Metric Bolt Torque Specifications; Bolt Head Identification Mark - Shibaura ST333 Workshop Manual

1. METRIC BOLT TORQUE SPECIFICATIONS

Bolt Size Grade No.
4T, 4.8
M6 7T, 8T, 8.8
10T, 11T
4T, 4.8
M8 7T, 8T, 8.8
10T, 11T
4T, 4.8
M10 7T, 8T, 8.8
10T, 11T
4T, 4.8
M12 7T, 8T, 8.8
10T, 11T
4T, 4.8
M14 7T, 8T, 8.8
10T, 11T
4T, 4.8
M16 7T, 8T, 8.8
10T, 11T
4T, 4.8
M18 7T, 8T, 8.8
10T, 11T
4T, 4.8
M20 7T, 8T, 8.8
10T, 11T

Bolt head identification mark

Coarse Thread
Pitch (mm) Newton Meters
4.9-6.9
1.0 8.3-11.3
11.7-15.7
12.7-16.7
1.25 22.6-28.4
28.5-36.3
25.5-33.3
1.5 44.1-55.9
54.0-69.6
37.3-47.0
1.75 65.7-83.3
92.0-116
62.8-80.4
2.0 104-132
139-175
86.1-110
2.0 149-185
205-255
113-141
2.0 196-236
275-333
144-180
2.5 240-290
363-441
Strength grade
4.8
8.8
10.9
004Y
Kilo-gram
Pitch (mm)
Meters
0.5-0.6
0.85-1.15 - - - - -
1.2-1.6
1.3-1.7
2.3-2.9 1.0
2.9-3.7
2.6-3.4
4.5-5.7 1.25
5.5-7.1
3.8-4.8
6.7-8.5 1.25
9.4-11.8
6.4-8.2
10.6-13.4 1.5
14.2-17.8
8.8-11.2
15.2-18.8 1.5
21-26
11.6-14.4
20-24 1.5
28-34
14.7-18.3
24.5-29.5 1.5
37-45
Example
4.8
6
Fine Thread
Newton-
Kilo-gram Meters
Meters
- - - - - - - - - -
15.2-20.1 1.55-2.05
26.5-34.3 2.7-3.5
30.4-40.2 3.1-4.1
28.4-36.2 2.9-3.7
49.0-62.7 5.0-6.4
57.8-73.5 5.9-7.5
43.1-54.9 4.4-5.6
74.5-94.1 7.6-9.6
99.0-126 10.1-12.9
69.6-87.2 7.1-8.9
117-148 11.9-15.1
149-184 15.2-18.8
91.1-114 9.3-11.7
157-192 16.0-19.6
221-269 22.5-27.5
132-162 13.4-16.6
231-279 23.5-28.5
298-367 30.5-37.5
172-210 17.5-21.5
275-333 28.0-34.0
397-485 40.5-49.5
Indicates yield point,
80% of tensile strength
32 kgf/mm
Tensile strength
2
40 kgf/mm
2