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 5905-01-632-4734
NSN 5905-01-317-6684
NSN 5915-01-367-2056
NSN 6650-00-518-5194
NSN 5915-01-501-5895
NSN 6135-00-900-2139
NSN 6685-01-643-1952
NSN 6240-00-951-2915
NSN 5950-01-480-5688
NSN 5945-01-202-9666
NSN 5996-00-814-7376
NSN 5895-01-386-3049