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 5925-01-512-2268
NSN 5835-01-060-3618
NSN 6610-01-474-5206
NSN 5960-00-881-0423
NSN 6650-01-086-5392
NSN 5996-00-050-6570
NSN 6105-01-004-7890
NSN 5855-01-100-3272
NSN 6110-00-631-3067
NSN 5935-01-337-6086
NSN 5950-00-413-7644
NSN 5960-00-156-5603