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 5895-00-975-7638
NSN 5999-01-451-6499
NSN 5835-00-993-7957
NSN 5855-01-418-6303
NSN 5985-00-451-1338
NSN 6320-01-519-8767
NSN 6620-00-324-0930
NSN 6240-01-224-4125
NSN 6105-00-226-2185
NSN 5990-01-357-6175
NSN 5835-01-143-6841
NSN 5935-01-028-0524