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 5835-01-545-5689
NSN 7035-01-647-9698
NSN 5985-01-337-9981
NSN 5910-01-633-9963
NSN 6145-00-011-2390
NSN 5915-00-734-4399
NSN 6620-00-379-2856
NSN 6130-01-417-2885
NSN 6110-01-181-9925
NSN 5895-00-900-8511
NSN 4140-00-230-4252
NSN 5975-01-366-5465