap

$75.11

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Vacuum-Compatible Fixed Lens Mounts with Internal Threads, 8-32 (M4) Tap

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Vacuum Specifications
Vacuum Compatibility as Packaged^a	>10^-6 Torr
Materials	6061-T6 Aluminum
Preparation and Packaging	Chemically Cleaned and Double Vacuum Bagged
Aluminum Outgassing Rate at 20 °C	7.6 x 10^-9 Torr-Liters/s/cm²

This is the pressure at which these components can be used with no additional processing. They can be used at even lower
pressures with additional cleaning and processing.

Constructed from Unanodized Aluminum for Vacuum Applications
Mount Optics With Included Vacuum-Compatible Retaining Ring
Mounting Hole is Vented to Allow Gas to Escape
8-32 (M4) Tapped Hole for Mounting to Vacuum-Compatible Ø1/2" Posts
Internally Threaded for Ø1/2", Ø1", or Ø2" Optics

These vacuum-compatible fixed lens mounts are fabricated from unanodized 6061-T6 aluminum and are suitable for vacuum chamber and clean room applications. Each of these fixed lens mounts features a hole in the back which is connected to the 8-32 (M4) tapped mounting hole on the base in order to serve as a vent, allowing trapped gas to escape when a vacuum chamber is pumped down. This vented mounting hole allows for easy integration with our vacuum-compatible Ø1/2" posts. Do not plug this vent hole or attempt to use it as a mounting point. These lens mounts are available for Ø1/2", Ø1", and Ø2" optics and each one is shipped with a vacuum-compatible retaining ring for securing an optic against the retention lip at the back of the mount.

Vacuum Compatibility
Our vacuum-compatible lens mounts are chemically cleaned and prepared for vacuum applications before packaging. They are compatible directly out of the packaging with vacuum environments down to 10^-6 Torr. With additional cleaning and processing, they can be used at even lower pressures, only limited by the outgassing rate of the aluminum (see the Vacuum Specifications table above). The material properties of the aluminum and the cleaning methods completed by the end user should be used to determine the appropriateness of these products and materials in a specific vacuum system.

Our vacuum-compatible lens mounts and included retaining rings are packaged in double airtight bags for cleanroom and vacuum chamber applications.

Item #	Optic Diameter	Max Optic Thickness^a	Clear Aperture^b	Optical Height	Replacement Retaining Ring^c	Suggested Spanner Wrench	Suggested Spanner Bit
LMR05V(/M)	Ø1/2"	0.21" (5.0 mm)	Ø0.44" (Ø11.0 mm)	0.63" (16.0 mm)	SM05RRV	SPW603, SPW603L, or SPW801	SPB05
LMR1V(/M)	Ø1"	0.28" (7.1 mm)	Ø0.90" (Ø22.9 mm)	0.87" (22.1 mm)	SM1RRV	SPW602, SPW606 or SPW801	SPB1
LMR2V(/M)	Ø2"	0.36" (9.2 mm)	Ø1.90" (Ø48.5 mm)	1.36" (34.4 mm)	SM2RRV	SPW604 or SPW801	SPB2

This specification is true for thin lenses. For lenses with small focal lengths, and hence large lens curvatures, please contact tech support to ensure a proper fit.
This specification is the clear aperture of the mount without a retaining ring.

Fixed Lens Mounts with Internal and External Threading

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Click to Enlarge

View Imperial Product List

Item #	Qty	Description
Imperial Product List
SM1D12C	1	SM1 Graduated Ring-Actuated Iris Diaphragm (Ø1 - Ø12 mm)
SM1L10	1	SM1 Lens Tube, 1.00" Thread Depth, One Retaining Ring Included
LMR1S	1	Ø1" Lens Mount with Internal and External SM1 Threads, 8-32 Tap
TR4	1	Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 4"

