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 Air Force 
Dept. of the Navy 
Poland 
Spain 
Italy Classification: Gaskets,washers & other seals
NSN 5925-01-649-0594
NSN 5960-00-740-7285
NSN 5910-01-031-3213
NSN 5985-01-654-0448
NSN 6105-01-588-4973
NSN 6105-01-603-0373
NSN 5945-01-034-2196
NSN 5925-01-411-5222
NSN 5930-01-285-1211
NSN 5915-01-495-1923
NSN 6650-01-589-0893
NSN 4140-00-567-7773