BNEW Head Stud Kit FORD 6.0L Powerstroke Diesel 2003-2007 F250 F350 F450 F550 SD ReviewbP PP NEW Head Stud Kit FORD 6.0L Powerstroke Diesel 2003-2007 F250 F350 F450 F550 SD PMaterial: alloy steel (widely used in short track and drag racing as an upgrade of regular chrome molybdenum)PTensile Strength (A clamp load): 220,000 psiPYield strength (stress at which deformation of a material occurs): 180,000 psiPTorque with lube: 205 ft. lb.