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.
National Aeronautics and Space Administration 
Spain 
Kuwait 
Canada 
France 
Germany Classification: Gaskets,washers & other seals
NSN 6110-01-418-3357
NSN 5835-01-439-0180
NSN 5915-01-023-5460
NSN 5925-01-540-3872
NSN 6135-01-407-0594
NSN 5905-01-123-8993
NSN 5895-01-409-1158
NSN 5975-01-109-9604
NSN 5915-00-243-2030
NSN 6610-00-929-4000
NSN 6220-00-538-3137
NSN 5950-00-115-3652