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APR 8740 Head Stud Kit 12-point Nuts fits Honda 1.6L D16 Series Engines ARP uses a premium grade 8740 alloy that is rated far superior to aircraft quality. Each stud is precisely heat-treated to 200000 psi. Following heat-treat each stud is centerless ground to make it as close to perfectly concentric as possible. This procedure involves about ten very slight cuts and results in an exceptionally straight part. Its important to note that lesser quality studs are not even centerless ground – the material is thread rolled in bar stock form mostly before heat-treat when the material is easier to machine. Because ARP studs are manufactured to such exacting tolerances you will note that gaskets and cylinder heads literally glide into position and are perfectly aligned – something that wont happen with inferior quality head studs. ARP studs are thread rolled after heat-treat which gives them about 1000% thats ten times better fatigue strength than those studs that are threaded prior to heat-treat.