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 5915-01-501-5895
NSN 5975-01-107-8345
NSN 5930-01-551-1245
NSN 6320-01-183-8196
NSN 5930-01-183-3457
NSN 6150-01-607-6717
NSN 5990-00-116-1919
NSN 6135-01-370-9441
NSN 6610-01-469-6235
NSN 6220-00-553-8938
NSN 6645-01-365-1511
NSN 6110-01-005-5140