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Lens Tube Couplers


  • Connect Two Lens Tubes Together
  • Threaded and Clamping Couplers Available
  • Options for SM05, SM1, SM2, SM3, and C-Mount Threading
  • Locking Rings Create Mechanical Stop Along Threads

SM2T1

Couples Two
Externally Threaded
SM2 Lens Tubes

CMT10

Couples Two
Internally Threaded
C-Mount Lens Tubes

SM1S10

Spacer for Two Internally Threaded SM1 Lens Tubes

SM1CPL

Shown Clamping Two
SM1 Lens Tubes

Application Idea

SM1CMM Shown Coupling Two KCB1 Kinematic Mirror Mounts

CMNT1

Slotted C-Mount
Locking Ring

Related Items


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Thorlabs' Lens Tube Couplers are available with internal threading, external threading, or clamping designs, making it possible to couple our SM05, SM1, SM2, or SM3 Lens Tubes, as well as our C-Mount Extension Tubes. Our threaded lens tube couplers are designed to couple two components with external threads or two components with internal threads.

Additional Ø1" Lens Tube Couplers
Our Non-Rotating Couplers for SM1 Lens Tubes are ideal for mounting SM1-threaded components that are sensitive to rotation, such as wired components or lens tubes with polarization optics. Coupling adapters are threaded onto the lens tubes and then clamped together, allowing components to be joined without rotating the component. These light-tight couplers are also ideal for bridging existing lens tube systems.

The Flexure Sleeve Couplers allow SM1 lens tubes and C-Mount extension tubes to be locked independently. The flexure clamping mechanism allows lens tubes to be positioned with either external or internal threads facing outward. These couplers feature a light-tight design.

Externally threaded lens tube couplers can be used to create assemblies that require optics to be mounted in specific orientations. When the orientation is adjusted, the tube length also changes. Here, the threaded coupler is used to build a setup that incorporates crossed polarizers. Note that the white line on each polarizer housing indicates the transmission axis. For applications sensitive to distance as well as orientation, please see our Non-Rotating Couplers below.

Click to Enlarge

View Imperial Product List
Item #QtyDescription
Imperial Product List
SM1T201SM1 (1.035"-40) Coupler, External Threads, 2" Long
CP021SM1-Threaded 30 mm Cage Plate, 0.35" Thick, 2 Retaining Rings, 8-32 Tap
CP02F1SM1-Threaded 30 mm Flexure Cage Plate, 0.35" Thick, 2 Retaining Rings, Imperial
ER2-P41Cage Assembly Rod, 2" Long, Ø6 mm, 4 Pack
ER3-P41Cage Assembly Rod, 3" Long, Ø6 mm, 4 Pack
C4W130 mm Cage Cube
CCM1-M01130 mm Cage Cube-Mounted Protected Gold Turning Mirror, 8-32 Tap
View Metric Product List
Item #QtyDescription
Metric Product List
SM1T201SM1 (1.035"-40) Coupler, External Threads, 2" Long
CP02/M1SM1-Threaded 30 mm Cage Plate, 0.35" Thick, 2 Retaining Rings, M4 Tap
CP02F/M1SM1-Threaded 30 mm Flexure Cage Plate, 0.35" Thick, 2 Retaining Rings, Metric
ER2-P41Cage Assembly Rod, 2" Long, Ø6 mm, 4 Pack
ER3-P41Cage Assembly Rod, 3" Long, Ø6 mm, 4 Pack
C4W130 mm Cage Cube
CCM1-M01/M130 mm Cage Cube-Mounted Protected Gold Turning Mirror, M4 Tap
The SM1T20 Lens Tube Coupler can be used to join sliding 30 mm cage system segments. In the photo above, the locking rings on the SM1T20 Coupler are tightened to retain the rotational alignment of the two cage segments. The cage rod flexure screws on the CP02F Cage Plate must be loosened to allow the cage segment on the right to slide.

Click to Enlarge

Slotted locking rings can be tightened using the SPW502 and SPW503 wrenches.

