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 5930-00-580-3085
NSN 6220-00-172-0146
NSN 6105-01-242-5545
NSN 5975-01-437-8869
NSN 2925-01-120-8712
NSN 5915-00-146-1234
NSN 5935-00-213-6875
NSN 6135-00-726-4142
NSN 5996-01-528-6576
NSN 5945-01-160-7894
NSN 5905-01-513-0996
NSN 5999-01-142-0480