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 5998-00-633-5169
NSN 6145-01-381-1419
NSN 6130-00-929-3922
NSN 6610-00-263-3076
NSN 6105-01-408-7868
NSN 6645-01-589-8406
NSN 6610-01-649-5326
NSN 5910-01-216-9065
NSN 6645-01-233-1131
NSN 4140-00-456-0902
NSN 5990-01-270-1015
NSN 5905-01-338-3468