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.
Columbia 
Canada 
Germany Classification: Gaskets,washers & other seals
NSN 6610-00-720-8775
NSN 6685-01-578-7011
NSN 5998-01-447-3668
NSN 5965-00-043-3463
NSN 5895-00-651-1265
NSN 5895-01-509-9151
NSN 6130-01-168-9417
NSN 6240-00-186-6611
NSN 6110-01-386-4055
NSN 5920-00-057-3876
NSN 5996-01-341-4313
NSN 5985-01-552-2758