Optical Component Threading Adapters with SM2 (2.035"-40) Threads


  • Integrate SM2-Threaded Components with Other Industry-Standard Threads
  • Adapters Available with Either Internal or
    External SM2 Threads

SM2L10

SM2A30

BE03-UVB

SM2A30 Adapter
Connecting an
SM2 Lens Tube
to a 3X Galilean
Beam Expander

SM2A6

External SM2 Threads
and Internal SM1 Threads

SM2T2

External SM2 Threads
with Locking Nuts

SM2A23

External M32 x 0.75 Threads
and Internal SM2 Threads

M2M40S

External SM2 Threads and
Internal M40 x 0.706 Threads

Related Items


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Interactive Selection Guide

SM2-Threaded Optical Component Adapters

This page contains all of our Optical Component Thread Adapters that feature SM2 (2.035"-40) threading. Adapters that have both internal and external threads are available, as well as adapters with two sets of internal or external threads.

Our SM2 adapters are a subset of our entire line of optical component thread adapters. To view our entire line, please see our Interactive Adapters Selection Guide.


Adapters with External SM2 and Internal Industry-Standard Threads
Item # Typical Application External Threads Internal Threads
SM2A32
info
 Integrate RMS Objective
into SM2 Lens Tube		 SM2 (2.035"-40) RMS (0.800"-36)
SM2A33
info
 Integrate M25 x 0.75 Objective
into SM2 Lens Tube		 SM2 (2.035"-40) M25 x 0.75
GCMA1 info Integrate M25 x 0.75 Scan Lens
into Galvo Mirror Mounting Adapter		 SM2 (2.035"-40) M25 x 0.75
SM2A54
info
 Mount Camera Lens to
SM2 Lens Tube		 SM2 (2.035"-40) C-Mount
(1.00"-32)
SM2A6
info
 Step Up/Down Lens Tube Size SM2 (2.035"-40) SM1 (1.035"-40)
SM2A11
info
 Step Up/Down Lens Tube Size SM2 (2.035"-40) SM30
(M30.5 x 0.5)
SM2A22
info
 Integrate M32 x 0.75 Objective into
SM2 Lens Tube		 SM2 (2.035"-40) M32 x 0.75
M2M32S info Integrate M32 x 0.75 Objective
with SM2 Mount		 SM2 (2.035"-40) M32 x 0.75
M2M34S info Integrate M34 x 1.0 Objective
with SM2 Mount		 SM2 (2.035"-40) M34 x 1.0
SM2A20
info
 Integrate Infinity-Corrected Lens Tube
to SM2 Lens Tube		 SM2 (2.035"-40) M38 x 0.5
SM2A29
info
 Integrate M39-Threaded Scan Lenses
to SM2 Lens Tube		 SM2 (2.035"-40) M39 x 1.0
M2M40S info Integrate M40 x 0.706 Objective
with SM2 Mount		 SM2 (2.035"-40) M40 x 0.706
SM2A57 info Step Up/Down Lens Tube Size SM2 (2.035"-40) SM1.5 (1.535"-40)
TMA3
info
 Mount Camera Lens to
SM2 Lens Tube		 SM2 (2.035"-40) T-Mount
(M42 x 0.75)
SM2A24
info
 Mount Camera Lens to
SM2 Lens Tube		 SM2 (2.035"-40) M42 x 1.0
SM2A30 Adapt M43 x 0.5 Component
to SM2 Lens Tube		 SM2 (2.035"-40) M43 x 0.5
SM2A27
info
 Mount Camera Lens to
SM2 Lens Tube		 SM2 (2.035"-40) M49 x 0.75
SM2A52
info
 Mount Camera Lens to
SM2 Lens Tube		 SM2 (2.035"-40) M52 x 0.75
SM3A2
info
 Step Up/Down Lens Tube Size SM2 (2.035"-40) SM3 (3.035"-40)
Adapters with Internal SM2 and External Industry-Standard Threads
Item # Typical Application External Threads Internal Threads
SM2A31
info
 Mount SM2 Lens Tube
to Camera with C-Mount Thread		 C-Mount (1.00"-32) SM2 (2.035"-40)
SM1A2
info
 Step Up/Down Lens Tube Size SM1 (1.035"-40) SM2 (2.035"-40)
SM2A12
info
 Step Up/Down Lens Tube Size SM30
(M30.5 x 0.5)		 SM2 (2.035"-40)
SM2A23
info
 Integrate SM2 Lens Tube into
M32 x 0.75 Mount		 M32 x 0.75 SM2 (2.035"-40)
SM2A19
info
 Adapt M36 x 1.5 Threaded Component to SM2 Lens Tube M36 x 1.5 SM2 (2.035"-40)
SM2A58 info Step Up/Down Lens Tube Size SM1.5 (1.535"-40) SM2 (2.035"-40)
TMA4
info
 Mount Camera Body to
SM2 Lens Tube		 T-Mount
(M42 x 0.75)		 SM2 (2.035"-40)
SM2A25
info
 Mount Camera Body to
SM2 Lens Tube		 M42 x 1.0 SM2 (2.035"-40)
SM2A26
info
 Mount Camera Body to
SM2 Lens Tube		 M49 x 0.75 SM2 (2.035"-40)
SM2A53
info
 Mount Camera Body to
SM2 Lens Tube		 M52 x 0.75 SM2 (2.035"-40)
SM2A28
info
 Mount M54 x 0.75 Components to an SM2 Lens Tube M54 x 0.75 SM2 (2.035"-40)
SM3A3
info
 Step Up/Down Lens Tube Size SM3 (3.035"-40) SM2 (2.035"-40)
Adapter with Internal SM2 and Internal Industry-Standard Threads
Item # Typical Application Internal Threads Internal Threads
SM2T1
info
 Mate Two Externally Threaded
SM2 Lens Tubes		 SM2 (2.035"-40) SM2 (2.035"-40)
Adapter with External SM2 and External Industry-Standard Threads
Item # Typical Application External Threads External Threads
SM2A55
info
 Mount Camera to
SM2 Lens Tube		 SM2 (2.035"-40) C-Mount
(1.00"-32)
SM2T2
info
 Mate Two Internally-Threaded
SM2 Lens Tubes		 SM2 (2.035"-40) SM2 (2.035"-40)

