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 2925-00-156-8963
NSN 6685-01-441-8361
NSN 6145-01-372-5438
NSN 5835-01-332-2867
NSN 6650-00-004-3683
NSN 6320-01-081-7748
NSN 6110-01-147-9175
NSN 6685-00-823-7790
NSN 5998-01-036-7236
NSN 5930-01-139-9726
NSN 5915-00-118-5957
NSN 5975-01-614-2046