Bolts:10.9/12.9 Class, minimum tensile strength 170,000 psi. Nuts:M12-M33 ,10 Class, Hardness: HRC26-36, Products:Our ... to clients’ drawings or samples.Machanism Capability: Bolts:10.9/12.9 Class, minimum tensile strength 170,000 psi.Nuts: ... M12-M33 ,10 Class, Hardness: HRC26-36, fully hardened and ... . Manufacturer wheel bolts/ forging Auto Fasteners/10.9/12.9