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 5945-01-359-8834
NSN 6320-01-285-1922
NSN 7035-01-462-7731
NSN 5835-01-560-8525
NSN 5975-00-276-7559
NSN 6145-00-964-5194
NSN 5999-00-628-1619
NSN 6685-00-348-6693
NSN 5990-01-411-5930
NSN 6685-01-398-7371
NSN 5895-00-075-2634
NSN 5960-01-005-1192