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 5895-00-164-7146
NSN 6645-01-466-2083
NSN 5905-00-325-8476
NSN 6240-01-407-5690
NSN 6610-01-503-5656
NSN 5965-01-414-6414
NSN
NSN 6130-00-498-1131
NSN 5935-01-382-9587
NSN 6610-01-522-9882
NSN 6135-00-078-9931
NSN 6220-00-186-8565