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 6320-01-006-6138
NSN 6135-01-127-0173
NSN 6320-00-082-5868
NSN 6620-00-905-6590
NSN 6105-01-495-7548
NSN 5996-01-325-4159
NSN 5855-01-482-7900
NSN 5910-01-551-2537
NSN 5935-01-414-9261
NSN 6220-01-188-6962
NSN 4140-01-400-3610
NSN 2925-01-058-1718