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 detrimentally affecting 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 For component Torque Remarks
size Nm lbf.ft
Plastoform screw P6x14 Line limiting blade/deflector 2.5 1.8
Nut M5 Filter housing/carburetor/
spacer flange 3.5 2.6
Pan head screw 8-32 Clutch drum/crankshaft 4.0 3.0
Spline screw IS-DG5x24 Fixing screw for clutch drum
in engine housing 4.5 3.3 1)
Spline screw IS-DG5x60 Engine pan/crankcase/cylinder 9.0 6.6 2)
3/8" Clutch carrier 17.0 12.5
Spline screw IS-DG5x24 Engine housing/shroud 4.5 3.3 1)
Spline screw IS-DG5x24 Engine housing/crankcase 9.0 6.6 1)
Spline screw IS-DG5x60 Muffler/cylinder 9.0 6.6 2)
M14x1.25 Stub/muffler 15.0 11.0 3)
Pan head screw M5x8 Drive tube/guide 8.0 5.9
Spline screw IS-DG5x12 Drive tube/engine housing 2.0 1.5 1)
Spline screw IS-DG5x20 Starter cover/crankcase 6.0 4.4 1)
Spline screw IS-DG5x20 Starter cover/engine pan 6.0 4.4 1)
M8 Starter cup 17.0 12.5
Spline screw IS-DG5x24 Spacer flange/cylinder 6.0 4.4 2)
M14x1.25 Spark plug 20.0 15.0
Spline screw IS-DG4x20 Ignition module/cylinder 4.5 3.3 2)
Spline screw IS-DG5x24 Bracket/fuel tank 4.0 3.0 1)
Use the following procedure to fit a DG or P screw in an existing thread:
– Place the DG or P screw in the hole and rotate it counterclockwise until it drops down slightly.
– Tighten the screw clockwise to the specified torque.
This procedure ensures that the screw engages properly in the existing thread and does not form a new thread
and weaken the assembly.
Note: Power screwdriver speed settings for polymer: Plastoform screws max. 600 rpm,
DG screws max. 500 rpm
Important: Do not confuse screws with and without underhead locking teeth.
1) With locking teeth
2) Without locking teeth
3) Install with sealant
3.5 Tightening Torques
FS 45 5
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