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.


Click to Enlarge
SM05 Threading: Ø1/2" Lens Tubes, 16 mm Cage Systems
External Thread, 0.535"-40.0, UNS-2A Internal Thread, 0.535"-40.0, UNS-2B
Max Major Diameter 0.5340" Min Major Diameter 0.5350"
Min Major Diameter 0.5289" Min Pitch Diameter 0.5188"
Max Pitch Diameter 0.5178" Max Pitch Diameter 0.5230"
Min Pitch Diameter 0.5146" Min Minor Diameter (and 83.3% of thread) 0.508"
Max Minor Diameter 0.5069" Max Minor Diameter (and 64.9% of thread) 0.514"
RMS Threading: Objective, Scan, and Tube Lenses
External Thread, 0.800"-36.0, UNS-2A Internal Thread, 0.800"-36.0, UNS-2B
Max Major Diameter 0.7989" Min Major Diameter 0.8000"
Min Major Diameter 0.7934" Min Pitch Diameter 0.7820"
Max Pitch Diameter 0.7809" Max Pitch Diameter 0.7866"
Min Pitch Diameter 0.7774" Min Minor Diameter (and 83.3% of thread) 0.770"
Max Minor Diameter 0.7688" Max Minor Diameter (and 64.9% of thread) 0.777"
C-Mount Threading: Machine Vision Lenses, CCD/CMOS Cameras
External Thread, 1.000"-32.0, UN-2A Internal Thread, 1.000"-32.0, UN-2B
Max Major Diameter 0.9989" Min Major Diameter 1.0000"
Min Major Diameter 0.9929" Min Pitch Diameter 0.9797"
Max Pitch Diameter 0.9786" Max Pitch Diameter 0.9846"
Min Pitch Diameter 0.9748" Min Minor Diameter (and 83.3% of thread) 0.966"
Max Minor Diameter 0.9651" Max Minor Diameter (and 64.9% of thread) 0.974"
SM1 Threading: Ø1" Lens Tubes, 30 mm Cage Systems
External Thread, 1.035"-40.0, UNS-2A Internal Thread, 1.035"-40.0, UNS-2B
Max Major Diameter 1.0339" Min Major Diameter 1.0350"
Min Major Diameter 1.0288" Min Pitch Diameter 1.0188"
Max Pitch Diameter 1.0177" Max Pitch Diameter 1.0234"
Min Pitch Diameter 1.0142" Min Minor Diameter (and 83.3% of thread) 1.008"
Max Minor Diameter 1.0068" Max Minor Diameter (and 64.9% of thread) 1.014"
SM30 Threading: Ø30 mm Lens Tubes
External Thread, M30.5x0.5 Internal Thread, M30.5x0.5
Max Major Diameter 30.480 mm Min Major Diameter 30.500 mm
Min Major Diameter 30.371 mm Min Pitch Diameter 30.175 mm
Max Pitch Diameter 30.155 mm Max Pitch Diameter 30.302 mm
Min Pitch Diameter 30.059 mm Min Minor Diameter (and 83.3% of thread) 29.959 mm
Max Minor Diameter 29.938 mm Max Minor Diameter (and 64.9% of thread) 30.094 mm
SM1.5 Threading: Ø1.5" Lens Tubes
External Thread, 1.535"-40, UNS-2A Internal Thread, 1.535"-40, UNS-2B
Max Major Diameter 1.5339" Min Major Diameter 1.535"
Min Major Diameter 1.5288" Min Pitch Diameter 1.5188"
Max Pitch Diameter 1.5177" Max Pitch Diameter 1.5236"
Min Pitch Diameter 1.5140" Min Minor Diameter (and 83.3% of thread) 1.508"
Max Minor Diameter 1.5068" Max Minor Diameter (and 64.9% of thread) 1.514"
SM2 Threading: Ø2" Lens Tubes, 60 mm Cage Systems
External Thread, 2.035"-40.0, UNS-2A Internal Thread, 2.035"-40.0, UNS-2B
Max Major Diameter 2.0338" Min Major Diameter 2.0350"
Min Major Diameter 2.0287" Min Pitch Diameter 2.0188"
Max Pitch Diameter 2.0176" Max Pitch Diameter 2.0239"
Min Pitch Diameter 2.0137" Min Minor Diameter (and 83.3% of thread) 2.008"
