Optical Component Threading Adapters with SM1 (1.035"-40) Threads

Integrate SM1-Threaded Components with Other Industry-Standard Threads
Adapters Available with Either Internal or External SM1 Threads

SM1T2

External SM1 Threads with Locking Nuts

SM1A4

External RMS Threads and Internal SM1 Threads

SM1A6

External SM1 Threads and Internal SM05 Threads

SM1A10Z Adapter Connecting an MVL4WA C-Mount Lens to the SM1-Threaded Aperture of a Zelux^® Camera

CS165MU

SM1A10Z

MVL4WA

Please Wait

Overview
Specs
Thermal Insulation
Threading Specs
Feedback

SM1-Threaded Optical Component Adapters

This page contains all of our Optical Component Thread Adapters that feature SM1 (1.035"-40) threading. Adapters that have both internal and external threads are available, as well as adapters with two sets of internal threads or two sets of external threads.

For use with microscope objectives, we recommend our brass microscope objective threading adapters. They feature a lip to prevent the microscope objective from being threaded too far onto the mount, and their brass construction is harder than aluminum and less likely to bind to and damage the objective threading.

Our SM1 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 SM1 and Internal Industry-Standard Threads
Item #	Typical Application		External Threads	Internal Threads
SM1A6		Step Up/Down Lens Tube Size	SM1 (1.035"-40)	SM05 (0.535"-40)
SM1A6T		Mount Thin Ø1/2" Optics in SM1 Lens Tube	SM1 (1.035"-40)	SM05 (0.535"-40)
SM1A6FW		Mount SM05 Lens Tube to an SM1-Threaded Filter Wheel	SM1 (1.035"-40)	SM05 (0.535"-40)
SM1A3		Mount RMS Objective to SM1 Lens Tube	SM1 (1.035"-40)	RMS (0.800"-36)
SM1A3TS^a		Mount RMS Objective to SM1 Lens Tube	SM1 (1.035"-40)	RMS (0.800"-36)
SM1A12		Mount Scan Lens to SM1 Lens Tube	SM1 (1.035"-40)	M25 x 0.75
SM1A10		Mount CS-Mount Camera Lens to Zelux^® Camera	SM1 (1.035"-40)	C-Mount^b(1.00"-32)
SM1A10TS^a		Mount Camera Lens to SM1 Lens Tube	SM1 (1.035"-40)	C-Mount^b(1.00"-32)
SM1A10A		Mount C-Mount Camera Lens to Kiralux^® and Quantalux^® Cameras	SM1 (1.035"-40)	C-Mount^b(1.00"-32)
DC-CS1		Mount Camera Lens to SM1 Lens Tube	SM1 (1.035"-40)	C-Mount^b(1.00"-32)
SM1A10Z^c		Mount C-Mount Camera Lens to Zelux Camera	SM1 (1.035"-40)	C-Mount^b(1.00"-32)
SM1A24		Attach M25.5 x 0.5 Filters to SM1 Lens Tube	SM1 (1.035"-40)	M25.5 x 0.5
SM1A27		Attach W26 x 0.706 Objective to SM1 Lens Tube	SM1 (1.035"-40)	W26 x 0.706
SM1A35		Attach M27 x 0.5 Objective Lens to SM1 Lens Tube	SM1 (1.035"-40)	M27 x 0.5
SM1A17		Mount M27 x 0.75 Objective to SM1 Lens Tube	SM1 (1.035"-40)	M27 x 0.75
SM1A55		Mount M27 x 1.0 Component to SM1 Lens Tube	SM1 (1.035"-40)	M27 x 1.0
SM1A16		Step Up/Down Lens Tube Size	SM1 (1.035"-40)	SM30 (M30.5 x 0.5)
SM1A70		Mount SM30 Scan Lens to SM1 Galvo Scan Head	SM1 (1.035"-40)	SM30 (M30.5 x 0.5)
SM1A34		Attach M32 x 0.75 Objective to SM1 Lens Tube	SM1 (1.035"-40)	M32 x 0.75
SM1A37		Mount Camera Lens to SM1 Lens Tube	SM1 (1.035"-40)	M34 x 0.5
SM1A61		Mount IR Lens to SM1 Lens Tube	SM1 (1.035"-40)	M34 x 0.75
SM1A56		Mount M35 x 0.5 Component to SM1 Lens Tube	SM1 (1.035"-40)	M35 x 0.5
SM1A69		Step Up/Down Lens Tube Size	SM1 (1.035"-40)	SM1.5 (1.535"-40)
TMA1		Mount Camera Lens to SM1 Lens Tube	SM1 (1.035"-40)	T-Mount (M42 x 0.75)
SM1A48		Mount Camera Lens to SM1 Lens Tube	SM1 (1.035"-40)	M42 x 1.0
SM1A2		Step Up/Down Lens Tube Size	SM1 (1.035"-40)	SM2 (2.035"-40)
SM3A1		Step Up/Down Lens Tube Size	SM1 (1.035"-40)	SM3 (3.035"-40)

Thermally insulating adapter. See the Thermal Insulation tab above for more information.
This adapter uses C-mount (1.00"-32) threads. To optimize the image quality of a camera and lens system, an appropriate adapter must be selected to achieve the correct flange focal distance. See our full web presentation for more information.
This adapter provides the correct flange focal distance for mounting C-mount lenses to our Zelux^® cameras.

