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 5965-00-602-1508
NSN 6620-01-423-0833
NSN 5835-01-449-7511
NSN 5915-01-494-2586
NSN 4140-01-213-1941
NSN 5999-00-835-3784
NSN 5999-01-468-0803
NSN 5915-01-417-3123
NSN 6130-00-452-9464
NSN 5910-01-188-6365
NSN 5950-01-568-4943
NSN 6685-01-090-1203