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

Related Items


Please Wait
Fixed Lens Mounts
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)
Fixed Lens Mounts
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 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
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

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

LMR1 with ZnSe lens mounted in 1/2" postClick for Details
View Imperial Product List
Item #QtyDescription
Imperial Product List
MLH101Mini-Series Lens Mount with Retaining Ring for Ø10 mm Optics, 4-40 Tap
AL108-B1Ø10 mm S-LAH64 Aspheric Lens, f=8 mm, NA=0.55, ARC: 650-1050 nm
MSRA901Mini-Post Right-Angle Post Clamp, Fixed 90° Adapter
MS2R2Mini-Series Optical Post, Ø6 mm, L = 2"
MPH501Pedestal-Base Mini-Series Post Holder with Flexure Clamp, 50 mm (1.97") Tall
MBA11Mini-Series Pedestal Post Holder Base, #8 (M4) Slot
MSB12112" x 12" x 3/8" Mini-Series Aluminum Breadboard, 8-32 and 1/4"-20 High-Density Taps
View Metric Product List
Item #QtyDescription
Metric Product List
MLH10/M1Mini-Series Lens Mount with Retaining Ring for Ø10 mm Optics, M3 Tap
AL108-B1Ø10 mm S-LAH64 Aspheric Lens, f=8 mm, NA=0.55, ARC: 650-1050 nm
MSRA901Mini-Post Right-Angle Post Clamp, Fixed 90° Adapter
MS2R/M1Mini-Series Optical Post, Ø6 mm, L = 50 mm
MPH501Pedestal-Base Mini-Series Post Holder with Flexure Clamp, 50 mm (1.97") Tall
MBA11Mini-Series Pedestal Post Holder Base, #8 (M4) Slot
MS12B/M1300 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
Mini Series Lens Mount
Click to Enlarge

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
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
  • 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  
+1 Qty Docs Part Number - Imperial Price Available
MLH5 Support Documentation
MLH5Customer Inspired! Mini-Series Lens Mount with Retaining Ring for Ø5 mm Optics, 4-40 Tap
$31.42
Today
MLH6 Support Documentation
MLH6Customer Inspired! Mini-Series Lens Mount with Retaining Ring for Ø6 mm Optics, 4-40 Tap
$37.38
Today
MLH7 Support Documentation
MLH7Customer Inspired! Mini-Series Lens Mount with Retaining Ring for Ø7 mm Optics, 4-40 Tap
$36.89
Today
MLH8 Support Documentation
MLH8Customer Inspired! Mini-Series Lens Mount with Retaining Ring for Ø8 mm Optics, 4-40 Tap
$37.00
Today
MLH9 Support Documentation
MLH9Customer Inspired! Mini-Series Lens Mount with Retaining Ring for Ø9 mm Optics, 4-40 Tap
$37.53
Today
MLH10 Support Documentation
MLH10Customer Inspired! Mini-Series Lens Mount with Retaining Ring for Ø10 mm Optics, 4-40 Tap
$36.96
Today
MLH05 Support Documentation
MLH05Customer Inspired! Mini-Series Lens Mount with Retaining Ring for Ø1/2" Optics, 4-40 Tap
$31.42
Today
+1 Qty Docs Part Number - Metric Price Available
MLH5/M Support Documentation
MLH5/MCustomer Inspired! Mini-Series Lens Mount with Retaining Ring for Ø5 mm Optics, M3 Tap
$31.42
Today
MLH6/M Support Documentation
MLH6/MCustomer Inspired! Mini-Series Lens Mount with Retaining Ring for Ø6 mm Optics, M3 Tap
$37.38
Today
MLH7/M Support Documentation
MLH7/MCustomer Inspired! Mini-Series Lens Mount with Retaining Ring for Ø7 mm Optics, M3 Tap
$36.89
Today
MLH8/M Support Documentation
MLH8/MCustomer Inspired! Mini-Series Lens Mount with Retaining Ring for Ø8 mm Optics, M3 Tap
$37.00
Today
MLH9/M Support Documentation
MLH9/MCustomer Inspired! Mini-Series Lens Mount with Retaining Ring for Ø9 mm Optics, M3 Tap
$37.53
Today
MLH10/M Support Documentation
MLH10/MCustomer Inspired! Mini-Series Lens Mount with Retaining Ring for Ø10 mm Optics, M3 Tap
$36.96
Today
MLH05/M Support Documentation
MLH05/MCustomer Inspired! Mini-Series Lens Mount with Retaining Ring for Ø1/2" Optics, M3 Tap
$31.42
Today

