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 5935-00-156-0455
NSN 5855-01-357-7907
NSN 5975-01-144-0346
NSN 4140-01-033-3624
NSN 5930-01-174-8656
NSN 6150-00-462-2741
NSN 2925-01-261-0701
NSN 6650-00-003-5413
NSN 5960-01-299-5832
NSN 5999-01-414-8228
NSN 5920-01-257-9549
NSN 5965-01-422-9770