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 5960-01-016-9224
NSN 6105-01-331-3048
NSN 6650-01-617-2513
NSN 5910-00-702-5455
NSN 6685-00-217-9010
NSN 5895-00-923-6543
NSN 5910-00-170-9581
NSN 6145-01-185-7803
NSN 5999-00-035-9288
NSN 5905-01-575-5876
NSN 2925-01-497-1364
NSN 5960-00-522-5231