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 5950-01-530-2788
NSN 6320-01-237-9746
NSN 5998-00-854-0880
NSN 5945-01-100-3877
NSN 5950-01-437-3372
NSN 6685-01-279-9595
NSN 7035-01-451-6421
NSN 6105-01-517-2448
NSN 5950-01-338-5057
NSN 5975-01-483-7719
NSN 5910-01-516-3787
NSN 5855-01-228-0942