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.
Dept. of the Air Force 
Dept. of the Navy 
Poland 
Spain 
Italy Classification: Gaskets,washers & other seals
NSN 5999-00-413-0223
NSN 6145-01-423-6628
NSN 6240-01-492-8133
NSN 5910-01-304-7145
NSN 7035-01-396-3343
NSN 5920-01-155-7685
NSN 5910-00-906-2498
NSN 5855-00-444-2298
NSN 5996-01-579-4849
NSN 5945-00-379-6745
NSN 6240-01-423-9738
NSN 5855-00-361-0167