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 5905-01-032-4681
NSN 6610-01-193-8861
NSN 4140-00-954-4695
NSN 5930-00-464-9776
NSN 6610-01-250-2811
NSN 5996-01-069-2915
NSN 6320-00-845-3261
NSN 5915-01-056-7411
NSN 6610-01-649-5326
NSN 7035-01-501-7259
NSN 6620-01-386-5914
NSN 5925-01-382-8021