Demolition Grapple

Tightening Torques

The following tables contain the recommended tightening torques for screw connections.

Table 2. Screws with standard metric thread (strength class 10.9, mean friction coefficient 0.14)

Thread

Tightening torque

without lock washer

with Nord-Lock wedge lock washer

M8 x 1.25

36 Nm

34 Nm

M10 x 1.50

72 Nm

67 Nm

M12 x 1.75

125 Nm

115 Nm

M14 x 2.00

200 Nm

183 Nm

M16 x 2.00

310 Nm

279 Nm

M18 x 2.50

430 Nm

391 Nm

M20 x 2.50

610 Nm

547 Nm

M22 x 2.50

830 Nm

745 Nm

M24 x 3.00

1050 Nm

942 Nm

M27 x 3.00

1550 Nm

1375 Nm

M30 x 3.50

2100 Nm

1875 Nm

M33 x 3.50

2800 Nm

2526 Nm

M36 x 4.00

3700 Nm

3259 Nm



Table 3. Screws with inch thread (blade screws)

Plow bolt

Tightening torque

5/8"

270 Nm

3/4"

475 Nm

7/8"

750 Nm

1"

1150 Nm

1 1/4"

2300 Nm



Table 4. Hose fittings with O-ring seal and union nut

Thread

Pipe outer diameter

Tightening torque

M20 x 1.50 (S12)

12 mm (0.47")

58 Nm

M24 x 1.50 (S16)

16 mm (0.63")

42 Nm