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 5905-01-633-5290
NSN 5998-01-113-8808
NSN 6240-00-398-0740
NSN 5835-01-306-5511
NSN 6645-00-752-2939
NSN 5999-01-368-7867
NSN 6685-00-557-0760
NSN 7035-00-623-4744
NSN 6110-01-213-0210
NSN 5910-01-496-3230
NSN 5905-00-086-5462
NSN 6220-00-252-8025