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 6110-01-139-4646
NSN 5855-01-656-6808
NSN 6610-01-330-7839
NSN 6610-00-681-0590
NSN 5895-01-578-4925
NSN 5990-00-263-1289
NSN 5930-00-781-7149
NSN 2925-01-620-9673
NSN 5996-00-518-4880
NSN 2925-01-418-3296
NSN 5950-01-207-0929
NSN 6240-01-165-2693