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 6620-01-502-9104
NSN 6610-01-017-9063
NSN 6650-01-416-6272
NSN 6685-00-302-6186
NSN 5895-01-531-4037
NSN 5975-00-655-1819
NSN 2925-01-633-4048
NSN 6145-00-046-4568
NSN 5945-00-910-6957
NSN 6620-01-082-2483
NSN 6130-01-013-9343
NSN 5996-01-606-9454