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 5925-01-628-1075
NSN 5855-01-549-3666
NSN 5950-01-381-0386
NSN 6220-00-116-8464
NSN 5945-01-475-0780
NSN 5915-00-636-4238
NSN 6610-00-127-7013
NSN 5945-01-379-4999
NSN 5895-01-056-4548
NSN 5945-00-838-6888
NSN 6110-01-062-0252
NSN 5998-01-443-3858