22
MAINTENANCE
ENGLISH
TIGHTENING TORQUE CHART
A
Figure "7" on the top of the bolt indicates that the bolt is of special material.
A
Before tightening, check the figure on the top of bolt.
Thread
Size
d (mm)
Hexa-Bolt
Head size
B (mm)
No mark
7T
lbf-ft
N-m
kgf-m
lbf-ft
N-m
kgf-m
M8
12 or 13
13.0 to 15.2
(14.1
1.1)
17.8 to 20.6
(19.2
1.4)
1.9 to 2.1
(2.0
0.1)
17.5 to 20.3
(18.9
1.4)
23.5 to 27.5
(25.5
2.0)
2.4 to 2.8
(2.6
0.2)
M10
14 or 17
28.9 to 33.3
(31.1
2.2)
39.3 to 45.1
(42.2
2.9)
4.0 to 4.6
(4.3
0.3)
35.4 to 41.2
(38.3
2.9)
48.1 to 55.9
(52.0
3.9)
4.9 to 5.7
(5.3
0.4)
M12
17 or 19
46.3 to 53.5
(49.9
3.6)
62.8 to 72.6
(67.7
4.9)
6.4 to 7.4
(6.9
0.5)
57.1 to 66.5
(61.8
4.7)
77.6 to 90.2
(83.9
6.3)
8.0 to 9.2
(8.6
0.6)
M14
19 or 22
79.6 to 92.6
(86.1
6.5)
107.9 to 125.5
(116.7
8.8)
11.0 to 12.8
(11.9
0.9)
91.1 to 108.5
(99.8
8.7)
123.6 to 147.0
(135.3
11.7)
12.6 to 15.0
(13.8
1.2)
American standard cap screws
with UNC or UNF threads
Metric cap screws
SAE grade No.
GR.5
GR.8
Property class
class 8.8
class 10.9
5/16
(lbf-ft)
(N-m)
(kgf-m)
17 to 20.5
23.1 to 27.8
2.35 to 2.83
24 to 29
32.5 to 39.3
3.31 to 4.01
M8
(lbf-ft)
(N-m)
(kgf-m)
17.4 to 20.2
23.6 to 27.4
2.4 to 2.8
21.7 to 25.3
29.4 to 34.3
3.0 to 3.5
3/8
(lbf-ft)
(N-m)
(kgf-m)
35 to 42
47.5 to 57.0
4.84 to 5.81
45 to 54
61.0 to 73.2
6.22 to 7.46
M10
(lbf-ft)
(N-m)
(kgf-m)
35.5 to 41.2
48.1 to 55.8
4.9 to 5.7
44.9 to 52.1
60.8 to 70.5
6.2 to 7.2
1/2
(lbf-ft)
(N-m)
(kgf-m)
80 to 96
108.5 to 130.2
11.06 to 13.28
110 to 132
149.2 to 179.0
15.21 to 18.25
M12
(lbf-ft)
(N-m)
(kgf-m)
57.2 to 66.5
77.5 to 90.1
7.9 to 9.2
76.0 to 86.8
103 to 117
10.5 to 12.0
9/16
(lbf-ft)
(N-m)
(kgf-m)
110 to 132
149.2 to 179.0
15.21 to 18.25
160 to 192
217.0 to 260.4
22.13 to 26.55
M14
(lbf-ft)
(N-m)
(kgf-m)
91.5 to 108.4
124 to 147
12.6 to 15.0
123 to 144
167 to 196
17.0 to 20.0
5/8
(lbf-ft)
(N-m)
(kgf-m)
150 to 180
203.4 to 244.1
20.74 to 24.89
220 to 264
298.3 to 358.0
30.42 to 36.51
M16
(lbf-ft)
(N-m)
(kgf-m)
145 to 166
196 to 225
20.0 to 23.0
192 to 224
260 to 303
26.5 to 31.0
Summary of Contents for RCK60P-F39
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