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 6145-01-541-6989
NSN 5945-01-454-3523
NSN 5965-00-239-3471
NSN 5985-01-248-8522
NSN 6645-00-494-0839
NSN 4140-01-113-4668
NSN 6650-01-160-1110
NSN 5915-01-644-4257
NSN 5965-01-191-0735
NSN 5895-01-122-8287
NSN 6130-01-432-6518
NSN 5999-01-630-5274