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 5835-01-373-9506
NSN 6220-01-145-4993
NSN 5855-00-951-6483
NSN 5985-00-846-6442
NSN 5965-01-150-6315
NSN 5920-00-901-7436
NSN 5930-00-446-3263
NSN 7035-01-627-0905
NSN 6130-00-483-8641
NSN 5975-00-150-6400
NSN 5930-01-599-9090
NSN 5975-01-456-7638