Used on ayf engine, aircraft tf33-p-3/5/9 (c/ec-135, b-52h). 3a 1st end thread class 3 2nd end bolt hole quantity 12 1st end thread quantity per inch o-ring groove in face of flange uns 1st end thread series
Used on 04f aircraft, stratofortress b-52. 3a 1st end thread class 12 1st end thread quantity per inch cadmium inside surface treated un 1st end thread series