Used on buf engine,aircraft,f100-pw-200 (f-16a/b/c/d). 2a 1st end thread class grumman aerospace corp supports A10 aircraft passivate surface treated nptf 2nd end thread series
2a all ends thread class 12 all ends thread quantity per inch zinc nipple or cadmium nipple surface treated flared w/ bulkhead thread un all ends thread series