View Metric Product List

Item #	Qty	Description
Metric Product List
SM1D12C	1	SM1 Graduated Ring-Actuated Iris Diaphragm (Ø1 - Ø12 mm)
SM1L10	1	SM1 Lens Tube, 1.00" Thread Depth, One Retaining Ring Included
LMR1S/M	1	Ø1" Lens Mount with Internal and External SM1 Threads, M4 Tap
TR100/M	1	Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 100 mm

SM1D12C Iris Shown with an SM1L10 Lens Tube that Has Been Mounted to an LMR1S Mount

Fixed Mounts for Ø1/2", Ø1", and Ø2" Optics
Internal and External SM05, SM1, or SM2 Threads
8-32 (M4) Tapped Hole for Mounting to Ø1/2" Posts
Mount Lenses with Included SM-Threaded Retaining Ring
Add or Remove SM-Threaded Components without Losing Access to the Mounted Optic

These fixed lens mounts, which feature internal SM threading on one side and external SM threading on the other, are available for Ø1/2", Ø1", and Ø2" optics. The mount holds an optic securely with the included retaining ring and can be post mounted to a Ø1/2" Post.

The internal threading is deep enough to hold most unmounted optics, while the external threading is deep enough to mount lens tubes, irises, or other internally threaded SM components (see picture to the right). These mounts provide a compact solution to mount multiple SM-threaded components on a single post.

Item #	Optic Diameter	Max Optic Thickness^a	Clear Aperture^b	Optical Height	Included Retaining Ring	Suggested Spanner Wrench	Suggested Spanner Bit
LMR05S(/M)	Ø1/2"	0.21" (5 mm)	Ø0.43" (Ø10.9 mm)	0.63" (16.0 mm)	SM05RR	SPW603 or SPW603L	SPB05
LMR1S(/M)	Ø1"	0.28" (7.1 mm)	Ø0.90" (Ø22.9 mm)	0.87" (22.1 mm)	SM1RR	SPW602 or SPW606	SPB1
LMR2S(/M)	Ø2"	0.36" (9.1 mm)	Ø1.90" (Ø48.5 mm)	1.36" (34.5 mm)	SM2RR	SPW604	SPB2

This specification is true for thin lenses. For lenses with small focal lengths, and hence large lens curvatures, please contact Tech Support to ensure a proper fit.
This specification refers to the clear aperture of the retaining ring used to mount the optic.

Fixed Lens Mounts with No Retaining Lip

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Fixed Mounts for Ø1/2", Ø1", and Ø2" Optics
Internal SM05, SM1, or SM2 Threads
8-32 (M4) Tapped Hole for Mounting to Ø1/2" Posts
Mount Optics Using Two Retaining Rings (Sold Separately)
Mount Externally SM-Threaded Components on Either Side

These mounting rings feature internal SM05, SM1, or SM2 threading that extends the full length of the mount without any retaining lip. They are perfect for mounting lens tubes and mounted optics, and can also be used to hold unmounted optics when used with two retaining rings (sold separately below).

Item #	Optic Diameter	Max Optic Thickness^a	Clear Aperture^b	Optical Height	Compatible Retaining Ring (Not Included)	Suggested Spanner Wrench	Suggested Spanner Bit
SMR05(/M)	Ø1/2"	0.16" (4 mm)	Ø0.51" (Ø13.0 mm)	0.63" (16.0 mm)	SM05RR	SPW603 or SPW603L	SPB05
SMR1(/M)	Ø1"	0.24" (6.1 mm)	Ø1.01" (Ø25.6 mm)	0.87" (22.1 mm)	SM1RR	SPW602 or SPW606	SPB1
SMR2(/M)	Ø2"	0.30" (7.6 mm)	Ø2.01" (Ø51.0 mm)	1.35" (34.0 mm)	SM2RR	SPW604	SPB2

This specification is true for thin lenses. For lenses with small focal lengths, and hence large lens curvatures, please contact Tech Support to ensure a proper fit.
This specification is the clear aperture of the mount without a retaining ring.

