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 5835-00-453-1969
NSN 5835-01-441-4746
NSN 6240-01-545-4554
NSN 6320-01-506-7497
NSN 6240-00-928-7181
NSN 5855-01-093-8202
NSN 6685-01-418-0925
NSN 5925-01-433-2535
NSN 5975-00-872-6131
NSN 6645-00-521-0353
NSN 6150-00-488-3726
NSN 5985-01-195-4028