These are the 17-22A studs that have 215,000 psi minimum tensile strength. Glass bead finish.
Depending on the trucks set-up, upgrading to a set of these A1 Technologies head studs is always recommended at anything above a stock application. These are the best head studs available on the market today for the 2008, 2009, 2010 Ford Powerstroke 6.4L. They are produced from the highest quality 1722 material, making these the ultimate headstuds available. The 1722 studs are stronger than the 8740 alloy used by other manufacturers. A1 Technologies is the industry leader in fasteners offering studs for NHRA and Nascar.