A circular shaped item with an aperture manufactured to predetermined dimensions and designed for use as a seal in stuffing boxes, packing nuts, and the like. It may be (1) any nonmetallic molded or formed ring (except solid (without joint) rings having a square or rectangular cross section); or (2) any shredded metal or metal foil type metallic or semimetallic rings. Excludes felt items but includes multimaterial items in which one of the materials is felt. For solid (without joints) nonmetallic items with a square or rectangular cross section, see washer (as modified) and gasket. For rubber items specifically designed for weather-proofing doors, windows, chests, and the like see seal, nonmetallic angle; seal, nonmetallic channel; and seal, nonmetallic, special shaped section. For circular (with aperature) nonmetallic items with a solid round cross-section see o-ring. Excludes cup, compression; gasket; washer (as modified); and felt, mechanical, preformed.
Dept. of the Army 
Dept. of the Navy 
Republic of Korea Classification: Gaskets,washers & other seals
NSN 6145-01-609-8830
NSN 5920-00-541-1119
NSN 6240-01-408-1212
NSN 6145-01-256-0536
NSN 5990-01-432-4984
NSN 6130-01-485-0812
NSN 6105-01-234-5401
NSN 5945-01-071-0293
NSN 5925-01-068-5262
NSN 6320-01-523-4954
NSN 2925-01-204-6243
NSN 6135-00-451-0709