SHANDONG CARTER HEAVY INDUSTRY MACHINERY CO., LTD.
76
Metric bolts and nuts
Thread dimensions Standard torque (N.m) Thread dimensions Standard torque (N.m)
M6 12±3 M14 160±30
M8 28±7 M16 240±40
M10 55±10 M20 460±60
M12 100±20 M30 1600±200
2. Torque of main components: (N.m)
Thread dimensions Recommended torque
M12 bolts fixing the traveling motor 120±10
M16 bolts fixing the slewing bearing 325±15
M16 bolts fixing the swing mechanism 325±15
Important:
1.
Before installed, the bolts and nuts should be cleaned.
2.
Grease the bolts and the nuts (such as the white zinc b able to be dissolved to lubricant), so as to stabilize their
abrasion coefficient.
3.
The counterweight bolts should be kept tightened up.
Caution: all the tightening torques should be expressed with kgf.m.
For example: use a wrench with 1m long to tighten the bolts and nuts, and apply 12kgf of force to the end of
wrench, generating the following torque:
1m×12kgf=12kgf.m To
generate the same torque with 0.25m wrench: 0.25m×y=12kgf.m Needed
force: y=12kgf.m／0.25m=48kgf
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