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 5835-01-279-2580
NSN 6685-01-074-4695
NSN 5945-00-850-9873
NSN 6150-00-769-5017
NSN 5855-01-138-4985
NSN 5895-00-966-2416
NSN 6320-00-937-5625
NSN 5945-01-373-1554
NSN 6130-00-037-9625
NSN 5935-01-013-1458
NSN 5985-01-337-6124
NSN 6610-01-112-0447