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 5950-00-225-8849
NSN 5915-00-248-5824
NSN 5920-00-370-2492
NSN 5835-00-065-6757
NSN 2925-01-548-6674
NSN 5945-01-336-0140
NSN 6645-01-376-2336
NSN 5910-00-855-1841
NSN 7035-01-357-9246
NSN 5895-00-153-9445
NSN 5925-01-340-5538
NSN 7035-01-417-6261