0.3913 in. min 0.3917 in. max od,0.625 in. flange od flatted on one side 0.285 in. from center,0.251 in. min 0.253 in. max id,tap 0.086-56 unc 2b two threaded holes located on 0.250 in. radius bolt hole circle,0.0937 in. min 0.0942 in. max dia hole counterbored to 0.218 in. dia located in flange general characteristics item description