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 5965-01-093-0642
NSN 6650-00-992-4540
NSN 5925-01-185-5436
NSN 6105-00-840-6433
NSN 5975-01-521-3635
NSN 5965-00-378-3403
NSN 5999-01-538-2381
NSN 2925-00-510-0760
NSN 6610-01-549-4960
NSN 6105-00-273-1106
NSN 6150-01-012-5204
NSN 5855-00-941-6412