Metric Bolt And Screw Torque Values - Worldwide Construction And Forestry Division 380GLC Operator's Manual

Metric Bolt and Screw Torque Values

TS1742 —UN—31MAY18
4.8
Class 4.8
a
Bolt or Screw Hex Head
Size
N·m lb·in
M6 3.6 31.9
M8 8.6 76.1
M10 16.9 150
N·m lb·ft
— —
M12
— —
M14
— —
M16
— —
M18
— —
M20
— —
M22
— —
M24
— —
M27
— —
M30
— —
M33
— —
M36
The nominal torque values listed are for general use only with the assumed
wrenching accuracy of 20%, such as a manual torque wrench.
DO NOT use these values if a different torque value or tightening procedure is
given for a specific application.
For lock nuts, for stainless steel fasteners, or for nuts on U-bolts, see the
tightening instructions for the specific application.
•
Make sure that fastener threads are clean.
•
Apply a thin coat of Hy-Gard™ or equivalent oil under the head and on the threads of the fastener, as shown in the following image.
•
Be conservative with the amount of oil to reduce the potential for hydraulic lockup in blind holes due to excessive oil.
•
Properly start thread engagement.
TS1741 —UN—22MAY18
a
Hex head column values are valid for ISO 4014 and ISO 4017 hex head, ISO 4162 hex socket head, and ISO 4032 hex nuts.
b
Hex flange column values are valid for ASME B18.2.3.9M, ISO 4161, or EN 1665 hex flange products.
Miscellaneous—Machine
4.8 4.8 8.8
8.8
Class 8.8 or 9.8
Flange Hex Head
b
Head
N·m lb·in N·m lb·in
3.9 34.5 6.7 59.3
9.4 83.2 16.2 143
N·m lb·ft N·m lb·ft
18.4 13.6 31.9 23.5
— —
55 40.6
— —
87 64.2
— —
135 99.6
— —
193 142
— —
272 201
— —
365 263
— —
468 345
— —
683 504
— —
932 687
— —
1258 928
— —
1617 1193
9.8 10.9
9.8 10.9
Class 10.9
a
Flange Hex Head
b
Head
N·m lb·in N·m lb·in
7.3 64.6 9.8 86.7
N·m lb·ft
17.6 156 23.8 17.6
N·m lb·ft
34.7 25.6 46.8 34.5
61 45 81 59.7
96 70.8 128 94.4
149 110 198 146
214 158 275 203
301 222 387 285
405 299 520 384
518 382 666 491
758 559 973 718
1029 759 1327 979
1398 1031 1788 1319
1789 1319 2303 1699
Replace fasteners with the same or higher property class. If
higher property class fasteners are used, tighten these to the
strength of the original.
4-1-20
12.9
12.9
Class 12.9
a
Flange Hex Head
b
Head
N·m lb·in N·m lb·in
10.8 95.6 11.5 102
N·m lb·ft N·m lb·ft
25.9 19.1 27.8 20.5
51 37.6 55 40.6
89 65.6 95 70.1
141 104 150 111
219 162 232 171
304 224 322 245
428 316 453 334
576 425 608 448
738 544 780 575
1080 797 1139 840
1466 1081 1553 1145
1986 1465 2092 1543
2548 1879 2695 1988
a
Flange
b
Head
N·m lb·in
12.6 112
N·m lb·ft
30.3 22.3
60 44.3
105 77.4
165 122
257 190
356 263
501 370
674 497
864 637
1263 932
1715 1265
2324 1714
2982 2199
DX,TORQ2 -19-30MAY18-1/1
092221
PN=205