N·mN·m
Bolt’s diameterBolt’s diameter
GradeGrade
4.6 4.6 5.6 5.6 6.6 6.6 8.88.8
6 6 44
~~
5 5 55
~~
7 7 66
~~
8 8 99
~~
1212
8 8 1010~~12 1212 12~~15 1415 14~~18 2218 22~~2929
10 2010 20
~~
25 2525 25
~~
31 2931 29
~~
39 4439 44
~~
5858
12 3512 35~~44 4444 44~~54 4954 49~~64 7664 76~~107107
14 5414 54~~69 6969 69~~88 8388 83~~98 12198 121~~162162
16 8816 88~~108 108108 108~~137 127137 127~~157 189157 189~~252252
18 11818 118~~147 147147 147~~186 176186 176~~216 260216 260~~347347
20 16720 167
~~
206 206206 206
~~
265 245265 245
~~
314 369314 369
~~
492492
22 22522 225
~~
284 284284 284
~~
343 343343 343
~~
431 502431 502
~~
669669
24 29424 294
~~
370 370370 370
~~
441 441441 441
~~
539 638539 638
~~
850850
27 44127 441~~519 539519 539~~686 637686 637~~784 933784 933~~12441244
NoteNote
·Use entirely 8.8 grade bolt in the ·Use entirely 8.8 grade bolt in the important joint position.important joint position.
··
Bolt’s grade can be found in the head of the bolt, if it can’t be Bolt’s grade can be found in the head of the bolt, if it can’t be found, the grade is 8.8.found, the grade is 8.8.