TorqueSpec
Bolt torque database
Metric
Imperial
Calculator
About
Metric Bolts
Imperial Bolts
Calculator
About
Bolt Torque Calculator
Select bolt type, size, grade, and surface condition to calculate the recommended tightening torque.
Standard
Metric (ISO)
Imperial (SAE)
Surface Condition
Plain / Dry (K=0.20)
Oiled (K=0.15)
Zinc Plated (K=0.18)
Waxed (K=0.10)
MoS₂ (K=0.12)
Galvanized (K=0.25)
Bolt Size
M3
M4
M5
M6
M7
M8
M10
M12
M14
M16
M18
M20
M22
M24
M27
M30
M33
M36
M39
M42
M45
M48
M52
M56
M64
Property Class
4.6
4.8
5.6
5.8
6.8
8.8
9.8
10.9
12.9
Coarse thread
Fine thread
Calculate Torque
—
N·m
—
ft·lbs
—
in·lbs
—
kgf·cm
Calculation Breakdown
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