Used on kc-135 aircraft. 0.625" hole diameter 1.00" outside diameter 0.070" material thickness flange washer auxillary power unit fire ext bottle components 15 recessed
Used on 3930-01-599-9978. 0.260" hole diameter 0.690" outside diameter 0.17" material thickness nylon countersunk washer washer will not scratch smooth surfaces; washer is reliable from minus 40deg to plus 185deg recessed