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 5999-01-351-6979
NSN 6130-01-425-2174
NSN 5920-01-342-3681
NSN 5990-00-759-9305
NSN 6150-01-278-4644
NSN 5925-01-222-0835
NSN 6645-01-439-4240
NSN 5835-01-492-4318
NSN 5935-01-249-1021
NSN 5996-01-123-4349
NSN 5945-01-271-2144
NSN 5965-01-042-2001