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Ø1" Lens Tubes


  • Lens Tubes Accept Ø1" (Ø25.4 mm) Optics
  • SM1 Thread Standard Used Throughout Thorlabs' Product Line
  • Designed for Use with Our 30 mm Cage Systems

SM1M10

Internal Threads

SM1S20

External Threads

SM1L05

Internal and External Threads

SM1L40

Internal and External Threads

SM1L03

Internal and External Threads

SM1L10E

Internal Threads, Optic Retention Lip

SM1L30C

Slotted Lens Tube
(Optic Not Included)

Related Items


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Shelf Lower Configuration
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Lens tubes of different diameters can be combined using our thread adapters.
Lens Tube Engraving
Click to Enlarge

When an engraved lens tube is attached to another lens tube, the engraving of the connected end is no longer visible.

Features

  • Variety of Lens Tubes in Lengths from 0.30" (7.6 mm) to 4.00" (101.6 mm)
    • Standard Lens Tubes
    • Lens Tubes without External Threading
    • Lens Tubes with Optic Retention and No External Threading
    • Lens Tube Spacers without Internal Threading
    • Slotted Lens Tubes for Access to Optics without Disassembly
  • Extension Tube for Optics with Long Focal Lengths
  • Wide Range of SM1-Compatible Optomechanical Components
  • Compatible with Our 30 mm Cage Systems
  • Lens Tubes Directly Accept Ø1" (Ø25.4 mm) Optics

Lens tubes are ideal for creating compact optical subassemblies with light-tight beam paths. The Ø1" lens tubes sold here can be used to house one or several optical elements, as shown in the diagram of a beam expander below. In addition to the Ø1" lens tubes featured on this page, Thorlabs also offers Ø1/2", Ø30 mm, Ø2", and Ø3" versions, each of which is equipped with an SM series thread standard that depends on the tube diameter.

Optics are separated and secured by retaining rings that are positioned along the length of the lens tube using a compatible SM1 spanner wrench, sold below. Each of the lens tubes on this page come with one or two compatible SM-threaded retaining rings with the exception of the internally unthreaded lens tube spacers (Item #s beginning with SM1M). In addition, Thorlabs offers stress-free and plastic retaining rings for optics which require reduced stress on our SM-Threaded Retaining Rings page. 

Lens Tube Application Example
Lens Tube Compatible Products
Thread Adapters Terminated Fiber Adapters Collimation Package Adapters LED Mounts LD Mounts Aspheric Lens Mounts Irises, Apertures, and Shutters Alignment Tools

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 LensesCCD/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
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"

