STIHL 019 T
5
2.6 Tightening
Torques
Plastoform screws are used for polymer components and "DG" screws for 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
Spline screw
Spline screw
Spline screw
Spline screw
Spline screw
Spline screw
Spline screw
Spline screw
Collar screw
Spline screw
Collar nut
Plastoform screw
Screw
Thread
size
IS-DG 4x20
IS-DG 5x24
IS-DG 5x24
IS-DG 5x24
IS-DG 5x24
IS-DG 5x24
IS-DG 5x24
IS-DG 5x24
IS-DG 8x18
IS-M5x52
M8x1
M12x1 L
M14x1.25
IS-P4x12
IS-DG 3.5x12
For component
Ignition module/cylinder
Handle molding/front handle
Fan housing/engine housing
Engine pan/cylinder
Handle molding/handle
Muffler/cylinder
Spacer flange/cylinder
Engine housing/cylinder
Bar mounting/engine housing
Intake casing/carburetor/flange
Flywheel
Clutch
Spark plug
Hand guard, left/fan housing
Support plate /diaphragm/
spacer flange
Torque
Nm
Ibf.ft
4.5
3.3
3.5
2.6
4.0
3.0
8.0
5.9
4.0
3.0
7.0
5.2
8.0
5.9
8.0
5.9
16.0
11.8
5.0
3.7
28.0
21.0
50.0
37.0
25.0
18.5
1.7
1.3
2.0
1.5
Remarks
Use the following procedure when refitting a P or DG screw in an existing thread:
- Place the 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 joint.
Note:
Power screwdriver speed for use in polymer: Plastoform screws max. 600 rpm,
DG screws max. 500 rpm.
Use only screws specified in parts list.
Do not use screws with underhead locking teeth on polymer components.
