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Recommended Torque Settings
The following tables detail the recommended torque settings:
The torques recommended below are for HAND TIGHTENING unplated fasteners
with no lubrication.
When using a bolt or screw in a tapped hole it is assumed that there is sufficient
thread engagement to accept the applied torque. Discretion must be used when
torqueing into a shallow hole or into soft or brittle materials.
Always adhere to engine / gearbox /
torques.
Nuts should be of the same grade as the corresponding bolt or screw.
1 lb ft = 1.35582 Nm
1 lb in = 0.112985 Nm
METRIC SIZES
METRIC BOLT GRADE INTERPRETATION
8x100=800 Mpa
(Ultimate Tensile Stress)
8.8
8x8x10=640 Mpa
(Yield Stress or Stress
at 0.2% permanent set)
METRIC NUT GRADE INTERPRETATION
CURRENT STANDARD :
Nuts which are 0.8xD high.
FUTURE STANDARD :
(Subject to international agreement)
Nuts which are 1.0xD high.
ISO Grade 4.6
400 MPa (25.90 tsi)
ISO Grade 6.9
600 MPa (38.85 tsi)
ISO Metric Coarse -Torques [Nm]
Size
Pitch (mm)
2
T/Stress area (mm )
14.2
ISO Gr. 4.6
ISO Gr. 6.9
ISO Gr. 8.8
ISO Gr. 10.9
ISO Gr. 12.9
ISO Metric Fine -Torques [Nm]
Size
M8
Pitch (mm)
2
T/Stress area (mm )
ISO Gr. 6.9
ISO Gr. 8.8
ISO Gr. 10.9
ISO Gr. 12.9
RESEARCH AND DEVELOPMENT
870984-01
June 1, 1999
1 Nm = 0.737561lb ft
1 Nm = 8.85073 lb in
10x100=1000 Mpa
10.9
10x9x10=900 Mpa
8x100=800 Mpa Proof Stress
|8|
8x100=800 Mpa Proof Stress
8
Manufacturer's
Mark
4.6
Grade (Optional)
Manufacturer's
Mark
6.9
Grade (Optional)
M5
M6
M8
M10
0.8
1
1.25
1.5
20.1
36.6
58
2
4
10
19
5
8.5
21
41
6
10
25
49
8
14
35
69
41
10
17
83
M10
M12
M12
1
1.25
1.25
1.5
39.2
61.2
92.1
88.1
23
44
80
76
27
52
95
90
38
73
135
125
45
88
160
150
Drawing Number 700999/1 rev A
24/6/96
BELL
Equipment etc. manufacturer's specified
(Ultimate Tensile Stress)
(Yield Stress or Stress
at 0.2% permanent set)
ISO Grade 8.8
800 MPa (51.80 tsi)
ISO Grade 10.9
1000 MPa (64.75 tsi)
ISO Grade 12.9
1200 MPa (77.70 tsi)
M12
M14
M16
M18
1.75
2
2
2.5
84.3
115
157
193
34
58
85
115
72
115
180
245
86
135
210
290
120
190
295
400
145
230
355
485
M14
M16
M18
M20
1.5
1.5
1.5
1.5
125
167
216
272
125
190
275
385
150
225
325
460
210
315
460
640
250
380
550
770
12x100=1200 Mpa
(Ultimate Tensile Stress)
12.9
12x9x10=1080 Mpa
(Yield Stress or Stress
at 0.2% permanent set)
8.8
10.9
12.9
M20
M22
M24
M27 M30 M36
2.5
2.5
3
3
245
303
353
459
165
220
285
420
345
465
600
890
410
550
710
1050
580
780
1000
1500
690
930
1200
1800
M22
M24
M27
M30
1.5
2
2
2
333
384
496
621
520
650
970
1350
610
780
1150
1600
860
1100
1600
2250
1050
1300
1950
2700
Manufacturer's
Mark
Grade
Manufacturer's
Mark
Grade
Manufacturer's
Mark
Grade
3.5
4
561
817
980
560
1200
2118
1450
2520
2000
3430
2400
4100
X000386
5
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