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 5935-01-541-3209
NSN 5905-00-232-3770
NSN 5998-00-849-6648
NSN 5920-00-179-4580
NSN 5965-01-304-3638
NSN 6320-01-192-0332
NSN 6145-01-447-8168
NSN 6105-00-419-3174
NSN 5950-01-197-5285
NSN 5950-01-413-7634
NSN 5960-01-539-1956
NSN 5905-01-574-6753