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

LMR1 with ZnSe lens mounted in 1/2" postClick to Enlarge
View Imperial Product List
Item #QtyDescription
Imperial Product List
CF1251Clamping Fork, 1.24" Counterbored Slot, Universal
BE11Ø1.25" Studded Pedestal Base Adapter, 1/4"-20 Thread
PH21Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 2"
TR1.51Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 1.5"
LMR11Lens Mount with Retaining Ring for Ø1" Optics, 8-32 Tap
SH25S05011/4"-20 Stainless Steel Cap Screw, 1/2" Long, 25 Pack
W25S05011/4" Washer, M6 Compatible, Stainless Steel, 100 Pack
View Metric Product List
Item #QtyDescription
Metric Product List
CF1251Clamping Fork, 1.24" Counterbored Slot, Universal
BE1/M1Ø31.8 mm Studded Pedestal Base Adapter, M6 Thread
PH50/M1Ø12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=50 mm
TR40/M1Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 40 mm
LMR1/M1Lens Mount with Retaining Ring for Ø1" Optics, M4 Tap
SH6MS121M6 x 1.0 Stainless Steel Cap Screw, 12 mm Long, 25 Pack
W25S05011/4" 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
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 Ø1.5" 0.36" (9.2 mm) Ø1.37" (Ø34.8 mm) 1.13" (28.7 mm) SM1.5RR SPW801
LMR1.5/M Ø1.38" (Ø34.9 mm)
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 -
  • 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 Support Documentation
LMR5Lens Mount with Retaining Ring for Ø5 mm Optics, 8-32 Tap
$19.41
Today
LMR6 Support Documentation
LMR6Lens Mount with Retaining Ring for Ø6 mm Optics, 8-32 Tap
$19.70
Today
LMR7 Support Documentation
LMR7Lens Mount with Retaining Ring for Ø7 mm Optics, 8-32 Tap
$19.98
Today
LMR8 Support Documentation
LMR8Lens Mount with Retaining Ring for Ø8 mm Optics, 8-32 Tap
$20.27
Today
LMR9 Support Documentation
LMR9Lens Mount with Retaining Ring for Ø9 mm Optics, 8-32 Tap
$20.56
Today
LMR10 Support Documentation
LMR10Lens Mount with Retaining Ring for Ø10 mm Optics, 8-32 Tap
$20.83
Today
LMR05 Support Documentation
LMR05Lens Mount with Retaining Ring for Ø1/2" Optics, 8-32 Tap
$16.99
Today
LMR05-P5 Support Documentation
LMR05-P5Lens Mount with Retaining Ring for Ø1/2" Optics, 8-32 Tap, 5 Pack
$80.70
Today
LMR15 Support Documentation
LMR15Lens Mount with Retaining Ring for Ø15 mm Optics, 8-32 Tap
$25.04
Today
LMR18 Support Documentation
LMR18Lens Mount with Retaining Ring for Ø18 mm Optics, 8-32 Tap
$27.48
Today
LMR20 Support Documentation
LMR20Lens Mount with Retaining Ring for Ø20 mm Optics, 8-32 Tap
$30.00
Today
LMR1 Support Documentation
LMR1Lens Mount with Retaining Ring for Ø1" Optics, 8-32 Tap
$16.47
Today
LMR1-P5 Support Documentation
LMR1-P5Lens Mount with Retaining Ring for Ø1" Optics, 8-32 Tap, 5 Pack
$78.19
Today
LMR30 Support Documentation
LMR30Lens Mount with Retaining Ring for Ø30 mm Optics, 8-32 Tap
$33.19
Today
LMR1.5 Support Documentation
LMR1.5Lens Mount with Retaining Ring for Ø1.5" Optics, 8-32 Tap
$27.95
Today
LMR40 Support Documentation
LMR40Customer Inspired! Lens Mount with Retaining Ring for Ø40 mm Optics, 8-32 Tap
$36.54
Today
LMR45 Support Documentation
LMR45Lens Mount with Retaining Ring for Ø45 mm Optics, 8-32 Tap
