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 5965-01-074-3083
NSN 6105-00-595-5378
NSN 6145-01-469-3809
NSN 6610-01-631-4355
NSN 5996-00-186-6186
NSN 5925-01-200-2714
NSN 6240-00-146-9322
NSN 5965-01-386-2988
NSN 6135-01-056-4609
NSN 6650-00-107-8509
NSN 5950-00-383-6702
NSN 6610-01-342-9774