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 5945-01-317-3193
NSN 6320-01-087-7962
NSN 6220-01-024-1106
NSN 5985-01-296-7308
NSN 5925-01-434-8856
NSN 5950-01-384-6352
NSN 5930-00-159-5831
NSN 5998-01-278-2573
NSN 6620-01-094-1246
NSN 6240-01-037-2215
NSN 5905-01-335-7051
NSN 6145-01-589-4198