$37.57
Today
LMR2 Support Documentation
LMR2Lens Mount with Retaining Ring for Ø2" Optics, 8-32 Tap
$29.41
Today
LMR2-P5 Support Documentation
LMR2-P5Lens Mount with Retaining Ring for Ø2" Optics, 8-32 Tap, 5 Pack
$139.65
Today
LMR75 Support Documentation
LMR75Lens Mount with Retaining Ring for Ø75 mm Optics, 8-32 Tap
$61.14
Today
LMR3 Support Documentation
LMR3Customer Inspired! Lens Mount with Retaining Ring for Ø3" Optics, 8-32 Tap
$61.14
Today
LMR100 Support Documentation
LMR100Lens Mount with Retaining Ring for Ø100 mm Optics, 8-32 Tap
$75.11
Today
LMR4 Support Documentation
LMR4Customer 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 Support Documentation
LMR5/MLens Mount with Retaining Ring for Ø5 mm Optics, M4 Tap
$19.41
Today
LMR6/M Support Documentation
LMR6/MLens Mount with Retaining Ring for Ø6 mm Optics, M4 Tap
$19.70
Today
LMR7/M Support Documentation
LMR7/MLens Mount with Retaining Ring for Ø7 mm Optics, M4 Tap
$19.98
Today
LMR8/M Support Documentation
LMR8/MLens Mount with Retaining Ring for Ø8 mm Optics, M4 Tap
$20.27
Today
LMR9/M Support Documentation
LMR9/MLens Mount with Retaining Ring for Ø9 mm Optics, M4 Tap
$20.56
Today
LMR10/M Support Documentation
LMR10/M Lens Mount with Retaining Ring for Ø10 mm Optics, M4 Tap
$20.83
Today
LMR05/M Support Documentation
LMR05/MLens Mount with Retaining Ring for Ø1/2" Optics, M4 Tap
$16.99
Today
LMR05/M-P5 Support Documentation
LMR05/M-P5Lens Mount with Retaining Ring for Ø1/2" Optics, M4 Tap, 5 Pack
$80.70
Today
LMR15/M Support Documentation
LMR15/MLens Mount with Retaining Ring for Ø15 mm Optics, M4 Tap
$25.04
Today
LMR18/M Support Documentation
LMR18/MLens Mount with Retaining Ring for Ø18 mm Optics, M4 Tap
$27.48
Today
LMR20/M Support Documentation
LMR20/MLens Mount with Retaining Ring for Ø20 mm Optics, M4 Tap
$30.00
Today
LMR1/M Support Documentation
LMR1/MLens Mount with Retaining Ring for Ø1" Optics, M4 Tap
$16.47
Today
LMR1/M-P5 Support Documentation
LMR1/M-P5Lens Mount with Retaining Ring for Ø1" Optics, M4 Tap, 5 Pack
$78.19
Today
LMR30/M Support Documentation
LMR30/MLens Mount with Retaining Ring for Ø30 mm Optics, M4 Tap
$33.19
Today
LMR1.5/M Support Documentation
LMR1.5/MLens Mount with Retaining Ring for Ø1.5" Optics, M4 Tap
$27.95
Today
LMR40/M Support Documentation
LMR40/MCustomer Inspired! Lens Mount with Retaining Ring for Ø40 mm Optics, M4 Tap
$36.54
Today
LMR45/M Support Documentation
LMR45/MLens Mount with Retaining Ring for Ø45 mm Optics, M4 Tap
$37.57
Today
LMR2/M Support Documentation
LMR2/MLens Mount with Retaining Ring for Ø2" Optics, M4 Tap
$29.41
Today
LMR2/M-P5 Support Documentation
LMR2/M-P5Lens Mount with Retaining Ring for Ø2" Optics, M4 Tap, 5 Pack
$139.65
Today
LMR75/M Support Documentation
LMR75/MLens Mount with Retaining Ring for Ø75 mm Optics, M4 Tap
$61.14
Today
LMR3/M Support Documentation
LMR3/MCustomer Inspired! Lens Mount with Retaining Ring for Ø3" Optics, M4 Tap
$61.14
Today
LMR100/M Support Documentation
LMR100/MLens Mount with Retaining Ring for Ø100 mm Optics, M4 Tap
$75.11
Today
LMR4/M Support Documentation
LMR4/MCustomer Inspired! Lens Mount with Retaining Ring for Ø4" Optics, M4 Tap
$75.11
Today

