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 5920-00-918-4426
NSN 5945-01-039-8704
NSN 5960-00-817-5088
NSN 5905-00-246-8714
NSN 6645-01-010-3746
NSN 7035-01-478-5922
NSN 6645-01-101-1062
NSN 5965-00-932-4591
NSN 6130-00-853-7177
NSN 6320-01-496-4605
NSN 6610-01-417-4389
NSN 7035-00-104-7613