3 2nd end bolt hole quantity 12 1st end thread quantity per inch cage 52661 is the authorized distributor for cage 77445 who is the actual oem which is pratt uns 1st end thread series
2 2nd end bolt hole quantity first end has a threaded hole through one wall 1/4-20-unc 2b, rh, locsated 5/16 in. from outer edge to center of hole paint surface treated npt inlet thread series