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 5910-01-014-5129
NSN 6240-00-451-8587
NSN 5905-01-088-7416
NSN 7035-01-098-5474
NSN 6320-01-612-7035
NSN 6650-01-551-6866
NSN 5935-01-010-3415
NSN 5985-01-140-9802
NSN 6150-00-209-7736
NSN 5996-00-456-8705
NSN 5950-01-341-3015
NSN 6685-00-990-3694