A cylindrical item having an internally flanged diameter designed to retain a lens or window in the objective end, or a diopter scale at the viewing end of an optical instrument. It may have one or more of the following characteristics: internal thread or machined for a press fit, method of securing, and/or knurled periphery. For externally threaded items, see retainer, optical element. Excludes cell, optical element; nut, plain knurled; nut, plain round; and ring, retaining.
Classification: Military equipments not identified by kind
NSN 6240-00-071-1280
NSN 5905-01-110-7472
NSN 6150-01-421-2543
NSN 5930-00-243-8866
NSN 5920-01-327-2386
NSN 5835-00-647-2104
NSN 6145-01-089-7984
NSN 6240-00-635-9953
NSN 6610-01-633-8931
NSN 2925-00-167-6763
NSN 5925-01-243-4381
NSN 5950-00-735-2582