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 6620-01-066-7950
NSN 6135-01-570-4284
NSN 6145-01-445-4707
NSN 5935-01-367-2771
NSN 5998-01-027-1222
NSN 5935-01-624-0514
NSN 6620-01-513-2800
NSN 5905-01-527-9262
NSN 6135-01-195-5343
NSN 6240-00-311-6180
NSN 6130-00-714-6275
NSN 6610-01-156-0810