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 5935-01-607-0064
NSN 5905-00-193-7335
NSN 5935-01-379-6855
NSN 5895-01-548-8941
NSN 5975-01-485-2385
NSN 6620-00-330-3728
NSN 5910-00-041-1919
NSN 5895-01-535-6456
NSN 5945-01-297-7349
NSN 5960-01-229-6324
NSN 5925-00-350-4478
NSN 6240-01-332-3624