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 5855-01-050-0861
NSN 5905-01-168-7806
NSN 6650-00-066-4999
NSN 7035-01-485-9723
NSN 5895-00-980-2432
NSN 6150-01-276-9301
NSN 5910-01-417-8916
NSN 6320-01-345-5818
NSN 5996-01-651-4195
NSN 5855-00-151-3853
NSN 6135-01-174-2467
NSN 5920-00-633-0123