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 6320-00-360-1744
NSN 6220-00-435-5867
NSN 5990-01-084-0807
NSN 5935-01-098-4429
NSN 5996-01-423-8452
NSN 6240-01-604-0419
NSN 6105-01-250-7348
NSN 5920-00-408-4423
NSN 5920-00-784-5214
NSN 6610-00-186-9180
NSN 5945-00-709-2053
NSN 5910-01-576-6634