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 6105-01-239-1421
NSN 6685-00-991-0738
NSN 2925-00-307-4553
NSN 5999-01-434-5670
NSN 5950-00-542-0627
NSN 5915-00-563-7058
NSN 5965-01-262-3513
NSN 5965-01-472-3664
NSN 5910-00-186-0917
NSN 5990-01-390-2177
NSN 5998-01-395-9746
NSN 6110-00-271-9928