Optical Component Threading Adapters with RMS (0.800"-36) Threads


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

RMSA6

External RMS Threads
and Internal C-Mount Threads

RMSA1

External M25 x 0.75 Threads
and Internal RMS Threads

M32RMSS

External M32 x 0.75 Threads
and Internal RMS Threads

RMS-Threaded Objective Mounted in Our
30 mm Cage System Using SM1A3 Adapter

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Interactive Selection Guide

RMS-Threaded Optical Component Adapters

This page contains all of our Optical Component Thread Adapters that feature RMS (0.800"-36) threading. Adapters featuring either internal or external threads are available.

Our RMS 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.

For use with microscope objectives, we recommend our brass microscope objective threading adapters; the brass construction is harder than aluminum which reduces thread binding.

Adapters with External RMS and Internal Industry-Standard Threads
Item # Typical Application External Threads Internal Threads
SM05RMS info Create Objective from SM05 Lens Tube RMS (0.800"-36) SM05 (0.535"-40)
RMSA2
info
 Integrate M25 x 0.75 Objective with
RMS Mount		 RMS (0.800"-36) M25 x 0.75
RMSA6
info
 Integrate Camera Lens to Microscope RMS (0.800"-36) C-Mount (1.00"-32)
SM1A4
info
 Create Objective from
SM1 Lens Tube		 RMS (0.800"-36) SM1 (1.035"-40)
SM1A4TSa
info
 Create Objective from
SM1 Lens Tube		 RMS (0.800"-36) SM1 (1.035"-40)
SM1BC
info
 Create Objective from
SM1 Lens Tube		 RMS (0.800"-36) SM1 (1.035"-40)
RMSA4
info
 Integrate M27 x 0.75 Objective with RMS Mount RMS (0.800"-36) M27 x 0.75
RMSA10
info
 Attach M32 x 0.75 Objective to RMS Mount RMS (0.800"-36) M32 x 0.75
RMSA12
info
 Integrate M62 x 0.75 System with RMS Mount RMS (0.800"-36) M62 x 0.75
  • Thermally insulating adapter. See the Thermal Insulation tab above for more information
Adapters with Internal RMS and External Industry-Standard Threads
Item # Typical Application External Threads Internal Threads
RMSA1
info
 Mount RMS Objective in M25 x 0.75 Mount M25 x 0.75 RMS (0.800"-36)
RMSA5
info
 Mount RMS Objective to Camera C-Mount (1.00"-32) RMS (0.800"-36)
SM1A3
info
 Mount RMS Objective to SM1 Lens Tube SM1 (1.035"-40) RMS (0.800"-36)
SM1A3TSa
info
 Mount RMS Objective to SM1 Lens Tube SM1 (1.035"-40) RMS (0.800"-36)
RMSA7
info
 Integrate RMS Objective with M26 x 0.706 Mount M26 x 0.706 (36 TPI) RMS (0.800"-36)
RMSA3
info
 Mount RMS Objective in M27 x 0.75 Mount M27 x 0.75 RMS (0.800"-36)
RMSA9
info
 Attach RMS Objective to M32 x 0.75 Mount M32 x 0.75 RMS (0.800"-36)
M32RMSSb
info
 Attach RMS Objective to M32 x 0.75 Mount M32 x 0.75 RMS (0.800"-36)
RMSA8
info
 Mount RMS Microscope Objective to SLR Camera Using M42 x 1.0 to SLR Bayonet Mount Adapter M42 x 1.0 RMS (0.800"-36)
SM2A32
info
 Integrate RMS Objective
into SM2 Lens Tube		 SM2 (2.035"-40) RMS (0.800"-36)
  • Thermally insulating adapter. See the Thermal Insulation tab above for more information
  • This brass adapter has a flange to prevent overthreading the adapter or the objective into a microscope nosepiece. Brass is harder than aluminum which reduces thread binding.
Adapter with Internal RMS and Internal Industry-Standard Threads
Item # Typical Application Internal Threads Internal Threads
RMSA11
info
 Mount RMS Objective in an
M62 x 0.75 System		 M62 x 0.75 RMS (0.800"-36)

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"
Thermal Stability of Al and Delrin Adapters
Click to Enlarge
Legend
Reflectance Heated SM1 Lens Tube with Aluminum Adapter Reflectance Heated SM1 Lens Tube with Delrin® Adapter
Reflectance Unheated SM1 Lens Tube with Aluminum Adapter Reflectance Unheated SM1 Lens Tube with Delrin® Adapter

Thermal Insulation Experiment

An experiment was conducted to compare the thermal isolation of our thermally insulating adapters (SM1A4TS, SM1A9TS, SM1A3TS, and SM1A10TS) presented at the bottom of this page with that of our traditional aluminum adapters. During the experiment, an aluminum adapter and a thermally isolating black Delrin®* adapter were each used to connect two lens tubes. Then, one of the lens tubes was externally heated to 60 °C using a foil heating element that had been attached to that lens tube’s outer surface.

