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 6240-01-206-7519
NSN 5905-01-427-3804
NSN 5990-01-594-7470
NSN 6145-01-502-9751
NSN 5999-00-935-3361
NSN 5905-01-542-2936
NSN 5895-01-537-1255
NSN 5990-01-151-8756
NSN 5910-01-630-0832
NSN 6685-01-123-3248
NSN 6650-00-527-8822
NSN 6685-01-542-8635