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 7035-00-455-7666
NSN 6685-00-928-0442
NSN 4140-00-517-7902
NSN 6240-00-660-8849
NSN 5905-01-424-2957
NSN 5835-01-221-6751
NSN 6240-01-217-0432
NSN 6240-01-521-2921
NSN 5998-00-552-6703
NSN 5945-00-540-8178
NSN 5910-01-065-9963
NSN 5998-00-679-4001