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 5950-01-476-1190
NSN 2925-00-516-8841
NSN 5915-01-024-8200
NSN 6130-00-833-7763
NSN 5905-01-577-7167
NSN 5950-00-254-5905
NSN 5935-00-702-9256
NSN 5855-01-258-6180
NSN 6320-01-275-2741
NSN 5950-00-079-9665
NSN 6130-01-406-7385
NSN 5985-01-400-0882