Adapters with Internal SM1 and External Industry-Standard Threads
Item #	Typical Application		External Threads	Internal Threads
SM1A1		Step Up/Down Lens Tube Size	SM05 (0.535"-40)	SM1 (1.035"-40)
SM1A4		Create Objective from SM1 Lens Tube	RMS (0.800"-36)	SM1 (1.035"-40)
SM1A4TS^a		Create Objective from SM1 Lens Tube	RMS (0.800"-36)	SM1 (1.035"-40)
SM1BC		Create Objective from SM1 Lens Tube	RMS (0.800"-36)	SM1 (1.035"-40)
SM1A11		Create Objective from SM1 Lens Tube	M25 x 0.75	SM1 (1.035"-40)
SM1A9		Mount a C-Mount Camera Body to an SM1 Lens Tube	C-Mount^b (1.00"-32)	SM1 (1.035"-40)
SM1A9TS^a		Mount a C-Mount Camera Body to an SM1 Lens Tube	C-Mount^b (1.00"-32)	SM1 (1.035"-40)
SM1A25		Attach Filters to Front of MVL Lens	M25.5 x 0.5	SM1 (1.035"-40)
SM1A28		Create Objective from SM1 Lens Tube	M26 x 0.706	SM1 (1.035"-40)
SM1A36		Integrate SM1 Lens Tube with M27 x 0.5 Mount	M27 x 0.5	SM1 (1.035"-40)
SM1A18		Create Objective from SM1 Lens Tube	M27 x 0.75	SM1 (1.035"-40)
SM1A54		Adapt M27 x 1.0 Component to SM1 Lens Tube	M27 x 1.0	SM1 (1.035"-40)
SM1A15		Step Up/Down Lens Tube Size	SM30 (M30.5 x 0.5)	SM1 (1.035"-40)
SM1A52		Adapt M30 x 1.0 Component to SM1 Lens Tube	M30 x 1.0	SM1 (1.035"-40)
SM1A33		Attach SM1 Lens Tube to M32 x 0.75 Mount	M32 x 0.75	SM1 (1.035"-40)
M32SM1S^c		Attach SM1 Lens Tube to M32 x 0.75 Mount	M32 x 0.75	SM1 (1.035"-40)
SM1A38		Mount Camera Body to SM1 Lens Tube	M34 x 0.5	SM1 (1.035"-40)
SM1A59		Adapt M34 x 0.75 Component to SM1 Lens Tube	M34 x 0.75	SM1 (1.035"-40)
SM1A57		Adapt M35 x 0.5 Component to SM1 Lens Tube	M35 x 0.5	SM1 (1.035"-40)
SM1A68		Step Up/Down Lens Tube Size	SM1.5 (1.535"-40)	SM1 (1.035"-40)
TMA2		Mount Camera Body to SM1 Lens Tube	T-Mount (M42 x 0.75)	SM1 (1.035"-40)
SM1A49		Mount Camera Body to SM1 Lens Tube	M42 x 1.0	SM1 (1.035"-40)
SM2A6		Step Up/Down Lens Tube Size	SM2 (2.035"-40)	SM1 (1.035"-40)

Thermally insulating adapter. See the Thermal Insulation tab above for more information.
This adapter uses C-mount (1.00"-32) threads. To optimize the image quality of a camera and lens system, an appropriate adapter must be selected to achieve the correct flange focal distance. See our full web presentation 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.

Adapters with External SM1 and External Industry-Standard Threads
Item #	Typical Application		External Threads	External Threads
SM05A3		Step Up/Down Lens Tube Size	SM1 (1.035"-40)	SM05 (0.535"-40)
SM1A39		Mount a C-Mount Camera Body to an Internally Threaded SM1 Lens Tube	SM1 (1.035"-40)	C-Mount^a (1.00"-32)
SM1T3		Mate Two Internally Threaded SM1 Lens Tubes	SM1 (1.035"-40)	SM1 (1.035"-40)
SM1T4		Mate Two Internally Threaded SM1 Lens Tubes	SM1 (1.035"-40)	SM1 (1.035"-40)
SM1T2		Mate Two Internally Threaded SM1 Lens Tubes	SM1 (1.035"-40)	SM1 (1.035"-40)
SM1A71		Step Up/Down Lens Tube Size	SM1 (1.035"-40)	SM2 (2.035"-40)

This adapter uses C-mount (1.00"-32) threads. To optimize the image quality of a camera and lens system, an appropriate adapter must be selected to achieve the correct flange focal distance. See our full web presentation for more information.

