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 5930-01-282-1214
NSN 5905-01-270-7327
NSN 5975-01-388-2603
NSN 5990-01-116-2181
NSN 5925-01-608-3822
NSN 6110-01-170-5379
NSN 6220-00-437-7851
NSN 5990-00-844-1188
NSN 6320-01-449-1014
NSN 6110-01-248-0056
NSN 5998-01-529-6471
NSN 2925-01-464-3093