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 5965-01-262-9608
NSN 6150-01-370-3227
NSN 4140-01-140-0197
NSN 5920-00-916-8350
NSN 5910-00-633-7743
NSN 5835-00-532-5910
NSN 5998-00-910-7654
NSN 5855-01-566-7431
NSN 7035-01-243-8523
NSN 6610-00-149-1534
NSN 5975-01-413-8351
NSN 6130-01-426-8841