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
3a 1st end thread class mtg flange in lieu of wrenching facility, 2 holes, 0.205 in. nom dia, 1.340 in. distance c to c anodize surface treated anpt 2nd end thread series