5BT 45
3.3 Tightening Torques
DG and P (Plastoform) screws are used in polymer and lightmetal components. These screws form a
permanent thread when they are installed for the first time. They can be removed and installed as often as
necessary without impairing the strength of the screwed assembly, providing the specified tightening torque is
observed.
For this reason it is essential to use a torque wrench.
Fastener Thread size For component Torque Remarks
lbf.ft Nm
M14x7 Stub/muffler 7.5 10.0
Screw IS-DG5x24 Spacer flange/cylinder 4.4 6.0
Screw IS-DG5x20Z Fan housing/spiral housing 4.4 6.0
Screw IS-DG5x24 Spiral housing/crankcase 4.4 6.0
Screw IS-DG5x24 Spiral housing/engine pan 4.4 6.0
Screw IS-DG5x20Z Fan housing/spiral housing 4.4 6.0
Screw M4x8 Guide plate/gear housing 3.0 4.0
Screw IS-DG5x60 Muffler/cylinder 6.6 9.0
Screw M6x25LH Lock screw, chuck/output shaft 7.5 10.0
1/2“-20 Chuck/output shaft 26 35.0 1)
Screw IS-P4x14 Rotary knob/driver, gearbox 0.75 1.0
Fastening nut M5 Filter cover/handle housing/screw 1.5 2.0
Screw IS-DG5x20 Gear housing, right/left 5.9 8.0
Screw IS-DG5x24 Gear housing/crankcase 5.9 8.0
Screw IS-DG5x24 Gear housing/engine pan 5.9 8.0
Screw IS-DG5x24 Handle housing, left/right 2.6 3.5
Screw IS-DG5x16 Shroud/gearbox 2.6 3.5
Nut M5 Manifold/carburetor/flange/screw 2.6 3.5
M8x1.25L Carrier/crankshaft 12.5 17.0
Nut M12x1.25 Friction clutch 10.5 14.0
M14x1.25 Spark plug 15 20.0
Remarks:
1) Install screw with medium-strength Loctite 243
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