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 
Singapore 
New Zealand Classification: Gaskets,washers & other seals
NSN 6240-00-548-3992
NSN 6650-01-003-4144
NSN 5960-00-020-9453
NSN 5925-00-284-3233
NSN 5965-01-256-9460
NSN 5975-00-428-1683
NSN 5915-00-835-9413
NSN 5930-01-428-8938
NSN 6220-01-227-5999
NSN 5999-01-020-7641
NSN 4140-01-392-4664
NSN 4140-01-367-0791