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 5999-01-045-1862
NSN 5996-00-287-6366
NSN 5985-01-279-9957
NSN 6110-00-730-6272
NSN 5920-01-418-1821
NSN 5910-01-126-4146
NSN 5915-00-344-7480
NSN 5920-01-165-8480
NSN 5930-01-585-6530
NSN 5915-01-246-7498
NSN 5855-00-484-8638
NSN 5930-01-103-2642