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 Navy 
Brazil 
Spain 
Canada 
Republic of Korea 
Italy 
Greece 
Turkey Classification: Gaskets,washers & other seals
NSN 6610-01-338-6272
NSN 5920-01-271-4750
NSN 6220-01-449-1877
NSN 5855-01-593-7384
NSN 4140-00-707-5963
NSN 5975-01-394-5669
NSN 6145-01-337-0008
NSN 5999-00-721-3942
NSN 6105-01-230-7024
NSN 6150-01-498-1141
NSN 2925-01-459-8093
NSN 6620-01-631-7770