Used on end item nsn 2350-01-061-2445. 0.156" hole diameter washer has keyway 0.08 in wide, 0.020 in deep from inside hole to outside edge passivate surface treated
2b thread class 20 thread quantity per inch items are being coded as critical to insure source inspection will be performed at the point of manufacture, prior to material receipt by the us navy or other dod components. these items are piece parts or end items in support of vital military hardware necessary to sustain the successful mission of the ships, submarines,
