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 4140-00-128-8072
NSN 5975-01-609-8719
NSN 6150-01-534-1105
NSN 4140-00-816-8820
NSN 5985-00-355-7538
NSN 6135-01-570-4284
NSN 5975-01-359-4810
NSN 5975-00-522-7125
NSN 7035-00-059-7970
NSN 5999-01-349-8682
NSN 5910-01-590-0118
NSN 5975-00-231-1415