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.
Spain 
Turkey 
NATO Maintenance and Supply Agency Classification: Gaskets,washers & other seals
NSN 6645-01-291-4175
NSN 5835-01-012-4245
NSN 6650-01-441-3142
NSN 5920-01-414-2393
NSN 6105-01-278-6517
NSN 6650-01-522-7462
NSN 5985-01-020-7894
NSN 6220-01-113-6431
NSN 5998-00-498-9196
NSN 5996-01-092-9873
NSN 6105-01-050-2473
NSN 6240-01-394-8064