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 5960-01-471-2656
NSN 6150-01-106-3467
NSN 6135-01-633-8502
NSN 5905-01-030-4250
NSN 6135-01-424-1114
NSN 6130-00-837-2409
NSN 4140-01-575-3040
NSN 4140-01-645-5625
NSN 6145-01-234-1601
NSN 6150-01-333-3470
NSN 5945-01-015-2964
NSN 6105-01-656-6348