Helix 27-Inch Early Ford Front Axle Hairpin Radius Rod-EachHelix Early Ford 27 hairpin radius rod is constructed from heavy duty forged steel with a 4. 5 spread center to center eye spacing and 5 8 18 RH thread on both ends. Designed for use with 5 center to center hairpin batwing or axle brackets on input end and male rod adjuster, spherical rod end, or Ford type tie rod end on rear (output) end. Construction is rugged 7 8 O. D. heat treated carbon steel tubing, unfinished. Application: Early Ford 1928 1934