Small Optic Adapters

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Click to Enlarge
LA1116 Lens Epoxied into an LMRA6 Adapter Using NOA61 Epoxy; the Mounted Lens Was Then Placed in the LMR05 Mount

Adapt Optics Ranging from Ø2 mm to Ø9 mm to Fit into SM05-Compatible Components
Adapt Ø10 mm Optics to Fit into an LMR18(/M) Fixed Lens Mount
Manufactured from Stainless Steel
Epoxy Reservoirs Enable Uniform Glue Bond with Optic

Thorlabs' small-optic mounting adapters are designed to mount non-standard optic sizes into Ø1/2" or Ø18 mm Mounts. Each stainless steel adapter includes two or three reservoirs next to the lens cell to secure the lens in place with General Purpose or UV Curing epoxy. Simply place a drop or two of adhesive into each reservoir located next to the lens in the adapter. We recommend using our NOA61 UV curing adhesive and MS403-10 epoxy syringe.

The Ø1/2" Optic Mounting Adapters featured below are compatible with our LMR05(/M) or MLH05(/M) Lens Mounts, SM05 Lens Tubes, or 16 mm Cage Components. The LMRA10 is compatible with our LMR18(/M) mount, AD18T adapter, or SM1AD18 adapter. Once the optic is secured in the small-optic adapter, the new assembly is held in one of these threaded mounts using an SM05RR or SM18RR Retaining Ring.

Thorlabs also offers an extensive line of adapters for unmounted optics which allow optics ranging from Ø2 mm to Ø2" to be mounted in our fixed optic mounts.

Item #	Optic Diameter		Clear Aperture	Outer Diameter	Thickness	Compatible Mounts
Item #	Typ.	Max	Clear Aperture	Outer Diameter	Thickness	Compatible Mounts
LMRA2	2 mm	2.05 mm	Ø1.8 mm (Ø0.07")	12.7 mm (1/2")	2.2 mm (0.09")	MLH05 Lens Mount LMR05 Lens Mount SM05 Lens Tubes 16 mm Cage Components
LMRA3	3 mm	3.05 mm	Ø2.4 mm (Ø0.11")
LMRA5	5 mm	5.05 mm	Ø3.8 mm (Ø0.15")
LMRA6	6 mm	6.07 mm	Ø4.8 mm (Ø0.19")
LMRA6.35	6.35 mm	6.4 mm	Ø5.4 mm (Ø0.21")
LMRA7	7 mm	7.03 mm	Ø6.0 mm (Ø0.24")
LMRA7.4	7.4 mm	7.41 mm	Ø6.4 mm (Ø0.25")
LMRA8	8 mm	8.02 mm	Ø7.0 mm (Ø0.28")
LMRA9	9 mm	9.01 mm	Ø7.9 mm (Ø0.31")
LMRA10	10 mm	10.03 mm	Ø8.8 mm (Ø0.35")	18 mm (0.71")	2.5 mm (0.10")	LMR18 Lens Mount AD18T Adapter SM1AD18 Adapter

Retaining Rings for Fixed Lens Mounts

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Threaded Rings for Securing Optics into Place
Made from Black Anodized Aluminum
SM05, SM1, and SM2 Threaded Rings Available in Multipacks

These Retaining Rings are replacements for those that are provided with our fixed lens mounts featured above. Two retaining rings are required for mounting optics in the fixed lens mounts with no retaining lip (item # SMRx). We also offer stress-free and plastic retaining rings for our Ø1.0" lens mounts, and retaining rings in additional sizes on our main Retaining Rings page.

For ordering convenience, our Ø1/2" and Ø1" Retaining Rings, the SM05RR and SM1RR, are available in packs of 10, and our Ø2" Retaining Ring, the SM2RR, is available in packs of 5.

