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 6650-01-577-1304
NSN 5910-00-771-3451
NSN 6645-01-390-6520
NSN 5910-00-826-9192
NSN 5920-01-255-6903
NSN 7035-01-501-9118
NSN 5999-01-470-0233
NSN 5996-01-557-3058
NSN 5996-01-025-5683
NSN 6645-01-502-3068
NSN 6145-00-286-9588
NSN 5985-01-227-7533