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 5895-01-145-3263
NSN 6130-01-185-7756
NSN 6145-01-531-0193
NSN 5905-00-728-8183
NSN 6150-00-049-8740
NSN 5915-01-115-1996
NSN 7035-01-145-5059
NSN 5925-00-892-1115
NSN 5965-01-537-7731
NSN 6130-01-576-4318
NSN 5960-01-368-5874
NSN 6220-01-465-5401