Torque specifications – MacDon 963 Harvest Header User Manual
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TORQUE
SPECIFICATIONS
CHECKING BOLT TORQUE
The tables shown below give correct torque values for various bolts and capscrews. Tighten all bolts to the
torques specified in chart unless otherwise noted throughout this manual. Check tightness of bolts periodically,
using bolt torque chart as a guide. Replace hardware with the same strength bolt.
ENGLISH TORQUE SPECIFICATION
NC Bolt Torque*
SAE 5
SAE 8
Bolt
Dia.
"A"
N·m [lb-ft] N·m [lb-ft]
1/4" 12 [9] 15 [11]
5/16" 24 [18] 34 [25]
3/8" 43 [32] 56 [41]
7/16" 68 [50] 95 [70]
1/2" 102 [75] 142 [105]
9/16" 149 [110] 202 [149]
5/8" 203 [150] 271 [200]
3/4"
359 [265] 495 [365]
7/8" 569 [420] 813 [600]
1" 867 [640] 1205 [890]
METRIC TORQUE SPECIFICATIONS
Bolt Torque*
8.8
10.9
Bolt
Dia.
"A"
N·m
[lb-ft]
N·m
[lb-ft]
M3
0.5
[.4]
1.8
[1.3]
M4
3
[2.2]
4.5
[3.3]
M5
6
[4]
9
[7]
M6
10
[7]
15
[11]
M8
25
[18]
35
[26]
M10
50
[37]
70
[52]
M12
90
[66]
125
[92]
M14
140
[103]
200
[148]
M16
225
[166]
310
[229]
M20
435
[321]
610
[450]
M24
750
[553]
1050
[774]
M30
1495
[1103]
2100
[1550]
M36
2600
[1917]
3675
[2710]
Torque figures indicated above are valid for non-greased or non-oiled threads and heads unless otherwise
specified. Do not grease or oil bolts or capscrews unless specified in this manual. When using locking
elements, increase torque values by 5%.
* Torque value for bolts and capscrews are identified by their head markings.