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Grade 10.9 bolts or capscrews have a minimum tensile strength of 1040N/mm2 and a hardness of 320 - 380Hv10.
Grade 12.9 bolts or capscrews have a minimum tensile strength of 1220N/mm2 and a hardness of 385 - 435Hv10.
The 12.9 fastener is therefore a higher grade (hardness and tensile strength) fastener compared with 10.9 grade
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