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 6105-01-020-3558
NSN 6620-01-542-8709
NSN 5920-01-425-7496
NSN 6150-01-657-2955
NSN 5975-01-633-0094
NSN 5999-01-604-9271
NSN 5950-00-107-7321
NSN 2925-00-833-9466
NSN 2925-00-923-4397
NSN 5930-00-807-7471
NSN 5965-00-360-9534
NSN 6650-00-766-0733