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 5935-01-394-9437
NSN 6110-01-283-1085
NSN 5950-01-600-2925
NSN 6240-00-879-0771
NSN 5910-00-200-1413
NSN 5895-01-324-1111
NSN 5925-01-260-1367
NSN 6685-01-384-3062
NSN 6130-01-561-4830
NSN 5975-00-393-2097
NSN 5935-01-233-4763
NSN 5998-01-392-1072