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a 12.9 bolt is one of the highest grade of bolts produced. known for their high tensile strength, they are built with both hex and torx heads and are available in zinc or chrome finishes. a 12.9 bolt is tightened with a torque wrench to 90 percent of its proof load.
12.9 class 12.9 alloy steel, quenched and tempered 1.6mm 100mm 141,000 / 970 160,000 / 1100 177,000 / 1220 tensile strength the maximum load in tension (pulling apart) which a material can withstand before breaking or fracturing.