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:
Posted Date:2014-10-13 16:41:59.227
On SM05 and SM1 couplers, can I confirm, as suggested by the Autocad PDF files, that two retaining rings are supplied and so aren't required as an additional order i.e. SM05T2 is sufficient for mounting two tubes and locking them in place?
Poster:cdaly
Posted Date:2014-10-13 02:14:55.0
Response from Chris at Thorlabs: The internally threaded SM05T1 and SM1T1 couplers do not come with retaining rings. The externally threaded SM05T2 and SM1T2 couplers do both come with the two locking nuts shown. SM05T2 can be used to mount together two internally threaded ends of lens tubes, locking them in place with the provided nuts.
Poster:steve
Posted Date:2013-06-04 00:01:55.8
How about an electrical isolating version (external and/or internal threads). For example, many laser diodes have their case electrically live and thus when mounted to your tubes, the whole tube assembly and whatever is connects to becomes connected. Especially an issue if you also mount a bare photodiode into a tube wince photodiodes also often have their case electrically active. I see you make Delrin adaptors for thermal isolation.
Poster:tcohen
Posted Date:2013-06-06 12:45:00.0
Response from Tim at Thorlabs: Thank you for your suggestion. The anodization process used on the majority of our optomech makes them fairly electrically isolated.
Poster:tcohen
Posted Date:2012-07-19 10:56:00.0
Response from Tim at Thorlabs: Thank you very much for your feedback! This can be done with lens tubes and the adapters on this page, but I agree that this would be a much more convenient solution. Our design team will look at this. ~1/3 of our products are customer inspired, including the original versions of these. Thank you for sharing your feedback so that we can continue to increase our selection with products directly relevant to your applications.
Poster:nkad
Posted Date:2012-07-17 15:29:53.0
A much longer range of externally threaded SM1 coupling tubes would be really helpful, this would allow for a huge range of adjustment between enclosed optics. I would suggest 4" and 6".
Poster:acable
Posted Date:2007-12-12 10:14:08.0
It would be really helpful to have photos for each of the individual parts shown on this page.

SM05 Lens Tube Couplers

The SM05T1 is an internally threaded coupler for joining two externally threaded SM05 (0.535"-40) components. It is designed to directly mate two of our SM05-threaded standard lens tubes.

Thorlabs offers three externally threaded couplers for joining internally SM05-threaded components. These feature external threads along the entire length of the part, allowing for optimization of the position and angle of the attached components. Each coupler ships with two SM05NT locking rings, which can be tightened by hand to secure the attached components. Additional locking rings can be purchased separately to limit the external thread depth of any SM05-threaded components. The use of multiple locking rings allows lens tubes to be locked independently, such as when using crossed polarizers (see the video above for a demonstration).

For applications where it is difficult to reach the locking ring by hand, we offer the SM05NT1 Slotted Locking Ring and SPW502 Spanner Wrench. This locking ring contains slots for the 3/4" end of the spanner wrench.

The table below lists the specifications for all available couplers and locking rings.

Item # SM05T1 SM05T2 SM05T10 SM05T20 SM05NT SM05NT1
Description SM05 Lens Tube Coupler SM05 Locking Ring Slotted SM05 Locking Ring
Threads Internal SM05 External SM05 Internal SM05
Length 0.28" (7.1 mm) 0.5" (12.7 mm) 1.0" (25.4 mm) 2.0" (50.8 mm) 0.11" (2.8 mm)
Lens Tube
Separation Rangea
N/A 0.22" - 0.34"
(5.6 mm - 8.6 mm)
0.22" - 0.84"
(5.6 mm - 21.3 mm)
0.22" - 1.84"
(5.6 mm - 46.7 mm)
N/A
Drawing
  • The minimum is based on the sum of the thickness of two SM05NT locking rings (or equivalently two SM05NT1 locking rings), and the maximum is based on the length of the tube minus a 0.08" (2 mm) minimum thread depth for both attached components.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
SM05T1 Support Documentation
SM05T1SM05 (0.535"-40) Coupler, Internal Threads
$9.20
Today
SM05T2 Support Documentation
SM05T2SM05 (0.535"-40) Coupler, External Threads, 0.5" Long
$18.40
Today
SM05T10 Support Documentation
SM05T10SM05 (0.535"-40) Coupler, External Threads, 1” Long
$20.40
Today
SM05T20 Support Documentation
SM05T20SM05 (0.535"-40) Coupler, External Threads, 2” Long
$22.50
Today
SM05NT Support Documentation
SM05NTSM05 (0.535"-40) Locking Ring, 0.75" Outer Diameter
$6.45
Today
SM05NT1 Support Documentation
SM05NT1SM05 (0.535"-40) Locking Ring, 0.75" Outer Diameter, Slots for Spanner Wrench
$8.20
Today

