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 5950-01-451-7103
NSN 6645-01-449-0785
NSN 6110-01-032-1294
NSN 5855-00-245-8461
NSN 6240-01-205-0005
NSN 5950-00-001-5860
NSN 6110-01-450-1206
NSN 5835-00-672-0761
NSN 5925-00-414-1433
NSN 5915-00-190-6940
NSN 6645-01-463-2198
NSN 5960-01-052-5039