Adapter with Internal SM1 and Internal Industry-Standard Threads
Item #	Typical Application		Internal Threads	Internal Threads
SM1T1		Mate Two Externally Threaded SM1 Lens Tubes	SM1 (1.035"-40)	SM1 (1.035"-40)

Thermal Stability of Al and Delrin Adapters

Click to Enlarge

Legend
	Heated SM1 Lens Tube with Aluminum Adapter		Heated SM1 Lens Tube with Delrin^® Adapter
	Unheated SM1 Lens Tube with Aluminum Adapter		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 ^oC 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		RMS (0.800"-36)	SM1 (1.035"-40)
SM1A9TS		C-Mount (1.00"-32)	SM1 (1.035"-40)
SM1A3TS		SM1 (1.035"-40)	RMS (0.800"-36)
SM1A10TS		SM1 (1.035"-40)	C-Mount (1.00"-32)

Click to Enlarge

Threading Specifications

The following is a general overview of screw threading. For more details regarding specifications and dimensions, please consult the Machinery's Handbook, available for purchase at many bookstores.

Features of a Thread
A thread consists of three repeating features: a crest, flank, and root (see drawing to the right). Except in special cases, threads have symmetrical sides inclined at equal angles when a vertical line is drawn through the center of a crest or root. The distance between corresponding points on adjacent threads is known as the pitch of the thread. The flank angle is defined as the angle the flank makes with a perpendicular ray drawn from the screw axis. Unless otherwise stated, threads have a flank angle of 30°, resulting in a total angle between flanks of 60°. Each feature is shown in the diagram to the right.

The major diameter is taken from the crests of a thread while the minor diameter is taken from the roots. For most screws, crests and roots do not terminate at a sharp point, so crest and root truncation values are included in the definitions of major and minor diameter. The pitch diameter is approximately halfway between the major and minor diameters.

Thread Form
A thread form is a set of rules that define the features' scale relative to one another. Common thread forms include the Unified Screw Thread Form, used in the United States of America and measured in imperial units, and the ISO Metric Screw Thread Form, used in many parts of the world and measured with the International System of Units. There are many thread forms in the Unified screw thread standard designated by either UN, which defines a flat root contour, or UNR, which defines a round root contour. These can be further described by appending more letters. For example, an extremely fine thread with a flat root contour is designated UNEF. Those forms which are not standardized by the Unified screw thread system are designated UNS.

Thread Series
Most screws are identified by their thread series. Thread series are denoted by the major diameter and density of threads. Unified threads specify density in threads per inch, while Metric threads specify the thread pitch. For example, in the Unified nomenclature, a 1/4"-20 cap screw has a 1/4" diameter barrel and the pitch is 20 threads per inch (TPI). In metric nomenclature, an M4 x 0.7 cap screw has a 4 mm barrel and the pitch is 1 thread per 0.7 mm. The term M4 x 0.7 is often shortened to just M4.

Unified Thread Class Tolerancing
Location	Loose	Optimal	Strict
Internal	1B	2B	3B
External	1A	2A	3A

Metric Thread Tolerance Positions
Location	Loose	Optimal	Strict
Internal	-	G	H
External	e or f	g	h

Metric Thread Tolerance Grades
Dimension	Location	Tolerance Grades^a
Minor Diameter	Internal	4, 5, 6, 7, 8
Major Diameter	External	4, 6, 8
Pitch Diameter	Internal	4, 5, 6, 7, 8
Pitch Diameter	External	3, 4, 5, 6, 7, 8, 9

The tolerance becomes looser as the grade increases. The underlined grades are used with normal lengths of thread engagement.

Thread Class
The tolerances and allowances on a thread series are given by a thread class. Unified thread classes are alphanumeric identifiers starting with a number from 1 through 3, where 1 is the loosest tolerance and 3 is the tightest, and either A for external threading or B for internal threading.

Metric threads have a slightly more complex tolerancing method that uses tolerancing grades, designated by a number 3 through 9; and tolerancing positions, which use letters e through h. Grades provide a measure of the tolerance itself: the smaller the number, the tighter the tolerance. Positions denote the distance of the tolerance from the pitch diameter. Uppercase positioning letters indicate internal threads while lowercase positioning letters indicate external threads.

