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 6145-01-524-0416
NSN 5930-01-260-9999
NSN 5985-01-079-3880
NSN 5996-01-021-5814
NSN 5835-01-307-8954
NSN 6110-01-499-4117
NSN 6145-01-068-4138
NSN 5855-00-198-3197
NSN 5905-00-840-5281
NSN 5998-00-526-9253
NSN 6130-00-826-7241
NSN 6240-01-570-0478