Tightening torques for bolted connections
79
Tightening torques for bolted connections as per factory norm M 3059
Bolts / nuts with external hex−head or hexsocket head, or head without collar or flange
Thread size
x pitch
Strength classifications / tightening torque in Nm
at 8.8 / 8 at 10.9 / 10 at 12.9 / 12
M4 2.5 4.0 4.5
M5 5.0 7.5 9.0
M6 9.0 13.0 15.0
M7 14.0 20.0 25.0
M8 22.0 30.0 35.0
M8x1 23.0 35.0 40.0
M10 45.0 65.0 75.0
M10x1.25 45.0 65.0 75.0
M10x1 50.0 70.0 85.0
M12 75.0 105.0 125.0
M12x1.5 75.0 110.0 130.0
M12x1.25 80.0 115.0 135.0
M14 115.0 170.0 200.0
M14x1.5 125.0 185.0 215.0
M16 180.0 260.0 310.0
M16x1.5 190.0 280.0 330.0
M18 260.0 370.0 430.0
M18x2 270.0 290.0 450.0
M18x1.5 290.0 410.0 480.0
M20 360.0 520.0 600.0
M20x2 380.0 540.0 630.0
M20x1.5 400.0 570.0 670.0
M22 490.0 700.0 820.0
M22x2 510.0 730.0 860.0
M22x1.5 540.0 770.0 900.0
M24 620.0 890.0 1040.0
M24x2 680.0 960.0 1130.0
M24x1.5 740.0 1030.0 1220.0
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