... Benz, Volvo, Nissan, Suzuki, etc. Machanism Capability: Bolts:10.9 Class, minimum tensile strength 170,000 psi.Nuts:10 Class ... fully hardened and tempered to match bolt strengthWe also produce 12.9 class high tensile fasteners by forging. Buyer's Inquiry: ... and trivalent zinc plating, which with RoHS compliant. At the meantime, we offer surface treatment in black oxide, phosphate , eletrophoresis ...