C-Mount Extension Tube Couplers

The CMT1 is an internally C-Mount-threaded coupler for joining two externally threaded C-Mount (1.00"-32) components. Its length of 0.35" is designed for direct mating of two C-Mount Extension Tubes.

The CMT2 and CMT10 externally threaded couplers are designed for joining internally C-Mount-threaded components. These feature external threads along the entire length of the part, allowing the relative position and rotation of a camera and lens to be adjusted. Each coupler ships with two CMNT Locking Rings, which can be tightened by hand to secure the attached components. Additional locking rings can be purchased separately to limit the external thread depth of any C-Mount-threaded components. The use of multiple locking rings allows lens tubes to be locked independently, such as when using crossed polarizers (see the video above).

For applications where it is difficult to reach the locking ring by hand, we offer the CMNT1 Slotted Locking Ring and SPW502 Spanner Wrench. This locking ring contains slots for the 1¼" end of the spanner wrench.

The table below gives the specifications for all available couplers and locking rings.

Item # CMT1 CMT2 CMT10 CMNT CMNT1
Description C-Mount Extension Tube Coupler C-Mount Locking Ring C-Mount Slotted Locking Ring
Threads Internal C-Mount External C-Mount Internal C-Mount
Length 0.35" (8.9 mm) 0.5" (12.7 mm) 1.0" (25.4 mm) 0.11" (2.8 mm)
Lens Tube
Separation Rangea
N/A 0.22" - 0.34" 
(5.6 mm - 8.6 mm)
0.22" - 0.84"
(5.6 mm - 21.3 mm)
N/A N/A
Drawing
  • The minimum is based on the sum of the thickness of two CMNT locking rings (or equivalently two CMNT1 locking rings), and the maximum is based on the length of the tube minus a 0.08" (2 mm) minimum thread depth for both attached components.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
CMT1 Support Documentation
CMT1C-Mount (1.00"-32) Coupler, Internal Threads
$9.70
Today
CMT2 Support Documentation
CMT2C-Mount (1.00"-32) Coupler, External Threads, 0.5" Long
$19.90
Today
CMT10 Support Documentation
CMT10C-Mount (1.00"-32) Coupler, External Threads, 1" Long
$20.40
3-5 Days
CMNT Support Documentation
CMNTC-Mount (1.00"-32) Locking Ring, 1.25" Outer Diameter
$6.65
Today
CMNT1 Support Documentation
CMNT1C-Mount (1.00"-32) Locking Ring, 1.25" Outer Diameter, Slots for Spanner Wrench
$10.20
Today

SM1 Lens Tube Couplers

The SM1T1 is an internally SM1-threaded coupler for joining two externally threaded SM1 (1.035"-40) components. Its length of 0.28" is designed for direct mating of two standard lens tubes (SM1Lxx series). 

Thorlabs offers five externally threaded couplers for joining internally SM1-threaded components. These feature external threads along the entire length of the part, allowing for optimization of the position and angle of the attached components. Each one ships with two SM1NT locking rings, which can be tightened by hand to secure the attached components. Additional locking rings can be purchased separately to limit the external thread depth of any SM1-threaded components. The use of multiple locking rings allows lens tubes to be locked independently, such as when using crossed polarizers (see the video above for a demonstration).