Max Minor Diameter 2.0067" Max Minor Diameter (and 64.9% of thread) 2.014"
SM3 Threading: Ø3" Lens Tubes
External Thread, 3.035"-40.0, UNS-2A Internal Thread, 3.035"-40.0, UNS-2B
Max Major Diameter 3.0337" Min Major Diameter 3.0350"
Min Major Diameter 3.0286" Min Pitch Diameter 3.0188"
Max Pitch Diameter 3.0175" Max Pitch Diameter 3.0242"
Min Pitch Diameter 3.0133" Min Minor Diameter (and 83.3% of thread) 3.008"
Max Minor Diameter 3.0066" Max Minor Diameter (and 64.9% of thread) 3.014"

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Adapters with External SM2 (2.035"-40) and Internal Industry-Standard Threads

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SM2A32 Support Documentation
SM2A32Adapter with External SM2 Threads and Internal RMS Threads
$29.69
Today
SM2A33 Support Documentation
SM2A33Adapter with External SM2 Threads and Internal M25 x 0.75 Threads
$29.69
Today
GCMA1 Support Documentation
GCMA1Adapter with External SM2 Threads and Internal M25 x 0.75 Threads, Ø35.0 mm Counterbore
$59.08
Today
SM2A54 Support Documentation
SM2A54Customer Inspired! Adapter with External SM2 Threads and Internal C-Mount Threads, 5.1 mm Long
$28.53
Today
SM2A6 Support Documentation
SM2A6Adapter with External SM2 Threads and Internal SM1 Threads
$28.53
Today
SM2A11 Support Documentation
SM2A11Customer Inspired! Adapter with External SM2 Threads and Internal SM30 Threads
$26.21
Today
SM2A22 Support Documentation
SM2A22Customer Inspired! Adapter with External SM2 Threads and Internal M32 x 0.75 Threads
$26.21
Today
M2M32S Support Documentation
M2M32SCustomer Inspired! Brass Microscope Adapter with External SM2 Threads and Internal M32 x 0.75 Threads
$68.25
Today
M2M34S Support Documentation
M2M34SCustomer Inspired! Brass Microscope Adapter with External SM2 Threads and Internal M34 x 1.0 Threads
$68.25
Today
SM2A20 Support Documentation
SM2A20Adapter with External SM2 Threads and Internal M38 x 0.5 Threads
$54.24
Today
SM2A57 Support Documentation
SM2A57Adapter with External SM2 Threads and Internal SM1.5 Threads
$26.61
Today
SM2A29 Support Documentation
SM2A29Adapter with External SM2 Threads and Internal M39 x 1.0 Threads
$38.50
Today
TMA3 Support Documentation
TMA3Customer Inspired! Adapter with External SM2 to Internal T-Mount
$26.21
Today
M2M40S Support Documentation
M2M40SCustomer Inspired! Brass Microscope Adapter with External SM2 Threads and Internal M40 x 0.706 Threads
$68.25
Today
SM2A24 Support Documentation
SM2A24Adapter with External SM2 Threads and Internal M42 x 1.0 Threads
$26.21
Today
SM2A30 Support Documentation
SM2A30Adapter with External SM2 Threads and Internal M43 x 0.5 Threads
$17.82
Today
SM2A27 Support Documentation
SM2A27Customer Inspired! Adapter with External SM2 Threads and Internal M49 x 0.75 Threads
$33.50
Today
SM2A52 Support Documentation
SM2A52Adapter with External SM2 Threads and Internal M52 x 0.75 Threads
$23.18
Today
SM3A2 Support Documentation
SM3A2Adapter with External SM2 Threads and Internal SM3 Threads
$34.66
Today