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

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
  • 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
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
  • 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.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
LMR05V Support Documentation
LMR05VVacuum-Compatible Lens Mount with Retaining Ring for Ø1/2" Optics, 8-32 Tap
$31.48
Today
LMR1V Support Documentation
LMR1VVacuum-Compatible Lens Mount with Retaining Ring for Ø1" Optics, 8-32 Tap
$33.42
Today
LMR2V Support Documentation
LMR2VVacuum-Compatible Lens Mount with Retaining Ring for Ø2" Optics, 8-32 Tap
$47.85
Today
+1 Qty Docs Part Number - Metric Price Available
LMR05V/M Support Documentation
LMR05V/MVacuum-Compatible Lens Mount with Retaining Ring for Ø1/2" Optics, M4 Tap
$31.48
Today
LMR1V/M Support Documentation
LMR1V/MVacuum-Compatible Lens Mount with Retaining Ring for Ø1" Optics, M4 Tap
$33.42
Today
LMR2V/M Support Documentation
LMR2V/MVacuum-Compatible Lens Mount with Retaining Ring for Ø2" Optics, M4 Tap
$47.85
Today

Fixed Lens Mounts with Internal and External Threading

LMR1S Application Image
Click to Enlarge
View Imperial Product List
Item #QtyDescription
Imperial Product List
SM1D12C1SM1 Graduated Ring-Actuated Iris Diaphragm (Ø1.0 - Ø12.0 mm)
SM1L101SM1 Lens Tube, 1.00" Thread Depth, One Retaining Ring Included
LMR1S1Ø1" Lens Mount with Internal and External SM1 Threads, 8-32 Tap
TR41Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 4"
View Metric Product List
Item #QtyDescription
Metric Product List
SM1D12C1SM1 Graduated Ring-Actuated Iris Diaphragm (Ø1.0 - Ø12.0 mm)
SM1L101SM1 Lens Tube, 1.00" Thread Depth, One Retaining Ring Included
LMR1S/M1Ø1" Lens Mount with Internal and External SM1 Threads, M4 Tap
TR100/M1Ø12.7 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
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
  • 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.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
LMR05S Support Documentation
LMR05SØ1/2" Lens Mount with Internal and External SM05 Threads, 8-32 Tap
$28.07
Today
LMR1S Support Documentation
LMR1SCustomer Inspired! Ø1" Lens Mount with Internal and External SM1 Threads, 8-32 Tap
$30.68
Today
LMR2S Support Documentation
LMR2SØ2" Lens Mount with Internal and External SM2 Threads, 8-32 Tap
$36.41
Today
+1 Qty Docs Part Number - Metric Price Available
LMR05S/M Support Documentation
LMR05S/MØ1/2" Lens Mount with Internal and External SM05 Threads, M4 Tap
$28.07
Today
LMR1S/M Support Documentation
LMR1S/MCustomer Inspired! Ø1" Lens Mount with Internal and External SM1 Threads, M4 Tap
$30.68
Today
LMR2S/M Support Documentation
LMR2S/MØ2" Lens Mount with Internal and External SM2 Threads, M4 Tap
$36.41
Today

Fixed Lens Mounts with No Retaining Lip

  • 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
  • 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.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
SMR05 Support Documentation
SMR05Ø1/2" Lens Mount with SM05 Internal Threads and No Retaining Lip, 8-32 Tap
$20.23
Today
SMR1 Support Documentation
SMR1Ø1" Lens Mount with SM1 Internal Threads and No Retaining Lip, 8-32 Tap
$21.33
Today
SMR2 Support Documentation
SMR2Ø2" Lens Mount with SM2 Internal Threads and No Retaining Lip, 8-32 Tap
$30.00
Today
+1 Qty Docs Part Number - Metric Price Available
SMR05/M Support Documentation
SMR05/MØ1/2" Lens Mount with SM05 Internal Threads and No Retaining Lip, M4 Tap
$20.23
Today
SMR1/M Support Documentation
SMR1/MØ1" Lens Mount with SM1 Internal Threads and No Retaining Lip, M4 Tap
$21.33
Today
SMR2/M Support Documentation
SMR2/MØ2" Lens Mount with SM2 Internal Threads and No Retaining Lip, M4 Tap
$30.00
Today