For applications where it is difficult to reach the locking ring by hand, we offer the SM1NT1 Slotted Locking Ring and SPW502 Spanner Wrench. This locking ring contains slots for the 1¼" end of the spanner wrench.

For a one-component solution for spacing two externally threaded SM1 components at a fixed distance, please see our line of lens tubes without external threads, available in lengths ranging from 0.5" to 3.5". For a one-component solution for spacing internally threaded SM1 components at a fixed distance, see our selection of SM1 Lens Tube Spacers below.

The table below gives the specifications for all available couplers and locking rings. 

Item # SM1T1 SM1T2 SM1T10 SM1T20 SM1T30 SM1T40 SM1NT SM1NT1
Description SM1 Lens Tube Coupler SM1 Locking Ring Slotted SM1 Locking Ring
Threads Internal SM1 External SM1 Internal SM1 Internal SM1
Length 0.28" (7.1 mm) 0.5" (12.7 mm) 1.0" (25.4 mm) 2.0" (50.8 mm) 3.0" (76.2 mm) 4.0" (101.6 mm) 0.11" (2.8 mm) 0.11" (2.8 mm)
Lens Tube
Separation
Rangea
N/A 0.22" - 0.34"
(5.6 mm - 8.6 mm)
0.22" - 0.84"
(5.6 mm - 21.3 mm)
0.22" - 1.84"
(5.6 mm - 46.7 mm)
0.22" - 2.84"
(5.6 mm - 72.1 mm)
0.22" - 3.84"
(5.6 mm - 97.5 mm)
N/A N/A
Drawing
  • The minimum is based on the sum of the thickness of two SM1NT locking rings (or equivalently two SM1NT1 locking rings), and the maximum is based on the length of the tube minus a 0.08" (2 mm) minimum thread depth for both attached components.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
SM1T1 Support Documentation
SM1T1SM1 (1.035"-40) Coupler, Internal Threads
$9.70
Today
SM1T2 Support Documentation
SM1T2SM1 (1.035"-40) Coupler, External Threads, 0.5" Long
$19.90
Today
SM1T10 Support Documentation
SM1T10Customer Inspired!SM1 (1.035"-40) Coupler, External Threads, 1" Long
$20.40
Today
SM1T20 Support Documentation
SM1T20Customer Inspired!SM1 (1.035"-40) Coupler, External Threads, 2" Long
$22.50
Today
SM1T30 Support Documentation
SM1T30SM1 (1.035"-40) Coupler, External Threads, 3" Long
$28.75
Today
SM1T40 Support Documentation
SM1T40Customer Inspired!SM1 (1.035"-40) Coupler, External Threads, 4" Long
$34.75
Today
SM1NT Support Documentation
SM1NTSM1 (1.035"-40) Locking Ring, 1.25" Outer Diameter
$6.65
Today
SM1NT1 Support Documentation
SM1NT1SM1 (1.035"-40) Locking Ring, 1.25" Outer Diameter, Slots for Spanner Wrench
$9.40
Today

SM1 Lens Tubes Without Internal Threads

Lens Tube Spacer
Click to Enlarge

View Imperial Product List
Item #QtyDescription
Imperial Product List
PH41Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 4"
SM1S301SM1 Lens Tube Spacer, 3" Long
SM1L30C2SM1 Slotted Lens Tube, 3" Thread Depth, 2 Retaining Rings Included
TR31Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 3"
SM1RC1Ø1.20" Slip Ring for SM1 Lens Tubes and C-Mount Extension Tubes, 8-32 Tap
View Metric Product List
Item #QtyDescription
Metric Product List
SM1S301SM1 Lens Tube Spacer, 3" Long
SM1L30C2SM1 Slotted Lens Tube, 3" Thread Depth, 2 Retaining Rings Included
PH100/M1Ø12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=100 mm
SM1RC/M1Ø1.20" Slip Ring for SM1 Lens Tubes and C-Mount Extension Tubes, M4 Tap
TR75/M1Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 75 mm
SM1S30 Lens Tube Spacer Used to Separate Two SM1L30C
Slotted Lens Tubes
SM1Lxx Lens Tube Diagram
  • Use as Spacers Between Lens Tubes
  • External SM1 Threading on Each End
  • Six Lengths Ranging from 1.0" (25.4 mm) to 3.5" (88.9 mm)

These externally threaded 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).

