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The torque depends on a few things lubrication, grade(strength), the nut inside diameter, and thread pitch. The grade can be found on the nut generally ranging from 4.8-12.9.

Assuming the inside diameter of the nut is close to 12mm, below shows the torque value corresponding to its grade non lubricated.

Metric; US customary units

4.8 = 50Nm; 37Ft lbs

8.8 or 9.8 = 95Nm; 70Lbs

12.9 = 165Nm; 120Ft lbs

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