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: Apparatus & equipment, automatically developing photographic film/paper in rolls, automatically exposing developing film to roll of photographic paper
NSN 6220-00-205-2040
NSN 5999-01-501-0694
NSN 2925-00-625-7566
NSN 5895-01-541-4812
NSN 6105-00-724-9472
NSN 6685-00-728-4744
NSN 6145-01-213-6635
NSN 5965-01-414-4345
NSN 5985-01-498-2754
NSN 5855-01-365-4287
NSN 5910-01-113-8263
NSN 5945-01-143-1662