The figure to the right shows two SM1L30C slotted lens tubes holding two plano-convex lenses. Separating these is the SM1S30 lens tube spacer, attached to a post with an SM1RC lens tube slip ring. Lens tube spacers allow significant space to be added between two fixed lenses using only one component. 

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
$12.30
Today
SM1S15 Support Documentation
SM1S15SM1 Lens Tube Spacer, 1.5" Long
$14.30
Today
SM1S20 Support Documentation
SM1S20Customer Inspired!SM1 Lens Tube Spacer, 2" Long
$14.30
Today
SM1S25 Support Documentation
SM1S25SM1 Lens Tube Spacer, 2.5" Long
$20.40
Today
SM1S30 Support Documentation
SM1S30Customer Inspired!SM1 Lens Tube Spacer, 3" Long
$20.40
Today
SM1S35 Support Documentation
SM1S35SM1 Lens Tube Spacer, 3.5" Long
$23.60
Today

SM1 Lens Tubes Without External Threads

SM1Mxx Lens Tube Diagram
  • Allows Coupling of Two Externally SM1-Threaded Components
  • Use with Lens Tube Couplers to Stack Multiple Lens Tubes
  • Seven Lengths Ranging from 1/2" (12.7 mm) to 3.5" (88.9 mm)

These internally threaded Lens Tubes are designed to connect two components with external SM1 threads. Alternatively, optics can be housed inside with access to both ends. To join these lens tubes end-to-end, use an SM1 Lens Tube Coupler, sold above. 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
$12.30
Today
SM1M10 Support Documentation
SM1M10Customer Inspired!SM1 Lens Tube Without External Threads, 1" Long, Two Retaining Rings Included
$13.60
Today
SM1M15 Support Documentation
SM1M15SM1 Lens Tube Without External Threads, 1.5" Long, Two Retaining Rings Included
$15.90
Today
SM1M20 Support Documentation
SM1M20Customer Inspired!SM1 Lens Tube Without External Threads, 2" Long, Two Retaining Rings Included
$15.90
Today
SM1M25 Support Documentation
SM1M25SM1 Lens Tube Without External Threads, 2.5" Long, Two Retaining Rings Included
$17.10
Today
SM1M30 Support Documentation
SM1M30Customer Inspired!SM1 Lens Tube Without External Threads, 3" Long, Two Retaining Rings Included
$17.10
Today
SM1M35 Support Documentation
SM1M35SM1 Lens Tube Without External Threads, 3.5" Long, Two Retaining Rings Included
$27.50
3-5 Days

SM1 Non-Rotating Lens Tube Couplers


SM1CMF Installation

Click for Details

SM1CMF Coupler Diagram
Bundle Contents
Item # SM1CFF SM1CMF SM1CMM
Adapters Two
Internal SM1
Adapters
(SM1CF)
Internal SM1
Adapter
(SM1CF)
Two
External SM1
Adapters
(SM1CM)
External SM1
Adapter
(SM1CM)
Coupler
Clamp and Centering Ring (SM1CH)
  • Non-Rotating, Light-Tight Coupler Connects SM1 Lens Tubes
  • Clamp Housing Binds Separate SM1-Threaded Assemblies Together
  • Clamp and Thread Mating Adapters Available in Bundles or as Separate Components
  • Compatible with KF25 Vacuum Hardware*
  • #8 (M4) Counterbore for use with Ø1/2" Posts

Thorlabs' Non-Rotating SM1 Lens Tube Couplers enable SM1-threaded (1.035"-40) lens tubes or components to be joined without rotating the component to engage the SM1 thread. This allows SM1 lens tube systems to be mated without changing the orientation, which is critical in polarization applications. These couplers also allow SM1-threaded components, such as our power meter sensors or other SM1-threaded detectors, to be attached to a system without coiling the sensor cable.


