Called washer, seal
A washer of various shapes having a centrally located hole. It is primarily used as a seat for a bolt or screw to distribute pressure and has a sealing element. It may be used in connection with metallic washers to which it can be bonded.
NSN 4140-01-227-4674
NSN 5915-01-378-6058
NSN 6645-01-322-8431
NSN 6650-00-847-3492
NSN 5965-01-038-1904
NSN 6150-01-054-3983
NSN 6610-01-148-2181
NSN 5925-01-142-7775
NSN 6220-00-905-5686
NSN 6650-01-618-0680
NSN 5945-01-227-6922
NSN 5855-00-089-3974