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 5999-00-080-1831
NSN 5925-00-529-3950
NSN 6620-00-959-6614
NSN 5998-01-352-5854
NSN 5895-01-076-5570
NSN 6110-00-284-1161
NSN 5996-01-185-7632
NSN 5925-01-012-1890
NSN 6610-00-236-7175
NSN 6620-01-346-6575
NSN 5999-01-465-9255
NSN 2925-01-633-4048