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Posted Comments:
Poster:lukasz.dziechciarczyk
Posted Date:2016-07-25 06:50:31.153
Dear Sir or Madame, Is there a lens tube like SM1L05 but with a locking screw going through it that could hold a custom piece inside (unthreaded) ? Lukasz
Poster:aklossek
Posted Date:2015-10-29 09:30:05.75
Dear ladies and gentlemen, I'm interested in using the SM1S10 lens tube. Do I understand auto CAD pdf correctly by seeing that the thread is not complete along to the thread range? This may cause that components with thin thread (e.g. CM1-DCH) rotate freely. Best regards André Klossek
Poster:besembeson
Posted Date:2015-10-29 02:55:33.0
Response from Bweh at Thorlabs USA: Yes the thread is not complete but it will not cause free rotation. The un-threaded space on the SM1S10 is 0.38mm while the threaded region of the CM1-DCH is about 2.03mm so you should still have at least 2 threads that will lock the two together.
Poster:ludoangot
Posted Date:2015-08-03 14:01:00.307
Hello, 1.5" long tubes would be much welcomed, I have a 1" thick lens element which doesn't fit in your 1" tubes but 2" is too long for my setup! Could you offer these in both SM1Lxx and SM1Mxx line?
Poster:besembeson
Posted Date:2015-08-19 11:54:55.0
Response from Bweh at Thorlabs USA: Thanks for your feedback. We can offer this to you as a special item for now. I will follow up by email. We will review this as a possible expansion to the lens tube stock product line.
Poster:cbrideau
Posted Date:2015-07-29 11:45:51.027
I'd like to see an extension tube like this made available for the SM30 line, and I'd also like to see a 12" length of this in the SM1 and SM30 for really long builds.
Poster:besembeson
Posted Date:2015-09-23 07:32:18.0
Response from Bweh at Thorlabs USA: We can provide this to you as a special item if needed. For now, you could use various combinations of the SM30 lens tubes to achieve your desired length or two SM1E60 of the SM1 extension.
Poster:u.eisenbarth
Posted Date:2014-02-17 14:55:25.57
Dear Madam / Sir, We are regularly using the SM tube system and are quite happy with it. However since we also use many custom parts which we want to connect to the SM standard it would be desireable if you would offer a corresponding thread cutter (for both internal and external threads). While our workshop can produce this type of (non-standard) thread on their turning machines it would make life much easier. Regards, Udo Eisenbarth
Poster:cdaly
Posted Date:2014-02-25 05:52:19.0
Response from Chris at Thorlabs: Thank you for your inquiry. We do have SM05 and SM1 taps to produce internal threads available at the linke below. At the moment, we do not offer these dies as standard items, but we can offer them as customs for the time being. Inquiries for these should be directed to techsupport@thorlabs.com We will contact you directly with this information. http://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=1189
Poster:sharrell
Posted Date:2012-03-30 14:26:00.0
A response from Sean at Thorlabs: Thank you again for your feedback on our lens tube covers. Several of our engineers have had sucess cutting the SC1L24 covers with a band saw or a coping saw. We have added this information to the website as a suggestion to future customers. In addition, one of our engineers tried using a pipe cutter and unfortunately, the tube was crushed.
Poster:tcohen
Posted Date:2012-03-29 14:14:00.0
Response from Tim at Thorlabs: One of our target specifications for this product was for it to be easy to cut. We are grateful to hear your feedback on this so we can improve the design. I am talking to our engineers to see if we can offer this with reduced thickness or if we can provide a tool for clean cutting. Thank you for your feedback!
Poster:
Posted Date:2012-03-29 10:58:43.0
The SC1L24 lens tube cover requires a power tool to cut, can you please consider adding a thin tube that could be cut more easily. Alternatively, provide some sort of jig that would allow the tube to be cut, i'm thinking a pipe cutter like gizmo. Thanks for listening, you guys are great!
Poster:bdada
Posted Date:2011-06-24 11:41:00.0
Response from Buki at Thorlabs: Thank you for your feedback. We have listed more details about our SMx series threads on our website. Please use the link below and click on the "Threading Specs" tab. http://www.thorlabs.com/NewGroupPage9.cfmObjectGroup_ID=3307&pn=SM1L03#3388 If you have any questions, please contact TechSupport@thorlabs.com
Poster:jon.hackett
Posted Date:2011-06-24 10:23:11.0
I see below that you have emailed the details of the SM1 thread form to others, can you please send me the details of this and the SM05, as I am designing parts to mate with them? Thanks. Customer Email: jon.hackett@ametek.co.uk This customer would like to be contacted.
Poster:jjurado
Posted Date:2011-06-23 18:10:00.0
Response from Javier at Thorlabs to nkad: Thank you very much for contacting us. We offer a few SM1 couplers which consist of external SM1 threads throughout the entire length of the tube. However, keep in mind that the internal diameter of these couplers is 24.0 mm, as it is not possible to have a tube with both internal and external SM1 threads along the section of the tube. Please take a look at the following link for our SM1 couplers with external threads and our adjustable lens tubes: SM1 lens tube couplers with external threads: http://www.thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=2704 Adjustable SM1 lens tubes: http://www.thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=4109 I will contact you directly to get a better understanding of your application.
Poster:nkad
Posted Date:2011-06-22 21:56:14.0
Do you have an SM1 tube with external threads along the whole length of the tube? This would permit infinite length adjustment for optics fixed at one end, especially when coupled with Lens Tubes Without External Threads. Customer Email: nkad@essex.ac.uk This customer would like to be contacted.
Poster:Greg
Posted Date:2011-01-13 08:31:48.0
A response from Greg at Thorlabs to mr.keith: Thank you for contacting us! I have e-mailed you the specifications of our SM1 threading.
Poster:Thorlabs
Posted Date:2010-09-02 13:52:28.0
Response from Javier at Thorlabs to driall: I will send you an e-mail with the complete specifications for the SM1 thread shortly.
Poster:driall
Posted Date:2010-09-02 11:34:31.0
i have a question on the SM1 threads: 1.035" - 40 does not define thread class, tooth profile. What is the full thread callout? im designing a part to mate with one of these tubes, and id like more info. Thanks, Dan

