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 5960-01-481-3722
NSN 7035-01-350-4247
NSN 5925-01-423-7803
NSN 5990-01-218-5160
NSN 7035-01-198-1512
NSN 5996-01-575-5349
NSN 5998-01-096-2930
NSN 6130-01-436-6397
NSN 6685-00-132-7891
NSN 6320-01-006-6138
NSN 4140-01-208-3660
NSN 5975-01-025-9990