A cylindrical, externally threaded item having a centrally located hole specifically designed to retain by means of either a raised box (shoulder), or counterbore, countersink, or a similar shaped recess, an optical element such as a lens, reticle, cell, and the like, in optical assemblies. It must have drilled holes or slots to facilitate assembly and disassembly. For items which house the optical element(s), and form the internal or central portions of an optical system, see cell, optical element. Excludes ring, externally threaded.
Classification: Military equipments not identified by kind
NSN 2925-01-560-4123
NSN 5998-01-646-1051
NSN 6610-01-278-2446
NSN 4140-01-538-9660
NSN 4140-00-146-3269
NSN 5915-00-280-9082
NSN 6620-01-078-6372
NSN 5905-01-266-6778
NSN 2925-01-148-7646
NSN 6240-01-343-9367
NSN 2925-01-339-6972
NSN 5925-00-274-0130