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 6645-01-322-8897
NSN 5999-01-490-5382
NSN 5915-01-597-3926
NSN 6645-01-606-2164
NSN 6150-01-334-7077
NSN 5945-01-202-9666
NSN 5960-01-408-8263
NSN 5930-01-503-7412
NSN 6320-01-409-1388
NSN 5935-00-577-8846
NSN 6650-00-272-2271
NSN 5895-01-310-9814