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 5999-00-183-7687
NSN 5855-01-130-1501
NSN 5835-00-484-1330
NSN 6150-01-004-8788
NSN 5960-01-290-2604
NSN 6220-00-785-1713
NSN 5950-01-472-2467
NSN 6110-01-373-6096
NSN 6320-01-607-0347
NSN 6150-01-472-3918
NSN 6130-01-294-6121
NSN 6110-00-091-9436