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 6610-01-058-2366
NSN 6685-00-886-6876
NSN 6650-01-017-0980
NSN 5915-01-420-5777
NSN 5835-01-281-7281
NSN 6320-01-166-3602
NSN 5930-00-839-3928
NSN 5999-00-061-3168
NSN 6620-01-008-8037
NSN 6645-01-297-2081
NSN 6320-01-466-4175
NSN 5990-01-563-1554