3.5000" overall length jthree 0.3440 in. dia holes through flange face, one 0.1250 in. dia hole through flange od, tap drill 0.2188 in. dia 0.3800 in. deep, 1/4-28 unf tap to full depth, 90 deg. countersink 0.2800 in. dia 0.1900 in. deep 22c solid, external flange one end