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Tightening torque
• Values are directly specified for out-of-standard tightening torques for bolts and nuts.
• Where there is no specified figure for tightening torque, follow the table covering standard tightening torques.
(Values for standard tightening torques are based on thread size and material.)
• When the item is to be tightened in a wet state, “wet” is indicated. Where there is no indication, read it as dry.
Units
• Tightening torques and other parameters are given in SI* units with metric units added in brackets { }.
*SI: Le Système International d’Unités
Unit SI unit {metric unit} Conversion factor
Force N {kgf} 9.80665 N {1 kgf}
Moment of force N·m {kgf·m} 9.80665 N·m {1 kgf·m}
Pressure
Positive pressure kPa {kgf/cm
2
} 98.0665 kPa {1 kgf/cm
2
}
Vacuum pressure
kPa {mmHg} 0.133322 kPa {1 mmHg}
Pa {mmH
2
O} 9.80665 Pa {1 mmH
2
O}
Volume dm
3
{L} 1 dm
3
{1 L}
Heat quantity J {kcal} 4186.05 J {1 kcal}
Heat flow W {kcal/h} 1.16279 W {1 kcal/h}
Power kW {PS} 0.7355 kW {1 PS}
Example: 390 N·m {40 kgf·m}
Metric unit
SI unit