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 6105-00-741-9120
NSN 5960-01-223-1203
NSN 5960-01-441-5340
NSN 5975-01-421-4474
NSN 6620-00-010-8190
NSN 5990-01-493-4039
NSN 5950-01-115-2016
NSN 5930-01-116-3346
NSN 5935-00-875-7904
NSN 6220-01-508-1003
NSN 5950-01-451-3518
NSN 7035-00-437-7950