Calculate proper lug nut torque based on stud size, thread pitch, and friction coefficient for safe wheel mounting.
Input Parameters
Results
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Torque
N-m
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Torque
ft-lbs
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Thread Stress
MPa
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Bolt Preload
lbs
Note: Always use a calibrated torque wrench. Typical passenger car lug nut torque: 80-100 ft-lbs. Lubrication dramatically changes required torque. Never use impact guns without a torque stick.
Reference
T = K × d × F (torque-tension relationship)
K = (0.5p/(π×d_pitch) + μ/cos(α)) × (d_pitch/d) + 0.625μ
Stress Area At = π/4 × (d − 0.9382p)²
Thread Stress = Clamp Force / At
Typical K ≈ 0.2 for lightly oiled studs