► SM2 (2.035 "- 40) internal thread, used for O2 inch optical element or lens sleeve;
► SM-R2 can be installed with optical elements with a maximum thickness of 9.5mm;
► SM-R2A can be installed with optical elements up to 9.0mm thick;
► M4 threaded mounting hole at the bottom for installing Oeabt series extension rod;
Optical commonly used thread size standard
This is the unique thread of Thorlabs in the United States, not the commonly used optical thread. SM is the code for the thread of the sewing machine in terms of thread expression, but this company in the United States uses it to connect the internal and external threads of the optical lens and the sleeve. The nature of the thread is UNS, and the United States has a special thread with a tolerance accuracy of 2A / 2B. The special place of this thread is 40 teeth per inch regardless of the diameter.
The specific dimensions are as follows:
(1) SM-R2 series fixed mounting base with SM2
(2.035 "- 40) internal thread is used to install Ø 2-inch optical element or lens sleeve with external thread. The mounting base has full thread and half thread options, and the attached snap ring is used to fix the optical elements.
(2) SM-R2 is SM2 (2.035 "- 40) half thread, which can install optical elements with a maximum thickness of 9.5mm. The SM-R2A is SM2 (2.035 "- 40) full thread, which can install optical elements with a maximum thickness of 9.0mm.
(3) The M4 threaded hole at the bottom is convenient for installation to Ø 12mm stainless steel extension rod for free space. At the same time, we also have SM-R1 Ø 1-inch fixed mounting base to choose from.
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