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.
Brazil 
Spain 
France 
Republic of Korea Classification: Gaskets,washers & other seals
NSN 6685-00-960-7667
NSN 6650-01-345-2866
NSN 5855-01-035-2866
NSN 5999-00-456-0603
NSN 4140-01-632-1428
NSN 5945-01-500-5370
NSN 6610-01-441-8364
NSN 6240-00-372-4841
NSN 2925-01-572-0539
NSN 6645-01-005-4862
NSN 6110-01-053-0041
NSN 5905-01-445-5923