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 6220-00-230-0807
NSN 5910-01-642-9741
NSN 6650-01-200-7099
NSN 2925-01-175-1217
NSN 6240-01-088-7629
NSN 6320-01-560-7177
NSN 5855-00-797-8217
NSN 5985-00-104-3044
NSN 5835-01-166-7420
NSN 5910-00-071-9290
NSN 5895-01-350-1892
NSN 6645-00-356-0864