MacDon FlexDraper FD140 - Chapter 8: Reference; Torque Specifications; Metric Bolt Specifications

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8 Reference
8.1 Torque Specifications
The following tables provide correct torque values for various bolts, cap screws, and hydraulic fittings.
• Tighten all bolts to torque values specified in charts (unless otherwise noted throughout this manual).
• Replace hardware with same strength and grade of bolt.
• Use torque value tables as a guide and periodically check tightness of bolts.
• Understand torque categories for bolts and cap screws by using their identifying head markings.
Jam nuts
When applying torque to finished jam nuts, multiply the torque applied to regular nuts by f=0.65.
Self-tapping screws
Standard torque is to be used (NOT to be used on critical or structurally important joints).
8.1.1 Metric Bolt Specifications
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Figure 8.1: Bolt Grades
Table 8.1 Metric Class 8.8 Bolts and Class 9 Free
Spinning Nut
Nominal
Size (A)
Torque (Nm)
Torque (lbf·ft)
(*lbf·in)
Min. Max. Min. Max.
3-0.5 1.4 1.6
*13 *14
3.5-0.6 2.2 2.5
*20 *22
4-0.7 3.3 3.7
*29 *32
5-0.8 6.7
7.4
*59 *66
6-1.0 11.4 12.6
*101 *112
8-1.25 28 30 20 23
10-1.5
55
60 40 45
12-1.75 95 105 70 78
14-2.0 152 168 113 124
16-2.0 236 261 175 193
20-2.5 460 509 341 377
24-3.0 796 879 589 651