- 307
- 153
- 43
- Location
- Sweeden, KY
If the bolts that broke were M10.9, then your torque wrench may be somewhat out of calibration. For 57 ft-lbs to have yielded and broken these bolts, the nut factor would have to be down around 0.10, which corresponds to something like a moly lube. If the bolts are plated with certain coatings that can drive the nut factor down.
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