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 6220-00-799-4230
NSN 5996-01-151-1607
NSN 5975-00-407-6554
NSN 5935-01-617-7864
NSN 4140-01-193-0625
NSN 5925-01-386-7084
NSN 5855-00-483-0020
NSN 5996-00-358-5450
NSN 5895-00-373-2743
NSN 5855-00-885-8452
NSN 5999-01-231-9633
NSN 6105-00-179-9863