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 6220-01-446-6430
NSN 5905-01-519-3666
NSN 7035-01-284-5043
NSN 5950-01-220-1996
NSN 6240-01-317-5747
NSN 6620-01-293-6241
NSN 5950-00-801-0934
NSN 5855-01-487-5048
NSN 6685-01-438-8999
NSN 6135-00-422-3967
NSN 6620-01-106-2814
NSN 5999-01-508-5646