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 5930-01-523-2462
NSN 5935-01-290-5231
NSN 5965-00-201-7479
NSN 5985-01-435-4392
NSN 5925-00-107-4234
NSN 6240-01-423-6771
NSN 5998-00-006-6860
NSN 5905-00-442-6439
NSN 5999-01-574-9921
NSN 6135-00-850-3177
NSN 5915-00-232-3387
NSN 5998-01-429-0382