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 6645-00-025-4771
NSN 6645-01-308-5729
NSN 6130-01-420-6617
NSN 4140-01-270-6246
NSN 6650-01-462-5879
NSN 5990-01-605-4769
NSN 5960-01-512-0233
NSN 2925-00-024-6392
NSN 5965-01-218-7795
NSN 5930-00-929-7869
NSN 5960-00-153-7115
NSN 6150-01-132-4651