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 5945-00-316-5300
NSN 6685-01-168-8194
NSN 5930-01-232-9603
NSN 6645-01-237-2568
NSN 5950-01-254-2699
NSN 6240-01-118-7624
NSN 7035-00-145-9138
NSN 5925-00-234-0211
NSN 5945-00-865-0375
NSN 6150-00-231-0249
NSN 5950-01-411-0849
NSN 5905-00-964-6655