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 5999-01-049-6719
NSN 5965-00-170-5254
NSN 5950-01-359-3027
NSN 5915-01-303-1924
NSN 6220-01-645-1759
NSN 5925-00-356-8007
NSN 5960-01-044-3798
NSN 5855-01-445-7980
NSN 5920-00-220-3548
NSN 6645-00-099-6913
NSN 6650-00-925-3779
NSN 5960-01-163-3847