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 5999-00-549-5158
NSN 5950-01-374-9354
NSN 6650-01-074-8232
NSN 5950-00-136-6371
NSN 6110-00-424-4557
NSN 4140-01-392-2107
NSN 5925-01-322-9473
NSN 6150-01-528-7719
NSN 6105-00-244-1729
NSN 6650-00-030-2257
NSN 5950-00-601-6072
NSN 5915-01-023-7674