Based on your currency / country selection, your order will ship from Newton, New Jersey

+1 Qty Docs Part Number - Universal Price Available

SM5RR M5.5 x 0.5 Retaining Ring for Ø5 mm Lens Mounts

$11.30

Today

SM6RR M6.5 x 0.5 Retaining Ring for Ø6 mm Lens Mounts

$11.30

Today

SM7RR M7.5 x 0.5 Retaining Ring for Ø7 mm Lens Mounts

$11.30

Today

SM8RR M8.5 x 0.5 Retaining Ring for Ø8 mm Lens Mounts

$11.30

Today

SM9RR M9.5 x 0.5 Retaining Ring for Ø9 mm Lens Mounts

$11.30

Today

SM10RR M10.5 x 0.5 Retaining Ring for Ø10 mm Lens Mounts

$11.30

Today

SM05RR SM05 Retaining Ring for Ø1/2" Lens Tubes and Mounts

$4.33

Today

SM05RR-P10 SM05 Retaining Ring for Ø1/2" Lens Tubes and Mounts, 10 Pack

$38.93

Today

SM15RR M15.5 x 0.5 Retaining Ring for Ø15 mm Lens Mounts

$11.30

Today

SM18RR 0.750"-40 Retaining Ring for Ø18 mm Lens Mounts

$11.30

Today

SM20RR M20.5 x 0.5 Retaining Ring for Ø20 mm Lens Mounts

$11.30

Today

SM1RR SM1 Retaining Ring for Ø1" Lens Tubes and Mounts

$4.87

Today

SM1RR-P10 SM1 Retaining Ring for Ø1" Lens Tubes and Mounts, 10 Pack

$43.81

Today

SM30RR SM30 Retaining Ring for Ø30 mm Lens Tubes and Mounts

$12.63

Today

SM1.5RR SM1.5 Retaining Ring for Ø1.5" Lens Tubes and Mounts

$11.30

Today

SM40RR M40.5 x 0.5 Retaining Ring

$14.33

Today

SM45RR M45.5 x 0.5 Retaining Ring for Ø45 mm Lens Mounts

$14.55

Today

SM2RR SM2 Retaining Ring for Ø2" Lens Tubes and Mounts

$7.47

Today

SM2RR-P5 SM2 Retaining Ring for Ø2" Lens Tubes and Mounts, 5 Pack

$33.58

Today

SM75RR M75.5 x 0.5 Retaining Ring for Ø75 mm Mounts

$16.59

Today

SM3RR SM3 Retaining Ring for Ø3" Lens Tubes and Mounts

$16.59

Today

SM100RR M100.75 x 0.5 Retaining Ring for Ø100 mm Mounts

$19.32

Today

SM4RR Customer Inspired! SM4 Retaining Ring for Ø4" Mounts

$19.32

Today

Lens Mount Alignment Plates

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Click to Enlarge
These alignment plates slide over the fixed lens mounts sold above to create a mounted alignment target.

Quick, Drop-In Visual Beam Alignment Tool
Ø1 mm Through Hole
Options for Fixed Lens Mounts Sold Above and SM Lens Tubes (See Compatibility Table below)

These alignment targets can be quickly and easily dropped onto one of our fixed lens holders or lens tubes allowing the user to align a visible beam using the center Ø1 mm through hole. Once the beam is aligned, the tool can be lifted from the lens holder or lens tube without disturbing the alignment and can later be replaced into approximately the same position.

For optimal visual alignment of the beam, these plates feature laser-engraved concentric circles, with the diameter of each circle being 2 mm greater than the previous.

Alignment Plate Item #	LMR05AP	LMR1AP	LMR30AP	LMR1.5AP	LMR2AP	LMR3AP	LMR4AP
Compatible Fixed Lens Mounts	MLH05(/M), LMR05(/M), LMR05V(/M)^a, MR05S(/M), SMR05(/M)	LMR1(/M), LMR1V(/M)^a, LMR1S(/M), SMR1(/M)	LMR30(/M)	LMR1.5(/M)	LMR2(/M), LMR2V(/M)^a, LMR2S(/M), SMR2(/M)	LMR3(/M), LMR75(/M)	LMR4(/M), LMR100(/M)
Compatible SM Lens Tubes	SM05	SM1	SM30	SM1.5	SM2	SM3	-

If interested in using alignment plates with our vacuum-compatible lens mounts, we can offer unanodized versions for any outgassing concerns. Contact Tech Support to request a quote.

