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.
Thailand 
Canada 
Republic of Korea 
Turkey Classification: Gaskets,washers & other seals
NSN 6130-01-263-7321
NSN 5835-01-055-6063
NSN 5925-01-025-0322
NSN 5950-01-566-0461
NSN 6145-01-527-0081
NSN 6110-01-011-8083
NSN 5999-01-227-1976
NSN 5965-01-125-5367
NSN 2925-01-347-4208
NSN 5835-01-416-6455
NSN 6135-01-156-4627
NSN 5895-00-731-4935