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 5935-01-038-9646
NSN 6110-01-268-1723
NSN 6610-00-184-0833
NSN 5990-01-061-5618
NSN 5999-01-344-1961
NSN 5905-01-566-0315
NSN 5920-00-019-9044
NSN 5895-01-211-6241
NSN 6145-00-372-3713
NSN 5930-00-449-1720
NSN 5965-01-099-8745
NSN 6135-01-159-9705