Spanner Wrenches for Retaining Rings

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Item #	Compatible Retaining Rings	Feature	Length
SPW205	SM5RR	Stackable: One End of Spanner Wrench Fits to End of Other Spanner Wrench to Reach Retaining Rings in Longer Lens Tubes	1.00"
SPW206	SM6RR
SPW207	SM7RR
SPW208	SM8RR
SPW209	SM9RR
SPW210	SM10RR
SPW211	SM11RR
SPW603	SM05RR, SM05RRV, SM05RRC, SM05LTRR, SM05PRR, POLARIS-SM05RR
SPW603L	SM05RR, SM05RRV, SM05RRC, SM05LTRR, SM05PRR, POLARIS-SM05RR	Engraved Scale	3.88"
SPW606	SM1RR, SM1RRV, SM1RRC, SM1LTRR, POLARIS-SM1RR	-	1.00"
SPW602	SM1RR, SM1RRV, SM1RRC, SM1LTRR, POLARIS-SM1RR	Engraved Scale	3.88"
SPW607	SM30RR	-	4.35"
SPW608	SM1.5RR	Engraved Scale	3.88"
SPW604	SM2RR, SM2RRV, SM2RRC, SM2LTRR, POLARIS-SM2RR	-	4.35"
SPW605	SM3RR	-	4.35"

Individual Sizes for Standard Retaining Rings
Knurled Handle for Improved Grip
Stackable Spanner Wrenches for Reaching Retaining Rings in Longer Lens Tubes

These spanner wrenches enable adjustment or installation of many of our standard retaining rings. The hollow construction of each spanner wrench allows the retaining ring to be adjusted without obscuring the beam path. They feature knurled handles for improved grip as well as flanges to keep the retaining ring on the end of the spanner wrench while inserting or removing the ring.

As shown below, the SPW602, SPW603L, and SPW608 wrenches feature an engraved scale to indicate spanner wrench depth in both imperial and metric increments (0.02" and 0.5 mm, respectively), thereby enabling precise positioning of optics.

For retaining rings not covered by these cylindrical spanner wrenches, please see the SPW801 Adjustable Spanner Wrench sold at the bottom of the page. The SPW801 features an adjustable spanning range as well as long blades that extend 1.6" (40.7 mm) from the body of the wrench. Hence, for lenses with a high radius of curvature, we recommend using the SPW801 over the cylindrical spanner wrenches, whose guide flanges may come into contact with the lens.

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An SPW602 spanner wrench is used to place an optic in a lens tube via a retaining ring. This spanner wrench features an engraved scale to indicate spanner wrench depth.

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Stackable spanner wrenches, like the SPW603, can be fitted together to reach retaining rings in long lens tubes.

Based on your currency / country selection, your order will ship from Newton, New Jersey

+1 Qty Docs Part Number - Universal Price Available

SPW205 Spanner Wrench for SM5RR Retaining Rings, Length = 1.00"

$20.56

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SPW206 Spanner Wrench for SM6RR Retaining Rings, Length = 1.00"

$20.56

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SPW207 Spanner Wrench for SM7RR Retaining Rings, Length = 1.00"

$20.56

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SPW208 Spanner Wrench for SM8RR Retaining Rings, Length = 1.00"

$20.56

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SPW209 Spanner Wrench for SM9RR Retaining Rings, Length = 1.00"

$20.56

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SPW210 Spanner Wrench for SM10RR Retaining Rings, Length = 1.00"

$20.56

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SPW211 Spanner Wrench for SM11RR Retaining Rings, Length = 1.00"

$20.56

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SPW603 Spanner Wrench for SM05-Threaded Retaining Rings, Length = 1.00"

