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 5965-01-599-0799
NSN 4140-01-362-0047
NSN 5975-01-369-6746
NSN 6645-00-514-4017
NSN 5835-00-398-9678
NSN 6110-00-468-4842
NSN 5975-01-112-6062
NSN 5965-01-193-0420
NSN 6135-00-182-7008
NSN 5855-01-660-9717
NSN 6610-01-025-2876
NSN 6130-00-013-7866