Quoting from the Machinery's Handbook, 29th Edition, p. 1885: "To designate the tolerance class, the grade and position of the pitch diameter is shown first followed by that for the major diameter in the case of the external thread or that for the minor diameter in the case of the internal thread, thus 4g6g for an external thread and 5H6H for an internal thread. If the two grades and positions are identical, it is not necessary to repeat the symbols, thus 4g, alone, stands for 4g4g and 5H, alone, stands for 5H5H."

Thorlabs' SM Series Threads
Threading specifications for our SM threads, utilized in our lens tube and cage system components, are given below so that you can machine mating components to suit your application. Most SM series threads utilize a non-standard Unified thread form, indicated by the letters UNS, with a 30° flank angle and a thread class of 2A and 2B. The exception is our SM30 series thread, which is a Metric thread form with a 30° flank angle and a tolerance of 6H/6g. We also offer products with C-Mount and RMS threads, and the specifications for these threads are given below for reference. Please note that other manufacturers may have different tolerances for C-Mount and RMS 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 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, M30.5 x 0.5 – 6H/6g		Internal Thread, M30.5 x 0.5 – 6H/6g
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"

SM4 Threading: Ø4" Lens Tubes
External Thread, 4.035"-40 UNS-2A		Internal Thread, 4.035"-40.0 UNS-2B
Max Major Diameter	4.0337"	Min Major Diameter	4.0350"
Min Major Diameter	4.0286"	Min Pitch Diameter	4.0188"
Max Pitch Diameter	4.0175"	Max Pitch Diameter	4.0245"
Min Pitch Diameter	4.0131"	Min Minor Diameter (and 83.3% of Thread)	4.008"
Max Minor Diameter	4.0066"	Max Minor Diameter (and 64.9% of Thread)	4.014"

Posted Comments:

Tianling Niu (posted 2024-09-27 13:32:31.35)

Do you have any 1.25'' Dia mounted adaptor for SM1? Thank you! We bought 27050 U-band bessell 1.25'' Dia Mounted filter from chromic.

tdevkota (posted 2024-09-30 04:11:36.0)

Thank you for reaching out to Thorlabs. While we don’t have an SM1 mount for 1.25" optics, we suggest considering the SM2AD32 (SM2-Threaded Mounting Adapter for Ø32 mm Optics) paired with the SM1A2 Adapter (with external SM1 threads and internal SM2 threads). Although the 32mm internal thread isn’t an exact match for 1.25" (31.75mm) optics, it should still hold, as your optic will be larger than the retaining ring of the SM2AD32.

user (posted 2024-01-11 16:32:52.393)

SM1A27 is missing from the table https://www.thorlabs.com/navigation.cfm?guide_id=2327 please add.

jdelia (posted 2024-01-12 10:55:47.0)

Thank you for contacting Thorlabs. SM1A27 is in fact not missing from the table you have linked. You just need to click on the blue "i" icon under SM1 external threads and M26 x 0.706 internal threads (thus matching the threads on the SM1A27). Clicking on this will open up a window containing the information and specifications regarding SM1A27.

user (posted 2023-06-12 14:46:50.243)

Is the M35 x 0.5 thread (component SM1A57) compatible with M35.5 x 0.5 threads (such as the filter threads on camera lens MVL12M1)? These threads do not appear to be compatible based on the thread spec's, but maybe you know better than I do. If they are not compatible, it would be helpful to have an M35.5 x 0.5 adapter to SM1 or SM2 threads. Many machine vision camera lenses have M35.5 x 0.5 filter threads (Thorlabs sells some of these lenses), and I would like to adapt this filter thread to SM1 or SM2 threads to connect to other optical systems.

jpolaris (posted 2023-06-15 03:03:44.0)

Thank you for contacting Thorlabs. We do not recommend using M35 x 0.5 thread adapters such as SM1A57 on components with M35.5 x 0.5 threads such as those on MVL12M1. While the threads may match for the first few rotations, there would be a risk of damaging both components. Metal shavings may also be left behind if this is attempted. This will be brought up with our design team.

Nadir Shah (posted 2021-03-08 13:10:22.67)

What is the bore size shall I define for SM1A1 threads, if I want to run the SM1A1 tap. Thanks Nadir

YLohia (posted 2021-03-12 04:02:20.0)

Hello Nadir, what thread are you specifically referring to? Internal SM1 or external SM05? The SM1A1 is an adapter -- it is not a single thread type or a tap.

Hong-Ruei Chen (posted 2021-03-08 23:08:36.607)

Hi, Could you provide the specification of the SM series thread such as the thread pitch, thread angle, and manufacturing tolerance, etc?

YLohia (posted 2021-03-09 11:20:26.0)

Hello, please see the "Threading Specs" tab on this page. The tolerances depend on if the threads are Class 2 or Class 3, but are based on the Unified Series Thread Standards. For example, our SM05 external threads are listed as "External Thread, 0.535"-40.0, UNS-2A". The pitch is 40 TPI while the tolerances are governed by the UNS-2A class. The thread angle is 60 degrees for all of our UNS threads (including SM-series threads).

