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 5985-01-277-3293
NSN 5935-00-834-3373
NSN 6220-01-604-8043
NSN 6130-00-144-8018
NSN 5920-01-655-9955
NSN 6135-01-398-5922
NSN 6685-00-468-1853
NSN 5996-01-113-7960
NSN 5915-01-219-7068
NSN 6240-01-068-3491
NSN 6130-01-104-4371
NSN 5950-01-204-7340