The "I"-beam part of a completed connecting rod is .282 wide X .156 thick. The radius at the junction of the I-beam & the upper or lower holes is .8125 (1.625 dia. end mill). This end mill profiles the entire outside of the rod. A .1875 ball nosed mill forms the center section of the I-beam which is .031 thick in the center. The wrist pin hole is .250 ID X .360 OD. The crank pin hole is .4538 ID X .625 OD. The undercut on the outside of the big end is .031 deep X .156 wide & it also has a radius on the inside corner. The center distance of the two holes is 1.741. After hardening (1760 deg f; quench in oil) the S-7 rods are double tempered at 400 deg f., giving a tensile strength of 315,000 lbs/square in, a yield strength of 210,000 lbs/square in, at 58 Rc & a 1 in Charpy V test of over 224 ft lb.