Small Optic Adapters

Lens Mounted App Shot
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
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LMRA2 Support Documentation
LMRA2Ø1/2" Adapter for Ø2 mm Optics
$26.06
Today
LMRA3 Support Documentation
LMRA3Ø1/2" Adapter for Ø3 mm Optics
$26.06
Today
LMRA5 Support Documentation
LMRA5Ø1/2" Adapter for Ø5 mm Optics
$17.82
Today
LMRA6 Support Documentation
LMRA6Ø1/2" Adapter for Ø6 mm Optics
$17.82
Today
LMRA6.35 Support Documentation
LMRA6.35Ø1/2" Adapter for Ø6.35 mm Optics
$17.82
Today
LMRA7 Support Documentation
LMRA7Ø1/2" Adapter for Ø7 mm Optics
$16.41
Today
LMRA7.4 Support Documentation
LMRA7.4Ø1/2" Adapter for Ø7.4 mm Optics
$16.41
Today
LMRA8 Support Documentation
LMRA8Ø1/2" Adapter for Ø8 mm Optics
$17.82
Today
LMRA9 Support Documentation
LMRA9Ø1/2" Adapter for Ø9 mm Optics
$17.82
Today
LMRA10 Support Documentation
LMRA10Ø18 mm Adapter for Ø10 mm Optics
$23.75
Today

Retaining Rings for Fixed Lens Mounts

  • 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 Support Documentation
SM5RRM5.5 x 0.5 Retaining Ring for Ø5 mm Lens Mounts
$11.30
Today
SM6RR Support Documentation
SM6RRM6.5 x 0.5 Retaining Ring for Ø6 mm Lens Mounts
$11.30
Today
SM7RR Support Documentation
SM7RRM7.5 x 0.5 Retaining Ring for Ø7 mm Lens Mounts
$11.30
Today
SM8RR Support Documentation
SM8RRM8.5 x 0.5 Retaining Ring for Ø8 mm Lens Mounts
$11.30
Today
SM9RR Support Documentation
SM9RRM9.5 x 0.5 Retaining Ring for Ø9 mm Lens Mounts
$11.30
Today
SM10RR Support Documentation
SM10RRM10.5 x 0.5 Retaining Ring for Ø10 mm Lens Mounts
$11.30
Today
SM05RR Support Documentation
SM05RRSM05 Retaining Ring for Ø1/2" Lens Tubes and Mounts
$4.33
Today
SM05RR-P10 Support Documentation
SM05RR-P10SM05 Retaining Ring for Ø1/2" Lens Tubes and Mounts, 10 Pack
$38.93
Today
SM15RR Support Documentation
SM15RRM15.5 x 0.5 Retaining Ring for Ø15 mm Lens Mounts
$11.30
Today
SM18RR Support Documentation
SM18RR0.750"-40 Retaining Ring for Ø18 mm Lens Mounts
$11.30
Today
SM20RR Support Documentation
SM20RRM20.5 x 0.5 Retaining Ring for Ø20 mm Lens Mounts
$11.30
Today
SM1RR Support Documentation
SM1RRSM1 Retaining Ring for Ø1" Lens Tubes and Mounts
$4.87
Today
SM1RR-P10 Support Documentation
SM1RR-P10SM1 Retaining Ring for Ø1" Lens Tubes and Mounts, 10 Pack
$43.81
Today
SM30RR Support Documentation
SM30RRSM30 Retaining Ring for Ø30 mm Lens Tubes and Mounts
$12.63
Today
SM1.5RR Support Documentation
SM1.5RRSM1.5 Retaining Ring for Ø1.5" Lens Tubes and Mounts
$11.30
Today
SM40RR Support Documentation
SM40RRM40.5 x 0.5 Retaining Ring
$14.33
Today
SM45RR Support Documentation
SM45RRM45.5 x 0.5 Retaining Ring for Ø45 mm Lens Mounts
$14.55
Today
SM2RR Support Documentation
SM2RRSM2 Retaining Ring for Ø2" Lens Tubes and Mounts
$7.47
Today
SM2RR-P5 Support Documentation
SM2RR-P5SM2 Retaining Ring for Ø2" Lens Tubes and Mounts, 5 Pack
$33.58
Today
SM75RR Support Documentation
SM75RRM75.5 x 0.5 Retaining Ring for Ø75 mm Mounts
$16.59
Today
SM3RR Support Documentation
SM3RRSM3 Retaining Ring for Ø3" Lens Tubes and Mounts
$16.59
Today
SM100RR Support Documentation
SM100RRM100.75 x 0.5 Retaining Ring for Ø100 mm Mounts
$19.32
Today
SM4RR Support Documentation
SM4RRCustomer Inspired! SM4 Retaining Ring for Ø4" Mounts
$19.32
Today

