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 5945-01-398-9559
NSN 6130-01-443-9544
NSN 6145-01-117-9500
NSN 6145-00-074-8778
NSN 5998-01-025-6764
NSN 6150-01-507-7669
NSN 6110-01-391-8871
NSN 5950-01-431-9068
NSN 5985-01-567-2762
NSN 5835-00-148-9719
NSN 5930-01-447-0851
NSN 5996-00-940-3314