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 5935-00-826-8817
NSN 6240-00-691-0369
NSN 4140-01-223-6079
NSN 6620-01-485-0556
NSN 6150-01-023-7710
NSN 7035-00-205-8739
NSN 5999-00-212-7853
NSN 6610-01-514-7755
NSN 6240-01-596-0723
NSN 5895-01-014-6511
NSN 6105-01-555-8995
NSN 6645-00-776-8234