These axles are made of high strength 4140 chromoly forged shafts and are induction hardened to RC 56-60. This pair of axles measure 30" long (measuring from wheel side of the flange to the tip of the axle). They have 8" of spline to allow the axle to be cut to your desired length (Axle can be shortened by approx. 7"). Axle features both 5 x 4-1/2" and 5 x 4-3/4" bolt patterns. Bearing flange diameter measures 1.380" and hub bore size measures 2.830". Uses RW507ER bearing for small Ford housing ends and 307FF bearing with large Ford housing ends. We also offer 34" long axles and options of 31 and 35 spline.