TIGHTENING TORQUE OF STANDARD BOLTS
GI-20spec tableTightening Torque of Standard Bolts (Without lubricant)
| Grade | Bolt size | Bolt diameter* mm | Pitch mm | Hexagon head bolt N·m | Hexagon head bolt kg·m | Hexagon head bolt ft·lb | Hexagon flange bolt N·m | Hexagon flange bolt kg·m | Hexagon flange bolt ft·lb |
|---|---|---|---|---|---|---|---|---|---|
| 4T | M6 | 6.0 | 1.0 | 5.1 | 0.52 | 3.8 | 6.1 | 0.62 | 4.5 |
| 4T | M8 | 8.0 | 1.25 | 13 | 1.3 | 9 | 15 | 1.5 | 11 |
| 4T | M8 | 8.0 | 1.0 | 13 | 1.3 | 9 | 16 | 1.6 | 12 |
| 4T | M10 | 10.0 | 1.5 | 25 | 2.5 | 18 | 29 | 3.0 | 22 |
| 4T | M10 | 10.0 | 1.25 | 25 | 2.6 | 19 | 30 | 3.1 | 22 |
| 4T | M12 | 12.0 | 1.75 | 42 | 4.3 | 31 | 51 | 5.2 | 38 |
| 4T | M12 | 12.0 | 1.25 | 46 | 4.7 | 34 | 56 | 5.7 | 41 |
| 4T | M14 | 14.0 | 1.5 | 74 | 7.5 | 54 | 88 | 9.0 | 65 |
| 7T | M6 | 6.0 | 1.0 | 8.4 | 0.86 | 6.2 | 10 | 1.0 | 7 |
| 7T | M8 | 8.0 | 1.25 | 21 | 2.1 | 15 | 25 | 2.5 | 18 |
| 7T | M8 | 8.0 | 1.0 | 22 | 2.2 | 16 | 26 | 2.7 | 20 |
| 7T | M10 | 10.0 | 1.5 | 41 | 4.2 | 30 | 48 | 4.9 | 35 |
| 7T | M10 | 10.0 | 1.25 | 43 | 4.4 | 32 | 51 | 5.2 | 38 |
| 7T | M12 | 12.0 | 1.75 | 71 | 7.2 | 52 | 84 | 8.6 | 62 |
| 7T | M12 | 12.0 | 1.25 | 77 | 7.9 | 57 | 92 | 9.4 | 68 |
| 7T | M14 | 14.0 | 1.5 | 127 | 13.0 | 94 | 147 | 15.0 | 108 |
| 9T | M6 | 6.0 | 1.0 | 12 | 1.2 | 9 | 15 | 1.5 | 11 |
| 9T | M8 | 8.0 | 1.25 | 29 | 3.0 | 22 | 35 | 3.6 | 26 |
| 9T | M8 | 8.0 | 1.0 | 31 | 3.2 | 23 | 37 | 3.8 | 27 |
| 9T | M10 | 10.0 | 1.5 | 59 | 6.0 | 43 | 70 | 7.1 | 51 |
| 9T | M10 | 10.0 | 1.25 | 62 | 6.3 | 46 | 74 | 7.5 | 54 |
| 9T | M12 | 12.0 | 1.75 | 98 | 10.0 | 72 | 118 | 12.0 | 87 |
| 9T | M12 | 12.0 | 1.25 | 108 | 11.0 | 80 | 137 | 14.0 | 101 |
| 9T | M14 | 14.0 | 1.5 | 177 | 18.0 | 130 | 206 | 21.0 | 152 |
4T
Bolt sizeM6
Bolt diameter* mm6.0
Pitch mm1.0
Hexagon head bolt N·m5.1
Hexagon head bolt kg·m0.52
Hexagon head bolt ft·lb3.8
Hexagon flange bolt N·m6.1
Hexagon flange bolt kg·m0.62
Hexagon flange bolt ft·lb4.5
4T
Bolt sizeM8
Bolt diameter* mm8.0
Pitch mm1.25
Hexagon head bolt N·m13
Hexagon head bolt kg·m1.3
Hexagon head bolt ft·lb9
Hexagon flange bolt N·m15
Hexagon flange bolt kg·m1.5
Hexagon flange bolt ft·lb11
4T
Bolt sizeM8
Bolt diameter* mm8.0
Pitch mm1.0
Hexagon head bolt N·m13
Hexagon head bolt kg·m1.3
Hexagon head bolt ft·lb9
Hexagon flange bolt N·m16
Hexagon flange bolt kg·m1.6
