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 2925-01-218-5556
NSN 6240-00-925-4662
NSN 5920-01-645-2747
NSN 5996-01-367-6557
NSN 6650-01-108-2948
NSN 6145-01-112-1192
NSN 5990-00-164-1198
NSN 5996-01-546-9692
NSN 6105-00-914-3775
NSN 6610-00-807-6620
NSN 5930-01-126-5947
NSN 5999-00-715-0872