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 5975-00-172-3175
NSN 5905-01-042-0531
NSN 4140-01-266-9019
NSN 5925-01-251-5590
NSN 6650-01-641-3804
NSN 6130-00-719-7219
NSN 5996-01-006-6346
NSN 6610-01-287-9814
NSN 5935-01-303-3604
NSN 5935-01-652-4494
NSN 5915-00-463-2562
NSN 5930-01-649-1517