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 6105-01-399-8556
NSN 5996-01-551-8834
NSN 5975-01-004-2009
NSN 5975-01-627-4677
NSN 6620-00-470-3219
NSN 6610-00-097-0180
NSN 6150-01-473-9499
NSN 5950-00-731-1410
NSN 6145-00-449-6985
NSN 6645-00-222-2785
NSN 6130-01-634-0603
NSN 6110-01-160-0214