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 5930-01-083-7276
NSN 5925-01-237-3886
NSN 6130-00-936-1921
NSN 6240-00-087-0226
NSN 6145-00-840-6685
NSN 5990-00-674-2318
NSN 6320-00-937-5625
NSN 6620-01-323-5275
NSN 6645-00-947-0625
NSN 5999-01-578-6827
NSN 5935-01-181-5363
NSN 6145-01-519-1838