Ø1" Stackable Lens Tubes

  • Stackable Design Enables Multi-Element Optical Systems
  • SM1-Threaded (1.035"-40) Bore Accepts Ø1" (Ø25.4 mm) Optics
  • Compatible with Our 30 mm Cage Systems
  • 0.30", 0.50", 1.00", and 2.00" Lengths Available in Packs of 5

These stackable Ø1" lens tubes provide a fast and easy means for building compact optical assemblies. Their stackable design and direct interfacing with any SM1-threaded (1.035"-40) components provide flexibility for complex optomechanical assemblies. One SM1RR Retaining Ring is included with each lens tube.

For convenience, four of our most popular SM1 lens tube sizes are also available in packs of 5. Each pack of 5 includes one retaining ring per lens tube for a total of five rings.

SM1Lxx Lens Tube Diagram
Item # L1 L2 Thread Depth
SM1L03 0.45" (11.4 mm) 0.12" (3.0 mm) 0.30" (7.6 mm)
SM1L05 0.65" (16.5 mm) 0.50" (12.7 mm)
SM1L10 1.15" (29.2 mm) 1.00" (25.4 mm)
SM1L15 1.65" (41.9 mm) 1.50" (38.1 mm)
SM1L20 2.15" (54.6 mm) 2.00" (50.8 mm)
SM1L25 2.65" (67.3 mm) 2.50" (63.5 mm)
SM1L30 3.15" (80.0 mm) 3.00" (76.2 mm)
SM1L35 3.65" (92.7 mm) 3.50" (88.9 mm)
SM1L40 4.15" (105.4 mm) 4.00" (101.6 mm)

Alternatives Ø1/2", Ø30 mm, Ø2", and Ø3" Stackable Lens Tubes
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
SM1L03 Support Documentation
SM1L03SM1 Lens Tube, 0.30" Thread Depth, One Retaining Ring Included
$12.16
Today
SM1L03-P5 Support Documentation
SM1L03-P5SM1 Lens Tube, 0.30" Thread Depth, SM1RR Retaining Ring, 5 Pack
$57.75
Today
SM1L05 Support Documentation
SM1L05SM1 Lens Tube, 0.50" Thread Depth, One Retaining Ring Included
$12.59
Today
SM1L05-P5 Support Documentation
SM1L05-P5SM1 Lens Tube, 0.50" Thread Depth, SM1RR Retaining Ring, 5 Pack
$59.80
Today
SM1L10 Support Documentation
SM1L10SM1 Lens Tube, 1.00" Thread Depth, One Retaining Ring Included
$14.25
Today
SM1L10-P5 Support Documentation
SM1L10-P5SM1 Lens Tube, 1.00" Thread Depth, SM1RR Retaining Ring, 5 Pack
$67.70
Today
SM1L15 Support Documentation
SM1L15SM1 Lens Tube, 1.50" Thread Depth, One Retaining Ring Included
$15.30
Today
SM1L20 Support Documentation
SM1L20SM1 Lens Tube, 2.00" Thread Depth, One Retaining Ring Included
$16.50
Today
SM1L20-P5 Support Documentation
SM1L20-P5SM1 Lens Tube, 2.00" Thread Depth, SM1RR Retaining Ring, 5 Pack
$78.40
Today
SM1L25 Support Documentation
SM1L25SM1 Lens Tube, 2.50" Thread Depth, One Retaining Ring Included
$20.21
Today
SM1L30 Support Documentation
SM1L30SM1 Lens Tube, 3.00" Thread Depth, One Retaining Ring Included
$25.75
Today
SM1L35 Support Documentation
SM1L35SM1 Lens Tube, 3.50" Thread Depth, One Retaining Ring Included
$35.91
Today
SM1L40 Support Documentation
SM1L40SM1 Lens Tube, 4.00" Thread Depth, One Retaining Ring Included
$44.00
Today

