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 5945-00-741-3711
NSN 6685-01-525-5260
NSN 6650-01-067-8946
NSN 6150-00-013-5613
NSN 6240-01-346-8215
NSN 6610-01-519-3080
NSN 5985-00-679-3310
NSN 5975-01-574-2802
NSN 5960-00-179-4749
NSN 6320-00-242-0626
NSN 5965-00-791-0964
NSN 6220-00-775-7498