YLohia (posted 2021-01-29 10:59:35.0)

Tristan Haldane (posted 2020-12-15 05:04:56.24)

Is SM30 = c-mount thread? If so, why on earth don't you say so? You have other adapters labelled as c-mount. It would have saved me a lot of time if you'd mentioned it anywhere!

YLohia (posted 2020-12-15 02:39:48.0)

Thank you for contacting Thorlabs. The SM30 thread is specified as M30.5 x 0.5 thread while the C-mount thread is 1.00"-32. Please refer to the Specs tab. These are not the same type and are not cross-compatible.

Ray Harwood (posted 2020-07-25 20:07:54.34)

Can you help me? I’ve got a very similar retaining ring on an automotive mirror, being plastic with extremely narrow slots. Nothing I’ve tried will budge the ring. Can you point me to a tool that will fit something like this? At the moment I don’t have the specific diameter of the ring, but if there’s hope, I’ll measure!

llamb (posted 2020-07-29 04:15:33.0)

Hello, thank you for contacting Thorlabs. If your retaining ring appears similar to our SM1A3 adapter, then our SPW801 adjustable spanner wrench is our best option for a tool to help remove the retaining ring.

万和李 (posted 2020-06-12 22:17:02.917)

The surface of SM1A9 is designed only for hand operation which can adapt to most conditions. But when it is screwed too tightly, we need wrench like SPW502 to help this, while there is no place for SPW502. So I am wondering if you can reconsider this problem.

llamb (posted 2020-06-15 03:42:32.0)

Thank you for your feedback. We will consider this product suggestion. For the time being, you can also consider our TGP1 soft-jaw pliers to better grip the SM1A9 or your mating parts.

user (posted 2019-06-21 14:07:01.34)

We are interested in mounting RMS-thread objectives to the SM1 system. This almost works for us, but we are not interested in thermal isolation but do care about stability. A similar part made of metal (something along the lines of M32RMSS) would be much better.

YLohia (posted 2019-06-21 03:20:24.0)

Hello, we offer the SM1A3 on this page, which is made of anodized aluminum and doesn't have any special thermal isolation features.

dukhyunglee (posted 2018-10-10 22:42:53.517)

I need 'Adapter with External RMS Threads and Internal M26 x 0.706'

YLohia (posted 2018-10-11 10:11:45.0)

Hello, thank you for contacting Thorlabs. I will reach out to you directly to discuss the possibility of offering this adapter.

vi (posted 2018-01-20 16:22:15.673)

Dear Sir or Madam, I am looking for adapter SM1 female (optical filter mount) to 1.25" male, which is M28.5 x 0.6 1.25" is commonly used in astronomy. Can you make a new catalog part? Best Regards, Vassili

tfrisch (posted 2018-03-21 04:54:16.0)

Hello, thank you for contacting Thorlabs. Yes, we are able to offer custom thread adapters, but we would need you to provide a mating piece we can use as a part of the inspection and quality control process. I will reach out to you directly about your application.

luciano.olivo (posted 2017-10-18 09:07:31.66)

This adapter could be used to mount one 1" or 25mm diameter filter on a Kowa LM50JCM camera but the internal thread is not deep enough (only 3.3mm) for both a filter and a threaded retaining ring, I had to glue the filter to the adapter. A deeper internal thread, 7mm depth (2mm for the ring and 5mm for one or two filters)would be useful for similar applications. Thanks and best regards. Luciano Olivo Ergolines LAB S.r.l.

tfrisch (posted 2017-12-06 02:08:11.0)

Hello, Luciano. Thank you for your feedback. SM1A36 (ext M27x0.5 to in SM1) could be used with a short lens tube in order to provide the needed internal thread. For example SM1L03 has 7.6mm of thread depth. If you don't want to glue optics in the future, this may be helpful in your application.

cafortin (posted 2015-11-13 15:15:42.977)

Hi, I would like to adapt line scanning cameras with large 16K sensors for machine vision that use M95x1.0 threads with Thorlabs SM2/SM3 tubing and caging system. Is this in Thorlabs' plan to develop adapters with M95x1.0 threads?

jlow (posted 2015-11-20 10:08:40.0)

Tyler Morgus: Thank you for the adapter request. Thorlabs can add this adapter to our product line. I will contact you to get the details on the internal/external threading combination that you need. Tyler, Thorlabs Optomechanics Group

etienne (posted 2014-10-24 13:18:01.283)

Can't open part document (.sldprt) for SM1A39 with SolidWorks version 11.9.0.0. I get a "Cannot Open... Future Version" error message. Other part documents open without problem. Could you please make SM1A39-Solidworks.sldprt compatible with older versions, like almost all other Thorlabs parts? Thanks.

