Torque Specifications; Metric Bolt Specifications - MacDon M1 Series Unloading And Assembly Instructions

6.3 Torque Specifications

The following tables provide torque values for various bolts, cap screws, and hydraulic fittings. Use these values only when
no other torque value has been specified in a given procedure.
• Tighten all bolts to the torque values specified in the charts below, unless you are directed otherwise in this manual.
• Replace removed hardware with hardware of the same strength and grade.
• Use the torque value tables as a guide when periodically checking the tightness of bolts.
• Understand the torque categories for bolts and cap screws by reading the markings on their heads.
Jam nuts
Jam nuts require less torque than nuts used for other purposes. When applying torque to finished jam nuts, multiply the
torque applied to regular nuts by 0.65 to obtain the modified torque value.
Self-tapping screws
Use the standard torque values when installing self-tapping screws. Do NOT install self-tapping screws on structural or
otherwise critical joints.

6.3.1 Metric Bolt Specifications

The torque values provided in the following metric bolt torque tables apply to hardware installed dry; that is, hardware
with no grease, oil, or threadlocker on the threads or heads. Do NOT grease or oil bolts or cap screws unless directed to do
so in this manual.
Table 6.3 Metric Class 8.8 Bolts and Class 9 Free Spinning Nut
Torque (Nm)
Nominal
Size (A)
Min.
3-0.5 1.4
3.5-0.6 2.2
4-0.7 3.3
5-0.8 6.7
6-1.0 11.4
8-1.25 28
55
10-1.5
12-1.75 95
14-2.0 152
16-2.0 236
20-2.5 460
24-3.0 796
215620
Torque (lbf·ft) (*lbf·in)
Max. Min. Max.
1.6
*13
2.5 *20
3.7
*29
7.4
*59
12.6
*101 *112
30 20
60 40
105 70
168 113
261 175
509 341
879 589
REFERENCE
*14
*22
*32
*66
23
45
78
124 Figure 6.1: Bolt Grades
193
377
651
240
Revision A