Machined from U.S. milled fine grain, heat treated aircraft quality steel.180,000PSI yield strength. Threads rolled after heat treat for maximum strength and fatigue life Centerless ground OD to insure concentricity. Case end threaded for interference fit to insure good thread contact even as aluminum case expands at high temps. Black Oxide finish to resist corrosion and give an excellent appearance.
NoteBig Twin Evo 84-99