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 6110-01-004-2398
NSN 5950-01-520-8591
NSN 6685-01-351-4586
NSN 6135-01-538-5248
NSN 5855-01-027-1571
NSN 5990-00-866-3694
NSN 6145-01-504-2583
NSN 5985-01-441-8229
NSN 5945-00-339-2755
NSN 6320-01-501-7935
NSN 5925-00-220-6841
NSN 5998-01-024-3684