Lens Mount Alignment Plates

Lens Mount Alignment Plate Application
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.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LMR05AP Support Documentation
LMR05APCustomer Inspired! Alignment Plate for Ø1/2" Fixed Lens Mounts
$23.75
Today
LMR1AP Support Documentation
LMR1APCustomer Inspired! Alignment Plate for Ø1" Fixed Lens Mounts
$27.48
3 weeks
LMR30AP Support Documentation
LMR30APAlignment Plate for Ø30 mm Fixed Lens Mounts
$36.59
Today
LMR1.5AP Support Documentation
LMR1.5APCustomer Inspired! Alignment Plate for Ø1.5" Fixed Lens Mounts
$36.59
Today
LMR2AP Support Documentation
LMR2APCustomer Inspired! Alignment Plate for Ø2" Fixed Lens Mounts
$32.61
Today
LMR3AP Support Documentation
LMR3APAlignment Plate for Ø3" and Ø75 mm Fixed Lens Mounts
$80.72
Today
LMR4AP Support Documentation
LMR4APAlignment Plate for Ø4" Fixed Lens Mounts
$102.25
Today

Spanner Wrenches for Retaining Rings

CT101 Application
Click to Enlarge

Stackable spanner wrenches, like the SPW603, can be fitted together to reach retaining rings in long lens tubes.
Spanner Wrench Application
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"
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SPW205 Support Documentation
SPW205Spanner Wrench for SM5RR Retaining Rings, Length = 1.00"
$20.56
Today
SPW206 Support Documentation
SPW206Spanner Wrench for SM6RR Retaining Rings, Length = 1.00"
$20.56
Today
SPW207 Support Documentation
SPW207Spanner Wrench for SM7RR Retaining Rings, Length = 1.00"
$20.56
Today
SPW208 Support Documentation
SPW208Spanner Wrench for SM8RR Retaining Rings, Length = 1.00"
$20.56
Today
SPW209 Support Documentation
SPW209Spanner Wrench for SM9RR Retaining Rings, Length = 1.00"
$20.56
Today
SPW210 Support Documentation
SPW210Spanner Wrench for SM10RR Retaining Rings, Length = 1.00"
$20.56
Today
SPW211 Support Documentation
SPW211Spanner Wrench for SM11RR Retaining Rings, Length = 1.00"
$20.56
Today
SPW603 Support Documentation
SPW603Spanner Wrench for SM05-Threaded Retaining Rings, Length = 1.00"
$27.98
Today
SPW603L Support Documentation
SPW603LSpanner Wrench for SM05-Threaded Retaining Rings, Graduated Scale with 0.02" (0.5 mm) Increments, Length = 3.88"
$64.58
Lead Time
SPW606 Support Documentation
SPW606Customer Inspired! Spanner Wrench for SM1-Threaded Retaining Rings, Length = 1.00"
$30.54
Today
SPW602 Support Documentation
SPW602Spanner Wrench for SM1-Threaded Retaining Rings, Graduated Scale with 0.02" (0.5 mm) Increments, Length = 3.88"
$30.54
Today
SPW607 Support Documentation
SPW607Customer Inspired! Spanner Wrench for SM30-Threaded Retaining Rings, Length = 4.35"
$46.82
Today
SPW608 Support Documentation
SPW608Spanner Wrench for SM1.5-Threaded Retaining Rings, Graduated Scale with 0.02" (0.5 mm) Increments, Length = 3.88"
$64.58
Lead Time
SPW604 Support Documentation
SPW604Customer Inspired! Spanner Wrench for SM2-Threaded Retaining Rings, Length = 4.35"
$50.82
Today
SPW605 Support Documentation
SPW605Spanner Wrench for SM3-Threaded Retaining Rings, Length = 4.35"
$89.36
Today

Adjustable Spanner Wrench

  • 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).

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SPW801 Support Documentation
SPW801Adjustable Spanner Wrench
$111.90
Today
SPW102 Support Documentation
SPW102Adjustable Spanner Wrench, Replacement Blade Set
$32.55
Today