SM-R1 Fixed Lens Mount

Product Description

• Compatible with various Ø1-inch (25mm) optical components.
• Can mount optical components with a maximum thickness of 7mm.
• SM1 (1.035”-40) internal threads, included with 1 standard SM1 retaining ring.
• M4 threaded mounting hole at the bottom for installing Oeabt series rods.

The SM-R1 fixed mount is compact and lightweight. It can mount Ø1-inch optical components up to 7mm thick, featuring SM1 internal threads and 1 included retaining ring for fixing optical components.

Specifications	SM-R1
Dimensions	37.3*30.4*10.2mm
Central Aperture	SM1 internal threads, compatible with 1-inch optical components
Thread Type	M4
Weight	8.9g
Material	7075 aluminum alloy

Technical Description

Optical Knowledge Point: Common Optical Thread Size Standards

This is a thread specific to Thorlabs Inc. (USA) and not a commonly used optical thread. “SM” is the code for sewing machine threads in thread notation, but this American company uses it for internal and external thread connections of optical lenses and sleeves. The thread type is UNS (Unified National Special Thread) with a tolerance class of 2A/2B. A unique feature of this thread is that regardless of the diameter, the pitch is 40 threads per inch (TPI). Specific dimensions are as follows:

Series	Type	Thread (in)	Nominal Diameter (mm)	Minor Diameter (mm)	Pitch Diameter (mm)	Major Diameter (mm)
SM05	Internal	0.535-40	13.59	12.98±0.07	13.24±0.05	＞13.59
SM05	External	0.535-40	13.59	＜12.78	13.10±0.05	13.50±0.05
SM1	Internal	1.535-40	26.29	25.68±0.07	25.95±0.05	＞26.29
SM1	External	1.535-40	26.29	＜25.48	25.79±0.05	26.19±0.06
SM2	Internal	2.535-40	51.69	51.08±0.075	51.35±0.075	＞51.69
SM2	External	2.535-40	51.69	＜50.87	51.18±0.05	51.59±0.05

Product Description

The SM-R1 fixed mount is compact and lightweight. It can mount Ø1-inch optical components up to 7mm thick, featuring SM1 internal threads and 1 included retaining ring for fixing optical components.

The M4 threaded hole at the bottom facilitates installation onto Ø12mm stainless steel rods for free-space applications. When used with the CS2 adjustable angle rod clamp, it can be freely deflected in experimental setups, greatly improving flexibility.

Assembly

Application Example

Oeabt offers a variety of optical adjustment mounts and fixed mounts capable of installing many standard-sized optical components. The fixed optical mount features an integrated design, which can be integrated into laser systems or other compactly designed systems, suitable for applications requiring high stability. It enables easy construction of optical experimental platforms in optical path systems.

 

Engineering Drawing Download

SM-R1 Engineering Drawing