Hexagon flange bolt ft·lb12
4T
Bolt sizeM10
Bolt diameter* mm10.0
Pitch mm1.5
Hexagon head bolt N·m25
Hexagon head bolt kg·m2.5
Hexagon head bolt ft·lb18
Hexagon flange bolt N·m29
Hexagon flange bolt kg·m3.0
Hexagon flange bolt ft·lb22
4T
Bolt sizeM10
Bolt diameter* mm10.0
Pitch mm1.25
Hexagon head bolt N·m25
Hexagon head bolt kg·m2.6
Hexagon head bolt ft·lb19
Hexagon flange bolt N·m30
Hexagon flange bolt kg·m3.1
Hexagon flange bolt ft·lb22
4T
Bolt sizeM12
Bolt diameter* mm12.0
Pitch mm1.75
Hexagon head bolt N·m42
Hexagon head bolt kg·m4.3
Hexagon head bolt ft·lb31
Hexagon flange bolt N·m51
Hexagon flange bolt kg·m5.2
Hexagon flange bolt ft·lb38
4T
Bolt sizeM12
Bolt diameter* mm12.0
Pitch mm1.25
Hexagon head bolt N·m46
Hexagon head bolt kg·m4.7
Hexagon head bolt ft·lb34
Hexagon flange bolt N·m56
Hexagon flange bolt kg·m5.7
Hexagon flange bolt ft·lb41
4T
Bolt sizeM14
Bolt diameter* mm14.0
Pitch mm1.5
Hexagon head bolt N·m74
Hexagon head bolt kg·m7.5
Hexagon head bolt ft·lb54
Hexagon flange bolt N·m88
Hexagon flange bolt kg·m9.0
Hexagon flange bolt ft·lb65
7T
Bolt sizeM6
Bolt diameter* mm6.0
Pitch mm1.0
Hexagon head bolt N·m8.4
Hexagon head bolt kg·m0.86
Hexagon head bolt ft·lb6.2
Hexagon flange bolt N·m10
Hexagon flange bolt kg·m1.0
Hexagon flange bolt ft·lb7
7T
Bolt sizeM8
Bolt diameter* mm8.0
Pitch mm1.25
Hexagon head bolt N·m21
Hexagon head bolt kg·m2.1
Hexagon head bolt ft·lb15
Hexagon flange bolt N·m25
Hexagon flange bolt kg·m2.5
Hexagon flange bolt ft·lb18
7T
Bolt sizeM8
Bolt diameter* mm8.0
Pitch mm1.0
Hexagon head bolt N·m22
Hexagon head bolt kg·m2.2
Hexagon head bolt ft·lb16
Hexagon flange bolt N·m26
Hexagon flange bolt kg·m2.7
Hexagon flange bolt ft·lb20
7T
Bolt sizeM10
Bolt diameter* mm10.0
Pitch mm1.5
Hexagon head bolt N·m41
Hexagon head bolt kg·m4.2
Hexagon head bolt ft·lb30
Hexagon flange bolt N·m48
Hexagon flange bolt kg·m4.9
Hexagon flange bolt ft·lb35
7T
Bolt sizeM10
Bolt diameter* mm10.0
Pitch mm1.25
Hexagon head bolt N·m43
Hexagon head bolt kg·m4.4
Hexagon head bolt ft·lb32
Hexagon flange bolt N·m51
Hexagon flange bolt kg·m5.2
Hexagon flange bolt ft·lb38
7T
Bolt sizeM12
Bolt diameter* mm12.0
Pitch mm1.75
Hexagon head bolt N·m71
Hexagon head bolt kg·m7.2
Hexagon head bolt ft·lb52
Hexagon flange bolt N·m84
Hexagon flange bolt kg·m8.6
Hexagon flange bolt ft·lb62
7T
Bolt sizeM12
Bolt diameter* mm12.0
Pitch mm1.25
