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 6320-01-515-5346
NSN 5920-01-308-4761
NSN 5996-01-342-4155
NSN 5985-00-578-7740
NSN 5975-00-942-1001
NSN 6150-01-211-7032
NSN 6240-01-355-4425
NSN 5960-00-485-0601
NSN 5945-00-362-3265
NSN 6620-00-388-0047
NSN 5985-00-919-2936
NSN 5950-00-081-3956