Ø1" Lens Tubes Without External Threads

SM1Mxx Lens Tube Diagram
  • Unlike Stackable Lens Tubes, Optics can be Accessed from Both Ends
  • SM1-Threaded (1.035"-40) Bore Accepts Ø1" (Ø25.4 mm) Optics
  • Use Lens Tube Couplers to Stack Multiple Lens Tubes
  • Allows Coupling of Two Externally SM1-Threaded Components

Unlike our Ø1" stackable lens tubes featured above, these internally threaded lens tubes do not feature a lip at one end nor do they have external SM1 threading. Therefore, optics housed inside can be accessed from both ends. To join these lens tubes end-to-end, use a Lens Tube Coupler. Two SM1RR Retaining Rings are included with each lens tube.

Alternatives Ø1/2" and Ø2" Lens Tubes Without External Threads
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
SM1M05 Support Documentation
SM1M05Customer Inspired!SM1 Lens Tube Without External Threads, 1/2" Long, Two Retaining Rings Included
$12.00
Today
SM1M10 Support Documentation
SM1M10Customer Inspired!SM1 Lens Tube Without External Threads, 1" Long, Two Retaining Rings Included
$13.25
Today
SM1M15 Support Documentation
SM1M15SM1 Lens Tube Without External Threads, 1.5" Long, Two Retaining Rings Included
$15.50
Today
SM1M20 Support Documentation
SM1M20Customer Inspired!SM1 Lens Tube Without External Threads, 2" Long, Two Retaining Rings Included
$15.50
Today
SM1M25 Support Documentation
SM1M25SM1 Lens Tube Without External Threads, 2.5" Long, Two Retaining Rings Included
$16.74
Today
SM1M30 Support Documentation
SM1M30Customer Inspired!SM1 Lens Tube Without External Threads, 3" Long, Two Retaining Rings Included
$16.75
Today
SM1M35 Support Documentation
SM1M35SM1 Lens Tube Without External Threads, 3.5" Long, Two Retaining Rings Included
$26.75
Today

Ø1" Lens Tubes Without External Threads, Optic Retention Lip

SM1LxxE Lens Tube Diagram
Item #LThread Depth
SM1L05E 0.54"
(13.7 mm)
0.50"
(12.7 mm)
SM1L10E 1.04"
(26.4 mm)
1.00"
(25.4 mm)
  • Internal SM1 Threading (1.035"-40) with Optic Retention Lip at One End
  • Quickly Add and Remove Optics from Ø1" Lens Tube Assemblies
  • 1/2" (12.7 mm) and 1" (25.4 mm) Thread Depths Available
  • Ø0.90" (Ø22.9 mm) Clear Aperture

These lens tubes feature internal SM1 threading on one end and a retaining lip for holding optics on the other. They allow optics to be quickly added to any externally SM1-threaded components. The SM1L05E is 1/2" (12.7 mm) long and can hold optics up to 0.3" (8 mm) thick, while the SM1L10E is 1" (25.4 mm) long and can hold optics up to 0.8" (20 mm) thick. Each segment includes an SM1RR retaining ring for securing the optic into place. The retaining ring provides a clear aperture of Ø0.90" (Ø22.9 mm) through the lens tube.

