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Products Home / Optomechanical Components / Optomechanical Mounts / Fixed Optic Mounts / Fixed Lens MountsFixed 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
Please Wait
Click to Enlarge
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)
Click to Enlarge
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 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, and spanner wrenches for easy optic installation.
Thorlabs' Threading Specifications
Thorlabs' lens tubes utilize a series of non-standard threadings. Threading specifications are given below for our SM threadings utilized in our lens tube and cage system components so that you can machine mating components to suit your application. We also offer products with C-Mount and RMS threadings, and the specifications for these threadings are also given below. Please note that other manufacturers may have different tolerances for these 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, M30.5x0.5 | Internal Thread, M30.5x0.5 | ||
| 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" |
| Posted Comments: | |
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 |
Zoom
Click for Details
MLH10 Mounted at 90° Using Right-Angle Adapter Post-Mounted to Aluminum Breadboard
- 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 Thicknessa |
Clear Apertureb | Optical Height | Included Retaining Ring |
Suggested Spanner Wrench |
|---|---|---|---|---|---|---|
| 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 mmc | 0.21" (5.3 mm) | Ø0.23" (Ø5.8 mm) | 0.39" (10 mm) | SM7RR | SPW207 or SPW801 |
| MLH8(/M) | Ø8 mmd | 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 | SPW211 or SPW801 |
Zoom
Click to Enlarge
LMR1 Mounted on a Ø1/2" Post and Attached to an Aluminum Breadboard
- 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 Thicknessa |
Clear Apertureb | Optical Height | Included Retaining Ring |
Suggested Spanner Wrench |
|---|---|---|---|---|---|---|
| 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 mmc | 0.16" (4.0 mm) | Ø0.23" (Ø5.8 mm) | 0.50" (12.7 mm) | SM7RR | SPW207 or SPW801 |
| LMR8(/M) | Ø8 mmd | 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 or SPW801 |
| 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" (Ø23.0 mm) | 0.87" (22.1 mm) | SM1RR | SPW602 or SPW606 |
| LMR30(/M) | Ø30 mm | 0.28" (7.1 mm) | Ø1.10" (Ø28.0 mm) | 1.00" (25.4 mm) | SM30RR | SPW607 |
| LMR1.5(/M) | Ø1.5" | 0.36" (9.2 mm) | Ø1.37" (Ø34.8 mm) | 1.13" (28.7 mm) | SM1.5RR | SPW801 |
| 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 |
| 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 |
| 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 | - |
Zoom| Vacuum Specifications | |
|---|---|
| Vacuum Compatibility as Packageda |
>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 |
- 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 Thicknessa |
Clear Apertureb | Optical Height | Replacement Retaining Ringc | Suggested Spanner Wrench |
|---|---|---|---|---|---|---|
| LMR05V(/M) | Ø1/2" | 0.21" (5.0 mm) | Ø0.44" (Ø11.0 mm) | 0.63" (16.0 mm) | SM05RRV | SPW603 or SPW801 |
| LMR1V(/M) | Ø1" | 0.28" (7.1 mm) | Ø0.90" (Ø23.0 mm) | 0.87" (22.1 mm) | SM1RRV | SPW602, SPW606 or SPW801 |
| LMR2V(/M) | Ø2" | 0.36" (9.2 mm) | Ø1.90" (Ø48.5 mm) | 1.36" (34.4 mm) | SM2RRV | SPW604 or SPW801 |
Zoom
Click to Enlarge 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 Thicknessa |
Clear Apertureb | Optical Height | Included Retaining Ring |
Suggested Spanner Wrench |
|---|---|---|---|---|---|---|
| LMR05S(/M) | Ø1/2" | 0.21" (5 mm) | Ø0.43" (Ø10.9 mm) | 0.63" (16.0 mm) | SM05RR | SPW603 |
| LMR1S(/M) | Ø1" | 0.28" (7.1 mm) | Ø0.90" (Ø23.0 mm) | 0.87" (22.1 mm) | SM1RR | SPW602 or SPW606 |
| LMR2S(/M) | Ø2" | 0.36" (9.1 mm) | Ø1.90" (Ø48.5 mm) | 1.36" (34.5 mm) | SM2RR | SPW604 |
Zoom- 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 Thicknessa |
Clear Apertureb | Optical Height | Compatible Retaining Ring (Not Included) |
Suggested Spanner Wrench |
|---|---|---|---|---|---|---|
| SMR05(/M) | Ø1/2" | 0.16" (4 mm) | Ø0.51" (Ø13.0 mm) | 0.63" (16.0 mm) | SM05RR | SPW603 |
| SMR1(/M) | Ø1" | 0.24" (6.1 mm) | Ø1.01" (Ø25.6 mm) | 0.87" (22.1 mm) | SM1RR | SPW602 or SPW606 |
| SMR2(/M) | Ø2" | 0.30" (7.6 mm) | Ø2.01" (Ø51.0 mm) | 1.35" (34.0 mm) | SM2RR | SPW604 |
Zoom
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 (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 (LMR05/M) or MLH05 (MLH05/M) Lens Mounts, SM05 Lens Tubes, or 16 mm Cage Components. The LMRA10 is compatible with our LMR18 (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 |
|
|---|---|---|---|---|---|---|
| Typ. | Max | |||||
| 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 |
Zoom- 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.
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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 Ø1/2", Ø1", or Ø2" Fixed Optics Mounts and SM05, SM1, or SM2 Series Lens Tubes
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.
The LMR05AP, LMR1AP, and LMR2AP Alignment Plates fit on fixed lens mounts and lens tubes for Ø1/2", Ø1", and Ø2" optics, respectively. 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.
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Click to Enlarge
Stackable spanner wrenches, like the SPW603, can be fitted together to reach retaining rings in long lens tubes.
Click to Enlarge
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.
- 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 to the right, the SPW602 features an engraved scale to indicate spanner wrench depth in both imperial and metric increments (0.1" 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.
| Item # | SPW205 | SPW206 | SPW207 | SPW208 | SPW209 | SPW210 | SPW211 | SPW603 | SPW606 | SPW602 | SPW607 | SPW604 | SPW605 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Compatible Retaining Rings |
SM5RR | SM6RR | SM7RR | SM8RR | SM9RR | SM10RR | SM11RR | SM05RR, SM05RRV, SM05RRC, SM05LTRR, SM05PRR, POLARIS-SM05RR |
SM1RR, SM1RRV, SM1RRC, SM1LTRR, POLARIS-SM1RR |
SM1RR, SM1RRV, SM1RRC, SM1LTRR, POLARIS-SM1RR |
SM30RR | SM2RR, SM2RRV, SM2RRC, SM2LTRR, POLARIS-SM2RR |
SM3RR |
| Feature | Stackable: One End of Spanner Wrench Fits to End of Other Spanner Wrench to Reach Retaining Rings in Longer Lens Tubes |
- | Engraved Scale | - | - | - | |||||||
| Length | 1.00" | 1.00" | 1.00" | 1.00" | 1.00" | 1.00" | 1.00" | 1.00" | 1.00" | 3.88" | 4.35" | 4.35" | 4.35" |
Zoom- 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).
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