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 6110-01-481-4480
NSN 6145-01-265-3807
NSN 6145-01-242-2822
NSN 6610-01-446-7635
NSN 5998-00-270-1179
NSN 4140-01-600-6117
NSN 5945-01-288-5631
NSN 5990-00-934-3145
NSN 5925-01-462-6172
NSN 5996-01-485-7918
NSN 6110-01-441-4091
NSN 4140-00-474-9973