jlow (posted 2014-11-06 01:52:14.0)

Response from Jeremy at Thorlabs: SolidWorks do not allow saving for a previous version. However, you should be able to download the STEP file and open that in your current version of SolidWorks.

severin.filser (posted 2013-12-06 11:31:12.82)

Dear Sir or Madama, do you sell adapters to mount a Nikon objective (http://objectives.nikoninstruments.com/compare.php?c[]=81) to a Zeiss LSM 7MP 2-photon-microscope? Thank you very much, Severin Filser

pbui (posted 2013-12-12 03:38:51.0)

Response from Phong at Thorlabs: The N40X-NIR Nikon objective has M25 x 0.75 external threads while your Zeiss microscope has M27 x 0.75 internal threads. We can manufacture a custom thread adapter for you and will contact you to discuss this further.

michaelorger (posted 2013-10-15 02:40:10.923)

I am wondering how easy it would be for you to make an M34x1 (internal) to SM2 (internal or external) adaptor?

cdaly (posted 2013-10-17 14:54:00.0)

Response from Chris at Thorlabs: Thank you for your inquiry. We may be able to provide this one for you as a custom. We do already make adapters with use each one of these threads currently. I will contact you directly to discuss this further.

user (posted 2013-09-05 11:16:34.873)

It would be useful to have an adapter to convert external SM1 thread to external SM05 thread.

cdaly (posted 2013-09-11 16:02:00.0)

Response From Chris at Thorlabs: Thank you for your feedback. Our adapter SM1A1 has internal SM1 threads with external SM05 threads. If you would like to mate two components which have both external SM1 and SM05 threads, the SM1A1 adapter can be used with an SM05T1 to provide the necessary threading. If you would like the adapter to have external threading on both sides in order to mate two internally threaded components, this can be done by using the SM1A1 with the SM1T2 lens tube coupler.

tony.hainsworth (posted 2013-03-07 15:57:28.31)

Hi, I am looking for a part similar to the SM1A9, but with both camera and SM1 tube threads external. We have actually had and used two parts just like this but need more now. I am sure we got them bundled with the CMOS cameras we bought from you but I just cannot find this part listed separately. Tony

cdaly (posted 2013-03-07 09:54:00.0)

Response from Chris at Thorlabs: Thank you for your feedback. We do not have a single adapter which has external threads for both C-Mount and SM1, but if you thread an SM1T2 lens tube coupler into the SM1A9 adapter, you can create the desired adapter.

cdaly (posted 2012-11-27 18:25:00.0)

Response from Chris at Thorlabs: Thank you for using our feedback feature. At the moment, we do not currently have M28 thread adapters, but we are always expanding our line of products. I have submitted your request within our internal forums and it will be considered for release by our design engineers.

dongyoung.kim (posted 2012-11-21 20:03:00.523)

Do you happen to have M28 to C-mount adopter in the future? I know it is not a common thread (M28), but some ZEISS part use M28 threads and I really need it... Thank you!

jlow (posted 2012-11-06 15:38:00.0)

Response from Jeremy at Thorlabs: We do not currently have an adapter for M55 thread. We will get in contact with you directly to discuss about this further.

jrestrep (posted 2012-10-24 16:27:08.64)

Hello, this is more of a question. Are there any SM2 external / M55 internal adapters?. Thanks.

tcohen (posted 2012-09-06 15:11:00.0)

Response from Tim at Thorlabs: We have been increasing our selection of adapters and as you will notice many of them have been customer inspired. Thank you for providing your feedback as we continue to increase our selection.

cafortin (posted 2012-09-05 15:34:53.0)

For future product: External M27x1.0 to Internal SM1. It would be very practical to fit Standa.lt products.

bdada (posted 2011-12-16 14:48:00.0)

Response from Buki at Thorlabs: Thank you for your feedback and your interest in our optomechanical adapters. We will consider your request as we continue to expand our selection of adapters. As an alternative solution, please consider combining the following two products to get an overall effect of external SM05 and RMS threads: SM05T2 - SM05 (Ø0.535"-40) Coupler, External Threads http://www.thorlabs.com/thorProduct.cfm?partNumber=SM05T2 SM05RMS - Adapter with External RMS Threads and Internal SM05 Threads http://www.thorlabs.com/thorProduct.cfm?partNumber=SM05RMS

petersog (posted 2011-12-16 11:00:44.0)

For future product: External RMS to External SM05.

user (posted 2011-11-28 21:14:07.0)

A response from Tyler at Thorlabs: I looked at all the SM1A25 drawing files and they appear to be correct. Can you contact us with more information about the problem that you experienced. As a double check, the design engineer is looking at the files. If they find a mistake it will be fixed and updated on our server by tomorrow morning. Thank you for helping us improve the quality of our website.