Adapters with Internal SM2 (2.035"-40) and External Industry-Standard Threads

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SM2A31 Support Documentation
SM2A31Adapter with External C-Mount Threads and Internal SM2 Threads, 4.9 mm Spacer
$29.69
Today
SM1A2 Support Documentation
SM1A2Adapter with External SM1 Threads and Internal SM2 Threads
$27.84
Today
SM2A12 Support Documentation
SM2A12Customer Inspired! Adapter with External SM30 Threads and Internal SM2 Threads
$33.50
Today
SM2A23 Support Documentation
SM2A23Customer Inspired! Adapter with External M32 x 0.75 Threads and Internal SM2 Threads
$26.21
Today
SM2A19 Support Documentation
SM2A19Adapter with External M36x1.5 Threads and Internal SM2 Threads
$34.66
Today
SM2A58 Support Documentation
SM2A58Adapter with External SM1.5 and Internal SM2 Threads
$26.61
Today
TMA4 Support Documentation
TMA4Customer Inspired! Adapter with External T-Mount to Internal SM2
$26.21
Lead Time
SM2A25 Support Documentation
SM2A25Adapter with External M42 x 1.0 Threads and Internal SM2 Threads
$26.21
Today
SM2A26 Support Documentation
SM2A26Customer Inspired! Adapter with External M49 x 0.75 Threads and Internal SM2 Threads
$33.50
Today
SM2A53 Support Documentation
SM2A53Adapter with External M52 x 0.75 Threads and Internal SM2 Threads
$23.18
3 weeks
SM2A28 Support Documentation
SM2A28Customer Inspired! Adapter with External M54 x 0.75 Threads and Internal SM2 Threads
$33.50
Today
SM3A3 Support Documentation
SM3A3Customer Inspired! Adapter with External SM3 Threads and Internal SM2 Threads
$34.66
Today

Adapters with External SM2 (2.035"-40) and External Industry-Standard Threads

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SM2A55 Support Documentation
SM2A55Adapter with External C-Mount Threads and External SM2 Threads, 3.2 mm Spacer
$31.15
Today
SM2T2 Support Documentation
SM2T2SM2 (2.035"-40) Coupler, External Threads, 1/2" Long
$40.48
Today

Adapter with Internal SM2 (2.035"-40) and Internal Industry-Standard Threads

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SM2T1 Support Documentation
SM2T1SM2 (2.035"-40) Coupler, Internal Threads
$21.43
3 weeks
Additional Optical Component Thread Adapters
  • SM05-Threaded Adapters

  • RMS-Threaded Adapters

  • M25 x 0.75-Threaded Adapters

  • C-Mount-Threaded Adapters

  • SM1-Threaded Adapters

  • M32 x 0.75-Threaded Adapters

  • SM1.5-Threaded Adapters

  • SM2-Threaded Adapters

  • M52 x 0.75-Threaded Adapters

  • SM3-Threaded Adapters