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 5920-01-442-4937
NSN 4140-01-614-7485
NSN 5965-00-959-4910
NSN 6240-00-553-8891
NSN 6240-00-099-8606
NSN 2925-01-387-0870
NSN 6110-01-578-7369
NSN 5975-01-343-3517
NSN 5895-00-552-1259
NSN 5910-00-824-2456
NSN 5996-01-536-6982
NSN 6105-01-056-4473