6 - Maintenance
90
Tightening Bolts and Nuts
When tightening bolts and nuts as a part of periodic service or due to replacement of spare parts, it is important to apply
the correct torque. This will prevent accidents and prolong the lifetime of the parts included in the bolted joints.
If not otherwise stated in this book, please tighten bolts and nuts using the following torques.
±
WARNING! Applying too little torque will result in these risks:
±
WARNING! Exceeding the maximum torque will result in these risks:
Bolt size Recommended
torque (Nm)
Maximum
torque (Nm)
M4 2.4 3
M5 5 6
M6 8 10
M8 20 25
M10 39 50
M12 70 85
M14 112 140
M16 180 215
M18 240 305
M20 350 435
M22 490 590
M24 600 750
M27 976 1100
M30 1300 1495
• bolted joints will rattle and thus fail under fatigue
• bolts are being worn quickly and thus will not fulfil their design purpose
• bolted joints will come loose
• accidents caused by assembled parts coming apart due to bolts or nuts failing or falling off.
• damaging or stripping the threads and deforming the fastener
• bolt heads will be broken
• bolted joints will come loose
• accidents caused by assembled parts coming apart due to bolts breaking at a later time.
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