2a 1st end thread class 7 2nd end bolt hole quantity 16 1st end thread quantity per inch one hole offset, flange hexed between 5 bolt holes un 1st end thread series
2a 1st end thread class 7 2nd end bolt hole quantity 16 1st end thread quantity per inch one hole offset flange hexed between 5 holes anodize surface treated un 1st end thread series