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 6220-01-131-9239
NSN 5895-01-188-7227
NSN 2925-01-464-3093
NSN 6150-01-399-7843
NSN 7035-01-466-1577
NSN 5975-01-588-4141
NSN 5950-00-201-5110
NSN 6145-01-507-1873
NSN 6135-00-223-9563
NSN 5996-01-037-8740
NSN 5990-01-166-2237
NSN 5999-00-325-4525