user (posted 2011-11-23 15:40:48.0)

The solidworks file for SM1A25 is not correct, or the part number is not correct.

bdada (posted 2011-10-04 19:37:00.0)

Response from Buki at Thorlabs: Thank you for your feedback. We will work on improving the clarity of the table so it is easier to determine the different threads and mounts.

despinosa (posted 2011-10-04 10:59:16.0)

The table highlights (for determining which style of mount) on this page are a pretty subtle variation in brightness- might make it a little more obvious.

jjurado (posted 2011-08-03 11:41:00.0)

Response from Javier at Thorlabs to halvorsen: Thank you very much for your feedback. We will consider the possibility of adding more thread depth to the M25x0.75 side of the SM1A12 adapter. I will contact you directly to discuss your requirements.

halvorsen (posted 2011-08-03 09:25:00.0)

Id just like to comment on the SM1A12. It would be nice if you could increase the length of the M25 threading, since Nikon objectives do not seat properly. I have to have the machine shop here modify these, which is a pain.

jjurado (posted 2011-07-08 10:31:00.0)

Response from Javier at Thorlabs to ajh: Thank you very much for your feedback! We will look into offering M27x0.5 adapters for use with our C-Mount DCC/DCU cameras and SM1-threaded components.I will contact you directly to keep you updated of the status of this project.

ajh (posted 2011-07-07 16:32:31.0)

Please consider adding adapters to this range to cover more of the filter threads used by your C-mount camera lenses, e.g. M27 x 0.5 which is used by a number of the Navitar lenses. Adaptors between these threads and SM1 (at least) would be useful for integrating cameras into lens tube and cage mount based optical systems. Your DCU and DCC cameras are small and light enough to be mounted via the lens in this way, and it can often be convenient to do so.

Buki at Thorlabs (posted 2011-01-26 13:57:38.0)

Thank you for your feedback. We have added the STEP file for the SM1A2.

flickingerd (posted 2011-01-24 16:02:23.0)

SM1A2 is missing STEP file.

technicalmarketing (posted 2007-12-19 16:50:53.0)

In response to acables request, we have added two links to the couplers page on this page (one in the overview tab and one in the first subgroup). We have also added a link to the couplers page under the related items link. Since the couplers page is quite extensive itself (i.e. 3 subgroups), it did not seem advisable to just add those products to this page, as it would make the page quite long. Thank you for taking the time to help us improve our web pages. We hope that these new links make it easier for you to find the couplers the next time you visit our site.

acable (posted 2007-12-12 10:12:00.0)

Please consider having the Lens Tube Couplers added to this page, ive looked for these a couple of time and always come back to this page to look for them.

Adapters with External SM1 (1.035"-40) Threads 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

SM1A6 Adapter with External SM1 Threads and Internal SM05 Threads, 0.15" Long

$22.82

Today

SM1A6T Customer Inspired! Adapter with External SM1 Threads and Internal SM05 Threads, 0.40" Long

$23.41

Today

SM1A6FW Adapter with External SM1 Threads and Internal SM05 Threads, Knurled Edge

$23.29

Today

SM1A3 Adapter with External SM1 Threads and Internal RMS Threads

$19.82

Today

SM1A12 Adapter with External SM1 Threads and Internal M25 x 0.75 Threads

$24.00

Today

SM1A3TS Customer Inspired! Thermally Insulating Adapter with External SM1 Threads and Internal RMS Threads

$25.92

Today

SM1A10 Adapter with External SM1 Threads and Internal C-Mount Threads, 4.1 mm Spacer

$22.26

Today

SM1A10TS Customer Inspired! Thermally Insulating Adapter with External SM1 Threads and Internal C-Mount Threads, 6.5 mm Spacer

$25.29

Today

SM1A10A Customer Inspired! Adapter with External SM1 Threads and Internal C-Mount Threads, 6.9 - 8.9 mm Spacer

$36.23

Today

DC-CS1 Adapter with External SM1 Threads and Internal C-Mount Threads, 7.42 mm Spacer

$32.37

Today

SM1A10Z Adapter with External SM1 Threads and Internal C-Mount Threads, 9.1 mm Spacer

$26.35

Today

SM1A24 Customer Inspired! Adapter with External SM1 Threads and Internal M25.5 x 0.5 Threads

$22.48

Today

SM1A27 Customer Inspired! Adapter with External SM1 Threads and Internal W26 x 0.706 Threads

$22.83

Today

SM1A35 Customer Inspired! Adapter with External SM1 Threads and Internal M27 x 0.5 Threads

$23.41

Today

SM1A17 Customer Inspired! Adapter with External SM1 Threads and Internal M27 x 0.75 Threads