These lens tubes are engraved with their respective part number at the end, as shown in the image to the left. This engraving is hidden when the lens tubes are combined with other SM1-threaded components. 

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
SM1L05E Support Documentation
SM1L05ECustomer Inspired!SM1 Lens Tube Without External Threads, Optic Retention Lip, 1/2" Thread Depth, One Retaining Ring Included
$12.00
Today
SM1L10E Support Documentation
SM1L10ECustomer Inspired!SM1 Lens Tube Without External Threads, Optic Retention Lip, 1" Thread Depth, One Retaining Ring Included
$13.75
Today

Ø1" Lens Tube Spacers Without Internal Threads

SM1Sxx Lens Tube Diagram
  • Use as Spacers Between Lens Tubes
  • External SM1 Threading (1.035"-40) on Each End
  • Ø0.95" (Ø24.0 mm) Clear Aperture
  • Lengths Ranging from 1.0" (25.4 mm) to 3.5" (88.9 mm)

These Lens Tube Spacers are designed to connect two components with internal SM1 threads at a fixed distance. They are internally unthreaded and have a clear aperture of Ø0.95" (Ø24.0 mm).

Please note that due to the fixed thread depth of 0.12" (3.0 mm), the orientation of the attached components will be arbitrary. For full control over the component orientation, Thorlabs offers Lens Tube Couplers with adjustable locking rings.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
SM1S10 Support Documentation
SM1S10Customer Inspired!SM1 Lens Tube Spacer, 1" Long
$12.00
Today
SM1S15 Support Documentation
SM1S15SM1 Lens Tube Spacer, 1.5" Long
$14.00
Today
SM1S20 Support Documentation
SM1S20Customer Inspired!SM1 Lens Tube Spacer, 2" Long
$14.00
Today
SM1S25 Support Documentation
SM1S25SM1 Lens Tube Spacer, 2.5" Long
$20.00
Today
SM1S30 Support Documentation
SM1S30Customer Inspired!SM1 Lens Tube Spacer, 3" Long
$20.00
Today
SM1S35 Support Documentation
SM1S35SM1 Lens Tube Spacer, 3.5" Long
$23.13
Today

Ø1" Slotted Lens Tube

Slotted Lens Tube
Click to Enlarge

The dust cover can be opened or closed by rotating it in either direction.
  • Easy Access to Optics
  • Rotatable Slip Shield Protects Optics
  • Compatible with SM1-Threaded (1.035"-40) Components
  • Available in 2" (50.8 mm) and 3" (76.2 mm) Thread Depths

These stackable Ø1" lens tubes with side slots provide a fast and easy means for building complex optical assemblies and adjusting the optics without disassembling the setup. Optics can be inserted into the tube and locked into position using the included SM1RR retaining rings. Simply thread the first retaining ring to the desired depth, add the optic, and then use a second retaining ring to secure the optic. Optics can be manually adjusted via the side slots without the use of a spanner wrench. The rotatable slip shield included with the lens tube has an inner diameter of 1.21" (31.0 mm) and fits over the lens tube slots to prevent unwanted light from entering the system and to keep the optical setup free from debris.

Alternatives Ø1/2" and Ø2" Slotted Lens Tubes
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
SM1L20C Support Documentation
SM1L20CSM1 Slotted Lens Tube, 2" Thread Depth, 2 Retaining Rings Included
$60.00
3-5 Days
SM1L30C Support Documentation
SM1L30CSM1 Slotted Lens Tube, 3" Thread Depth, 2 Retaining Rings Included
$65.00
Today

Ø1" Extension Tubes

SM1E60 Diagram
  • Extra-Long 6" (152.4 mm) Tube for Optics with Large Focal Lengths
  • 1.00" (25.4 mm) Long, SM1-Threaded (1.035"-40) Bore Accepts Ø1" (Ø25.4 mm) Optics
  • Compatible with 30 mm Cage Systems

The SM1E60 6" Long Extension Tube is designed to enable longer distances between optical components in lens tube systems that utilize lenses with large focal lengths. This tube features thicker walls than our standard lens tubes while maintaining the same outer diameter, which leads to greater rigidity. 

