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 5960-00-036-8187
NSN 5925-00-999-1710
NSN 6220-01-299-2298
NSN 5925-01-492-4188
NSN 5895-00-900-5449
NSN 5855-00-167-7893
NSN 5835-01-406-4066
NSN 5998-00-141-2489
NSN 5920-01-513-2761
NSN 5935-01-036-1926
NSN 5975-01-368-8120
NSN 5990-01-206-3606