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 6685-01-627-1836
NSN 6620-00-819-5046
NSN 5855-01-254-1571
NSN 5965-01-504-0077
NSN 6150-01-658-1569
NSN 5905-01-422-1354
NSN 6610-00-027-1284
NSN 5996-01-516-7208
NSN 5945-01-209-9891
NSN 6610-00-571-1811
NSN 6645-01-374-4354
NSN 5960-01-044-3798