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 5895-00-035-8813
NSN 5996-00-766-0814
NSN 6110-00-444-6939
NSN 6610-00-134-1458
NSN 6685-01-602-9962
NSN 5910-01-499-0532
NSN 5999-00-364-0769
NSN 6130-01-374-8291
NSN 5910-01-311-1234
NSN 5999-01-467-3031
NSN 6150-01-267-9340
NSN 6130-00-126-9868