Tightening Bolts And Nuts - Hardi COMMANDER DELTA FORCE Instruction Book

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.
Material: Surface treated steel
Bolt size Recommended
(metric) torque (Nm)
M4 2.4
M5 5
M6 8
M8 20
M10 39
M12 70
M14 112
M16 180
M18 240
M20 350
M22 490
M24 600
M27 976
M30 1300
*Exceeding this value results in a great risk of deforming the bolt.
±
WARNING! Applying too little torque will result in these risks:
• 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.
±
WARNING! Exceeding the maximum torque will result in these risks:
• damaging or stripping the threads and deforming the bolt
• 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.
Maximum torque
(Nm)*
3
6
10
25
50
85
140
215
305
435
590
750
1100
1495
6 - Maintenance
Material: Stainless steel
Bolt size Recommended
(metric) torque (Nm)
M4 1.7
M5 3.5
M6 5.6
M8 14
M10 27
M12 49
M14 78
M16 126
M18 168
M20 245
M22 343
M24 420
M27 683
M30 910
Maximum torque
(Nm)*
2.1
4.2
7.0
17.5
35
60
98
151
214
305
413
525
770
1047
135