Click for Details

Components Included with SM1CMF Bundle
(Lens Tubes and Post Sold Separately)

To join two SM1-threaded components together, an adapter with internal or external threads is attached to each part. An aluminum centering ring with a Viton® O-Ring is inserted between the adapters and the parts are pressed together. The clamp housing is then engaged using a 5/64" (2 mm) hex key, which compresses the adapters and O-ring together, creating a light-tight and airtight seal. The clamp housing offers a #8 (M4) counterbore for mounting to our Ø1/2" Posts.

*Due to the outgassing of anodized aluminum, this coupler is not suitable for vacuum applications. Only the coupling adapters are compatible with KF25 centering rings and clamping hardware. For purging applications, positive pressure can be maintained up to 50 psi (3.4 bar).

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
SM1CFF Support Documentation
SM1CFFCustomer Inspired!SM1 Non-Rotating Coupler Bundle, Internal/Internal Threads
$76.50
Today
SM1CMF Support Documentation
SM1CMFCustomer Inspired!SM1 Non-Rotating Coupler Bundle, External/Internal Threads
$76.50
Today
SM1CMM Support Documentation
SM1CMMCustomer Inspired!SM1 Non-Rotating Coupler Bundle, External/External Threads
$76.50
Today
SM1CH Support Documentation
SM1CHCustomer Inspired!SM1 Non-Rotating Coupler Clamp and Centering Ring
$48.00
Today
SM1CF Support Documentation
SM1CFCustomer Inspired!SM1 Non-Rotating Coupling Adapter, Internal Threads
$14.30
Today
SM1CM Support Documentation
SM1CMCustomer Inspired!SM1 Non-Rotating Coupling Adapter, External Threads
$14.30
Today

SM1 Lens Tube Flexure Sleeve Couplers

SM1CPL
Click to Enlarge
SM1CPL Holding Two Ø1" Lens Tubes. A rubber gasket makes the coupler light tight.
SM1CPL Hex Screw
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Lens Tubes Are Secured by Tightening Two 5/64" Hex Screws
  • Flexure Design Holds SM1 Lens Tubes, C-Mount Extension Tubes, or Other Ø1.2" Outer Diameter Cylindrical Objects
  • Available in Three Lengths: 0.5", 1.0", and 3.0"
  • RTV103 Black Silicone Gasket Provides Light-Tight Coupling
  • Lens Tubes can be Positioned Along the Entire Length, Facing Either Direction

These Lens Tube Couplers are flexure-clamping sleeves that can hold any Ø1" lens tube, C-Mount extension tube, or other Ø1.2" outer diameter cylindrical object. A lens tube can be slid into each end of the coupler and secured by tightening the two 5/64" (2 mm) hex screws on the side of the sleeve.

Each coupler features an RTV103 black silicone gasket along the clamping section to provide light-tight coupling of lens tubes (see photos to the right). Lens tubes can be mounted at any position along the length of the coupler as long as there is at least 6 mm of the tube inside the clamp. They can be clamped with either the internal or external threads facing out.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
SM1CPL05 Support Documentation
SM1CPL05SM1 Lens Tube Flexure Sleeve Coupler, 0.5" Long
$33.00
Today
SM1CPL10 Support Documentation
SM1CPL10SM1 Lens Tube Flexure Sleeve Coupler, 1.0" Long
$34.00
Today
SM1CPL Support Documentation
SM1CPLSM1 Lens Tube Flexure Sleeve Coupler, 3.0" Long
$49.00
Today

SM2 Lens Tube Couplers

The SM2T1 is an internally threaded coupler for joining two externally threaded SM2 (2.035"-40) components. It is designed to directly mate two of our SM2-threaded standard lens tubes.

Thorlabs offers three externally threaded couplers for joining internally SM2-threaded components. These feature external threads along the entire length of the part, allowing for optimization of the position and angle of the attached components. Each coupler ships with two SM2NT locking rings, which can be tightened by hand to secure the attached components. Additional locking rings can be purchased separately to limit the external thread depth of any SM2-threaded components. The use of multiple locking rings allows lens tubes to be locked independently, such as when using crossed polarizers (see the video above for a demonstration).

