Tightening Torques - Stihl FS 120 Service Manual

2.6

Tightening Torques

DG and P screws (Plastoform) are used in polymer and lightmetal components. These screws form a perma-
nent 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
size
Self-tapping screw IS-B3.5x6.5
Self-tapping screw IS-B4.2x9.5
Spline screw IS-DG4x20
Spline screw IS-DG5x24
Spline screw IS-DG5x12
Spline screw IS-DG5x12
Spline screw IS-DG5x20
Spline screw IS-DG5x20
Spline screw IS-DG5x20
Spline screw IS-DG5x20
Spline screw IS-DG5x20
Spline screw IS-DG5x26
Spline screw IS-DG5x24
Spline screw IS-DG5x20
Spline screw IS-DG5x26
Spline screw IS-DG5x24
Spline screw IS-DG5x24
Spline screw IS-DG5x24
Spline screw IS-DG5x24
Spline screw IS-DG5x24
Spline screw IS-DG5x24
Spline screw IS-DG6x28
Spline screw IS-DG5x24
Spline screw IS-DG5x24
Spline screw IS-DG5x25
Collar nut M5
Collar screw M5/P6
Spline screw IS-M5x12
Spline screw IS-M5x16
Spline screw IS-M5x12
Spline screw IS-M5x16
Spline screw IS-M5x30
FS 120, 200, 300, 350, 400, 450, FR 350, 450
For component
Rewind spring/fan housing
Muffler/spark arresting screen
Ignition module/crankcase
Ignition module/crankcase
AV sleeve/drive tube (fixing screw)
Guard ring/gear housing
Fan housing/crankcase
Fan housing/shroud/crankcase
Carburetor housing/crankcase/
cylinder
Filter housing/ground wire/
crankcase
Ground wire/crankcase
Fuel tank/crankcase
Bracket/crankcase
Shroud/clutch housing
Guard plate/fuel tank/
crankcase
Cylinder/crankcase
Muffler/crankcase
Muffler/cylinder
Crankcase
Clutch housing/crankcase
Clutch housing/crankcase
Clutch housing/drive tube
Clutch housing/drive tube
Gear housing/drive tube
Gear housing/drive tube
Stage 1
Stage 2
Filter housing/carburetor housing
Carburetor housing
Clamp/control handle/
drive tube (loop handle)
AV sleeve/drive tube (clamp screw)
Clamp/control handle/drive tube
Clamp/drive tube (for harness)
Control handle (bike handle)
Torque Remarks
Nm lbf.ft
1.5 1.1
2.5 1.8 1) 2)
4.5 3.3 3) 4) 5)
6.0 4.4 1) 2)
2.5 1.8 3)
5.0 3.7 1) 4)
6.0 4.4
6.0 4.4
6.0 4.4
6.0 4.4
6.0 4.4 1) 2)
6.0 4.4
6.0 4.4 1)
6.0 4.4
6.0 4.4 1) 2)
8.5 6.3
8.5 6.3
8.5 6.3
8.5 6.3
8.5 6.3 1) 2) 4) 5)
6.0 4.4 3)
12.0 8.8 1) 6)
8.5 6.3 4)
8.5 6.3 2) 3) 5)
1.5 1.1 1) 4)
7.5 5.5 1) 4)
3.5 2.6
4.0 3.0
2.0 1.5 3) 4)
5.5 4.0 3)
2.0 1.5 2) 5)
4.5 3.3 3)
2.0 1.5 6)
5