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 5835-01-442-6482
NSN 7035-00-059-7970
NSN 6685-01-315-4079
NSN 5950-01-418-8419
NSN 5960-01-238-7367
NSN 6130-01-324-1253
NSN 6645-00-879-9941
NSN 5835-01-557-9062
NSN 6145-01-359-6449
NSN 5990-00-010-1413
NSN 6240-01-275-1013
NSN 5930-01-285-4718