For applications where it is difficult to reach the locking ring by hand, we offer the SM2NT1 Slotted Locking Ring and SPW503 Spanner Wrench. This locking ring contains slots for the 2¼" end of the spanner wrench.

The table below gives the specifications for all available couplers and locking rings.

Item # SM2T1 SM2T2 SM2T10 SM2T20 SM2NT SM2NT1
Description SM2 Lens Tube Coupler SM2 Locking Ring SM2 Slotted Locking Ring
Threads Internal SM2 External SM2 Internal SM2
Length 0.26" (6.6 mm) 0.5" (12.7 mm) 1.0" (25.4 mm) 2.0" (50.8 mm) 0.11" (2.8 mm)
Max Adjustment Rangea N/A 0.22" - 0.34"
(5.6 mm - 8.6 mm)
0.22" - 0.84"
(5.6 mm - 21.3 mm)
0.22" - 1.84"
(5.6 mm - 46.7 mm)
N/A
Drawing
  • The minimum is based on the sum of the thickness of two SM2NT locking rings (or equivalently two SM2NT1 locking rings), and the maximum is based on the length of the tube minus a 0.08" (2 mm) minimum thread depth for both attached components.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
SM2T1 Support Documentation
SM2T1SM2 (2.035"-40) Coupler, Internal Threads
$18.40
Today
SM2T2 Support Documentation
SM2T2SM2 (2.035"-40) Coupler, External Threads, 1/2" Long
$34.75
Today
SM2T10 Support Documentation
SM2T10SM2 (2.035"-40) Coupler, External Threads, 1" Long
$35.75
Today
SM2T20 Support Documentation
SM2T20SM2 (2.035"-40) Coupler, External Threads, 2" Long
$37.75
Today
SM2NT Support Documentation
SM2NTSM2 (2.035"-40) Locking Ring, 2.25" Outer Diameter
$14.30
Today
SM2NT1 Support Documentation
SM2NT1SM2 (2.035"-40) Locking Ring, 2.25" Outer Diameter, Slots for Spanner Wrench
$9.70
3-5 Days

SM3 Lens Tube Couplers

SM3T1 Lens Tube Coupler
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SM3T1 used to Couple Two Externally-Threaded Ø3" Lens Tubes
Item # SM3T1 SM3T2 SM3NT
Description SM3 Lens Tube Coupler SM3 Lock Nut
Threads Internal SM3 External SM3 Internal SM3
Length 0.28"
(7.1 mm)
0.5"
(12.7 mm)
0.11"
(2.8 mm)
Max Adjustment Rangea N/A 0.22" - 0.34"
(5.6 - 8.6 mm)
N/A
Drawing
  • Including two SM3NT locking rings (or equivalently two SM3NT1
    locking rings) and 0.08" (2 mm) minimum thread depth for both
    attached components.

The SM3T1 is an internally threaded coupler for joining two externally threaded SM3 (3.035"-40) components. It is designed to directly mate two of our SM3-threaded standard lens tubes.

The SM3T2 Coupler features external SM3 threading (3.035"-40), which enables the coupling of two components with internal SM3 threads. It ships with two SM3NT locking rings, which can be used to lock the position of an attached SM3 component.

Additional locking rings (Item # SM3NT) can be purchased separately to limit the external thread depth of any SM3-threaded components. The use of multiple locking rings is particularly desirable in situations where you have two components with preferential relative directions, such as when using crossed polarizers (see the video above for a demonstration).

The table to the right gives the specifications for all available items.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
SM3T1 Support Documentation
SM3T1Customer Inspired!SM3 (3.035"-40) Coupler, Internal Threads
$28.25
Today
SM3T2 Support Documentation
SM3T2SM3 (3.035"-40) Lens Tube Coupler, External Threads
$38.00
Today
SM3NT Support Documentation
SM3NTCustomer Inspired!SM3 (3.035"-40) Locking Ring, 3.25" Outer Diameter
$15.30
Today
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