$27.98

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SPW603L Spanner Wrench for SM05-Threaded Retaining Rings, Graduated Scale with 0.02" (0.5 mm) Increments, Length = 3.88"

$64.58

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SPW606 Customer Inspired! Spanner Wrench for SM1-Threaded Retaining Rings, Length = 1.00"

$30.54

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SPW602 Spanner Wrench for SM1-Threaded Retaining Rings, Graduated Scale with 0.02" (0.5 mm) Increments, Length = 3.88"

$30.54

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SPW607 Customer Inspired! Spanner Wrench for SM30-Threaded Retaining Rings, Length = 4.35"

$46.82

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SPW608 Spanner Wrench for SM1.5-Threaded Retaining Rings, Graduated Scale with 0.02" (0.5 mm) Increments, Length = 3.88"

$64.58

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SPW604 Customer Inspired! Spanner Wrench for SM2-Threaded Retaining Rings, Length = 4.35"

$50.82

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SPW605 Spanner Wrench for SM3-Threaded Retaining Rings, Length = 4.35"

$89.36

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Spanner Bits for SM-Threaded Retaining Rings

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Spanner Bit and Torque Driver Application

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The spanner bits can be used with Thorlabs' TD24 Torque Driver, allowing a precise amount of torque to be applied. This is ideal for our SM-threaded Polaris™ Mirror Mounts, which have specific recommended mounting torques.

Bits Available for SM05, SM1, SM1.5, SM2, and SM3 Retaining Rings
Fits Any Standard 1/4" Hex Socket
Kit Offered with SM05, SM1, and SM2 Spanner Bits; Driver Handle with 1/4" Hex Socket; and Case

Spanner Bits allow SM-threaded retaining rings to be installed or adjusted without damaging optics that may be in place. They feature a standard 1/4" hex shank that allows them to be used with a manual driver handle, such as the one included in the kit below.

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The SPB600 Spanner Bit Kit Comes with a Handle with a 1/4" Hex Socket

Each bit includes guide flanges that prevent most optical elements from being scratched while the bit is being inserted. When using lenses with high curvature, we recommend the SPW801 Adjustable Spanner Wrench sold below, which uses long blades that prevent scratches caused by the guide flanges.

The SPB600 Spanner Wrench Bit Kit includes bits for SM05 (0.535"-40), SM1 (1.035"-40), and SM2 (2.035"-40) retaining rings; a driver handle with a 1/4" hex socket; and a carrying case. In addition, the case has a location to house the SM3 (3.035"-40) spanner bit available separately below.

If using these bits with a power drill, care should be taken to avoid overtightening the retaining ring due to the added torque created by the tool. Electric tools should be used at a low speed, and we recommend that the final tightening of the retaining ring be done by hand.

Adjustable Spanner Wrench

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Diameter Range from 0.12" to 2.89" (3.0 mm to 73.4 mm)
Self-Centering, One-Handed Diameter Adjustment Mechanism
Replaceable Stainless Steel Blades

Thorlabs' Adjustable Spanner Wrench features a spanning range that is continuously adjustable from 0.12" to 2.89" (3.0 mm to 73.4 mm). It is capable of providing an exact fit for retaining rings as large as the SM3RR for Ø3" Lens Tubes and Mounts. The diameter spanned by the blades remains centered while the knurled knob is adjusted.

The reversible blades have a flat tip on one end intended for use with retaining rings, and an edge-offset fine point on the opposing end for adapters with holes. The blades extend 1.6" (40.7 mm) from the body of the wrench. Hence, compared to our cylindrical spanner wrenches sold above, the SPW801 is ideal for securing lenses with a high radius of curvature because the guide flanges on the cylindrical spanner wrenches may come into contact with the lens. To reverse the blades, a 0.050" (1.3 mm) balldriver or hex key is needed. Replacement blade pairs are available separately.

The SPW801 wrench withstands a maximum torque of 80 inch-pounds (9 N·m).