Hexagon head bolt N·m77
Hexagon head bolt kg·m7.9
Hexagon head bolt ft·lb57
Hexagon flange bolt N·m92
Hexagon flange bolt kg·m9.4
Hexagon flange bolt ft·lb68
7T
Bolt sizeM14
Bolt diameter* mm14.0
Pitch mm1.5
Hexagon head bolt N·m127
Hexagon head bolt kg·m13.0
Hexagon head bolt ft·lb94
Hexagon flange bolt N·m147
Hexagon flange bolt kg·m15.0
Hexagon flange bolt ft·lb108
9T
Bolt sizeM6
Bolt diameter* mm6.0
Pitch mm1.0
Hexagon head bolt N·m12
Hexagon head bolt kg·m1.2
Hexagon head bolt ft·lb9
Hexagon flange bolt N·m15
Hexagon flange bolt kg·m1.5
Hexagon flange bolt ft·lb11
9T
Bolt sizeM8
Bolt diameter* mm8.0
Pitch mm1.25
Hexagon head bolt N·m29
Hexagon head bolt kg·m3.0
Hexagon head bolt ft·lb22
Hexagon flange bolt N·m35
Hexagon flange bolt kg·m3.6
Hexagon flange bolt ft·lb26
9T
Bolt sizeM8
Bolt diameter* mm8.0
Pitch mm1.0
Hexagon head bolt N·m31
Hexagon head bolt kg·m3.2
Hexagon head bolt ft·lb23
Hexagon flange bolt N·m37
Hexagon flange bolt kg·m3.8
Hexagon flange bolt ft·lb27
9T
Bolt sizeM10
Bolt diameter* mm10.0
Pitch mm1.5
Hexagon head bolt N·m59
Hexagon head bolt kg·m6.0
Hexagon head bolt ft·lb43
Hexagon flange bolt N·m70
Hexagon flange bolt kg·m7.1
Hexagon flange bolt ft·lb51
9T
Bolt sizeM10
Bolt diameter* mm10.0
Pitch mm1.25
Hexagon head bolt N·m62
Hexagon head bolt kg·m6.3
Hexagon head bolt ft·lb46
Hexagon flange bolt N·m74
Hexagon flange bolt kg·m7.5
Hexagon flange bolt ft·lb54
9T
Bolt sizeM12
Bolt diameter* mm12.0
Pitch mm1.75
Hexagon head bolt N·m98
Hexagon head bolt kg·m10.0
Hexagon head bolt ft·lb72
Hexagon flange bolt N·m118
Hexagon flange bolt kg·m12.0
Hexagon flange bolt ft·lb87
9T
Bolt sizeM12
Bolt diameter* mm12.0
Pitch mm1.25
Hexagon head bolt N·m108
Hexagon head bolt kg·m11.0
Hexagon head bolt ft·lb80
Hexagon flange bolt N·m137
Hexagon flange bolt kg·m14.0
Hexagon flange bolt ft·lb101
9T
Bolt sizeM14
Bolt diameter* mm14.0
Pitch mm1.5
Hexagon head bolt N·m177
Hexagon head bolt kg·m18.0
Hexagon head bolt ft·lb130
Hexagon flange bolt N·m206
Hexagon flange bolt kg·m21.0
Hexagon flange bolt ft·lb152
1. Special parts are excluded.
2. This standard is applicable to bolts having the following marks embossed on the bolt head.
Grade Marks
| Grade | Mark |
|---|---|
| 4T | 4 |
| 7T | 7 |
| 9T | 9 |
4T
Mark4
7T
Mark7
9T
Mark9
*: Nominal diameter
M 6 — Nominal diameter of bolt threads (Unit: mm) — Metric screw threads