Manton Pushrods D-503-12V - Series 5 12V Cummins Diesel Pushrods Series 5 high performance: 3/8 diameter by .095 wall thickness Hard drawn 4130/4135 seamless chromoly tubing - Utilizing proprietary heat treating techniques we are able to achieve a 275,000 psi tensile strength from the tubing without causing it to become brittle. Rated for use in applications up to 1200 Horse Power Billet tips made from high impant , wear resistance 8620 bar stock is then Case hardened , heat treated and tempedered Stock length