During the heating process, simultaneous temperature readings were recorded in 30 second intervals for both the heated and unheated lens tube in each system. The measured results are shown in the plot to the right. From the graph, it is clearly evident that there is far less heat transfer when using one of our thermally isolating adapters to connect two lens tubes than exists when using an aluminum adapter.

*Delrin is a registered trademark of DuPont Polymers, Inc.

Selection Guide for Thermally Insulating Adapters
Item # Adapter Profile External Threads Internal Threads
SM1A4TS icon RMS (0.800"-36) SM1 (1.035"-40)
SM1A9TS icon C-Mount (1.00"-32) SM1 (1.035"-40)
SM1A3TS icon SM1 (1.035"-40) RMS (0.800"-36)
SM1A10TS icon SM1 (1.035"-40) C-Mount (1.00"-32)

Posted Comments:
johsieh1  (posted 2014-08-22 13:44:26.63)
Hi, I recently received the objective adapter RMSA3 and tried it on our microscope. It does what it supposed to do, mounting a RMS-treaded objective to a M27-treaded microscope turret. However, as the M27 is wider than RMS in size, the objective will not stop at certain depth but continue to advance (until falling off the tread) inside the turret. The objective could not be locked; it was slightly loose in fitting and would move by touch, which makes the center alignment between objectives impossible. I wonder if you would have any adapter that has a thread-locking function at the M27 side that would only go in at a fixed distance? (e.g. join a flat washer on one side of the adapter) Thank you. Jo Hsieh johsieh1@gmail.com
cdaly  (posted 2014-08-26 09:35:27.0)
Response from Chris at Thorlabs: At the moment, we do not have an M27 to RMS adapter with a shoulder to prevent it from threading too deep, but it is possible to achieve this by using two adapters, SM1A18(M27x0.75 to SM1)and SM1A3(SM1 to RMS).

Adapters with External RMS (0.800"-36) 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
SM05RMS Support Documentation
SM05RMSAdapter with External RMS Threads and Internal SM05 Threads
$17.59
Today
RMSA2 Support Documentation
RMSA2Customer Inspired! Adapter with External RMS Threads and Internal M25 x 0.75 Threads
$26.21
Today
SM1A4 Support Documentation
SM1A4Adapter with External RMS Threads and Internal SM1 Threads
$25.65
Today
SM1A4TS Support Documentation
SM1A4TSCustomer Inspired! Thermally Insulating Adapter with External RMS Threads and Internal SM1 Threads
$25.41
Today
RMSA4 Support Documentation
RMSA4Customer Inspired! Adapter with External RMS Threads and Internal M27 x 0.75 Threads
$25.04
Today
SM1BC Support Documentation
SM1BCExtended-Length Adapter with External RMS Threads and Internal SM1 Threads
$45.42
5-8 Days
RMSA10 Support Documentation
RMSA10Customer Inspired! Adapter with External RMS Threads and Internal M32 x 0.75 Threads
$26.21
Today
RMSA12 Support Documentation
RMSA12Customer Inspired! Adapter with External RMS Threads and Internal M62 x 0.75 Threads
$29.69
Today

Adapters with Internal RMS (0.800"-36) 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
RMSA1 Support Documentation
RMSA1Customer Inspired! Adapter with External M25 x 0.75 Threads and Internal RMS Threads
$22.59
Today
SM1A3 Support Documentation
SM1A3Adapter with External SM1 Threads and Internal RMS Threads
$19.43
Today
SM1A3TS Support Documentation
SM1A3TSCustomer Inspired! Thermally Insulating Adapter with External SM1 Threads and Internal RMS Threads
$25.41
Today
RMSA3 Support Documentation
RMSA3Customer Inspired! Adapter with External M27 x 0.75 Threads and Internal RMS Threads
$25.04
Today
RMSA9 Support Documentation
RMSA9Customer Inspired! Adapter with External M32 x 0.75 Threads and Internal RMS Threads
$26.21
Today
M32RMSS Support Documentation
M32RMSSCustomer Inspired! Brass Microscope Adapter with External M32 x 0.75 Threads and Internal RMS Threads
$27.26
Today
RMSA8 Support Documentation
RMSA8Customer Inspired! Adapter with External M42 x 1.0 Threads and Internal RMS Threads
$23.75
Today
SM2A32 Support Documentation
SM2A32Adapter with External SM2 Threads and Internal RMS Threads
$29.69
Today

Adapters with Internal RMS (0.800"-36) 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
RMSA11 Support Documentation
RMSA11Customer Inspired! Adapter with Internal M62 x 0.75 Threads and Internal RMS Threads
$29.69
Today
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