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 6145-01-589-0063
NSN 5950-01-241-5941
NSN 5965-00-407-0308
NSN 5998-00-839-8506
NSN 6645-00-456-0080
NSN 6145-01-394-3122
NSN 6650-01-079-8675
NSN 4140-00-051-2620
NSN 5975-01-158-6150
NSN 5975-01-382-7955
NSN 5895-01-302-9244
NSN 5998-01-634-0604