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 6645-00-163-4624
NSN 6620-01-101-4408
NSN 5835-01-534-3172
NSN 6610-01-174-9075
NSN 4140-00-038-7577
NSN 5895-01-617-4260
NSN 5998-01-094-7368
NSN 6130-01-141-7419
NSN 6130-01-348-7376
NSN 6130-01-109-7878
NSN 5999-00-727-8787
NSN 6610-01-352-5500