Alternatives Ø2" Extension Tubes
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
SM1E60 Support Documentation
SM1E60SM1 Extension Tube, 6" Long, 1" Thread Depth, One Retaining Ring Included
$44.00
Today

Ø1" Retaining Rings and Spanner Wrenches

Spanner Wrench Application
Click to Enlarge

Spanner Wrench Usage
  • SM1RR Retaining Rings Secure Ø1" Optics
  • SM1LTRR Retaining Rings Provide Stress-Free, Light-Tight Mounting of Ø1" Components
  • SM1PRR Plastic Retaining Rings are Stronger than Other Retaining Rings Due to Increased Thickness
  • Spanner Wrenches Provide One-Handed Adjustment of Retaining Rings
  • SPW801 Adjustable Spanner Wrench can Accommodate Diameters from 0.12" (3.0 mm) to 2.89" (73.4 mm)
  • SPB1 Spanner Bit for Use with 1/4" Hex Socket

Retaining Rings
Thorlabs offers three different kinds of SM1 retaining rings. The SM1RR is our standard retaining ring that ships with our Ø1" lens tubes as well as many other Thorlabs components, and is available individually or in packs of 10.

If desirable, the SM1RR can be swapped out for am SM1LTRR or an SM1PRR. The SM1LTRR is a stressless retaining ring that is equipped with a Buna-N O-ring to provide a light-tight seal around the optical component. The SM1PRR, on the other hand, is a plastic retaining ring that provides increased strength due to its increased thickness of 0.11" (2.8 mm) compared to 0.08" (2 mm) for our other Ø1" retaining rings. Please keep in mind that due to the increased thickness of the SM1PRR retaining ring, the maximum optic thickness that can be housed inside our standard SM1-compatible mounts will be diminished in some cases.

Spanner Wrenches
Thorlabs also offers several spanner wrench choices. The 1" long SPW606 and the 3.87" long SPW602 can be used with the SM1RR and SM1LTRR retaining rings, while the adjustable SPW801 can be used with all three types of SM1 retaining rings. These spanner wrenches can be inserted into the lens tube, as shown to the right, and are hollow to prevent obstruction of the beam path. The SPB1 spanner bit is an alternative to these that can be used with a standard 1/4" hex driver (sold separately).  

Alternatives Ø1/2", Ø2", and Ø3" Fixed Diameter Spanner Wrenches Ø1/2", Ø2", and Ø3" Retaining Rings
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
SM1RR Support Documentation
SM1RRSM1 Retaining Ring for Ø1" Lens Tubes and Mounts
$4.50
Today
SM1RR-P10 Support Documentation
SM1RR-P10SM1 Retaining Ring for Ø1" Lens Tubes and Mounts, 10 Pack
$40.50
Today
SM1LTRR Support Documentation
SM1LTRRSM1 Series Stress-Free Retaining Ring
$21.40
Today
SM1PRR Support Documentation
SM1PRRCustomer Inspired!SM1 Plastic Retaining Ring for Ø1" Lens Tubes and Mounts
$5.30
Today
SPW606 Support Documentation
SPW606Customer Inspired!SM1 Spanner Wrench, Length = 1"
$26.00
Today
SPW602 Support Documentation
SPW602SM1 Spanner Wrench, Graduated, Length = 3.88"
$26.00
Today
SPW801 Support Documentation
SPW801Adjustable Spanner Wrench
$95.90
Today
SPW102 Support Documentation
SPW102Adjustable Spanner Wrench, Replacement Blade Set
$27.90
Today
SPB1 Support Documentation
SPB1SM1 Spanner Bit
$38.00
Today
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