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 6620-01-488-9547
NSN 6105-01-621-4319
NSN 5985-01-360-9051
NSN 5835-00-257-2852
NSN 6135-01-597-1901
NSN 5935-01-284-1802
NSN 6105-00-910-4499
NSN 6105-01-614-3120
NSN 6240-01-274-3494
NSN 5920-01-528-7196
NSN 5855-00-165-3093
NSN 6685-01-325-9848