3a 2nd end thread class 12 1st end thread quantity per inch three 0.065 in.min, 0.075 in.max dia holes drilled through hex corners, 0.203 in.from first end cadmium inside surface treated un 2nd end thread series
Used on aircraft, c-5(galaxy). 3a all ends thread class 12 all ends thread quantity per inch weapon system essential anodize surface treated unj all ends thread series