Part No. 134-5502 - includes a set of seven main studs, three windage tray studs, ten parallel ground washers, ten hex nuts and six windage tray retaining nuts. All 8740 Pro Series studs are centerless ground, heat treated prior to thread rolling and machining, and are nominally rated at 200,000 psi. These fasteners deliver a 15-percent increase in tensile strength over the OEM main bolts.