$23.41

Today

SM1A55 Customer Inspired! Adapter with External SM1 Threads and Internal M27 x 1.0 Threads

$23.41

Today

SM1A16 Customer Inspired! Adapter with External SM1 Threads and Internal SM30 Threads, 0.29" Long

$24.92

Today

SM1A70 Adapter with External SM1 Threads and Internal SM30 Threads, 0.47" Long

$29.99

Today

SM1A34 Customer Inspired! Adapter with External SM1 Threads and Internal M32 x 0.75 Threads

$26.08

Today

SM1A37 Customer Inspired! Adapter with External SM1 Threads and Internal M34 x 0.5 Threads

$29.55

Today

SM1A61 Customer Inspired! Adapter with External SM1 Threads and Internal M34 x 0.75 Threads

$24.92

3 weeks

SM1A56 Adapter with External SM1 Threads and Internal M35 x 0.5 Threads

$31.78

Today

SM1A69 Adapter with External SM1 Threads and Internal SM1.5 Threads

$26.58

Today

TMA1	Customer Inspired! Adapter with External SM1 Threads and Internal T-Mount Threads

$26.08

Today

SM1A48 Adapter with External SM1 Threads and Internal M42 x 1.0 Threads

$26.73

Today

SM1A2 Adapter with External SM1 Threads and Internal SM2 Threads

$28.40

Today

SM3A1 Adapter with External SM1 Threads and Internal SM3 Threads

$35.35

Today

Adapters with Internal SM1 (1.035"-40) Threads 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

SM1A1 Adapter with External SM05 Threads and Internal SM1 Threads

$23.41

Today

SM1A4 Adapter with External RMS Threads and Internal SM1 Threads

$26.16

Today

SM1A4TS Customer Inspired! Thermally Insulating Adapter with External RMS Threads and Internal SM1 Threads

$25.92

Today

SM1BC Extended-Length Adapter with External RMS Threads and Internal SM1 Threads

$46.33

Today

SM1A11 Adapter with External M25 x 0.75 Threads and Internal SM1 Threads

$24.00

Today

SM1A9 Adapter with External C-Mount Threads and Internal SM1 Threads, 4.4 mm Spacer

$21.38

Today

SM1A9TS Customer Inspired! Thermally Insulating Adapter with External C-Mount Threads and Internal SM1 Threads, 6.5 mm Spacer

$25.29

Today

SM1A25 Customer Inspired! Adapter with External M25.5 x 0.5 Threads and Internal SM1 Threads

$22.48

Today

SM1A28 Customer Inspired! Adapter with External M26 x 0.706 Threads and Internal SM1 Threads

$22.83

Today

SM1A36 Customer Inspired! Adapter with External M27 x 0.5 Threads and Internal SM1 Threads

$23.41

Today

SM1A18 Customer Inspired! Adapter with External M27 x 0.75 Threads and Internal SM1 Threads

$23.41

Today

SM1A54 Customer Inspired! Adapter with External M27 x 1.0 Threads and Internal SM1 Threads

$24.00

Today

SM1A15 Customer Inspired! Adapter with External SM30 Threads and Internal SM1 Threads

$24.92

Today

SM1A52 Adapter with External M30 x 1.0 Threads and Internal SM1 Threads

$18.18

Today

SM1A33 Customer Inspired! Adapter with External M32 x 0.75 Threads and Internal SM1 Threads

$26.08

Today

M32SM1S Customer Inspired! Brass Microscope Adapter with External M32 x 0.75 Threads and Internal SM1 Threads

$37.89

Today

SM1A38 Customer Inspired! Adapter with External M34 x 0.5 Threads and Internal SM1 Threads

$29.55

Today

SM1A59 Customer Inspired! Adapter with External M34 x 0.75 Threads and Internal SM1 Threads

$24.92

Today

SM1A57 Adapter with External M35 x 0.5 Threads and Internal SM1 Threads

$31.02

Today

SM1A68 Adapter with External SM1.5 Threads and Internal SM1 Threads

$26.58

Today

TMA2	Customer Inspired! Adapter with External T-Mount to Internal SM1

$26.73

Today

SM1A49 Adapter with External M42 x 1.0 Threads and Internal SM1 Threads

$26.08

Today

SM2A6 Adapter with External SM2 Threads and Internal SM1 Threads

$29.10

Today

Optical Component Threading Adapters with SM1 (1.035"-40) Threads

SM1-Threaded Optical Component Adapters

Thermal Insulation Experiment

Threading Specifications

Adapters with External SM1 (1.035"-40) Threads and Internal Industry-Standard Threads

Adapters with Internal SM1 (1.035"-40) Threads and External Industry-Standard Threads

Adapters with External SM1 (1.035"-40) and External Industry-Standard Threads

Adapter with Internal SM1 (1.035"-40) and Internal Industry-Standard Threads