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 5975-00-661-1832
NSN 4140-00-983-4083
NSN 6645-01-310-7348
NSN 5935-01-335-2964
NSN 5915-00-192-3109
NSN 6320-01-504-3948
NSN 6105-00-780-2318
NSN 6650-00-400-8371
NSN 6105-00-925-2226
NSN 6320-01-125-3361
NSN 6135-00-268-8492
NSN 2925-00-940-9749