Tightening Torque of Standard Bolts
GI-39spec tableTightening torque (Without lubricant)
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
NOTE
1. Special parts are excluded.
2. This standard is applicable to bolts having the following marks embossed on the bolt head. Grade 4T = Mark 4, Grade 7T = Mark 7, Grade 9T = Mark 9.
*: Nominal diameter. In bolt designation M6: 6 = Nominal diameter of bolt threads (Unit: mm), M = Metric screw threads.