Kubota K008-3 Workshop Manual page 17

(8)Tightening torque of bolts and nuts
Refer to the tightness torque table below.
Bolts, Nuts
Nomial Dia.
M6
M8
M10
M12
M14
M16
M18
M20
(9)Types and materials of bolts and nuts
[ex. bolts]
Types Material
4T SS41
S40C
7T
S45C
9T SCr4
4T
SS41
7.8 ~ 9.3 N·m
0.80 ~ 0.95 kgf·m
5.8 ~ 6.9 ft·lbf
17.7 ~ 20.6 N·m
1.80 ~ 2.10 kgf·m
13.0 ~ 15.2 ft·lbf
39.2 ~ 45.1 N·m
4.00 ~ 4.60 kgf·m
28.9 ~ 33.3 ft·lbf
62.8 ~ 72.6 N·m
6.40 ~ 7.40 kgf·m
46.3 ~ 53.5 ft·lbf
107.9 ~ 125.5 N·m
11.00 ~ 12.80 kgf·m
79.6 ~ 92.6 ft·lbf
166.7 ~ 191.2 N·m
17.00 ~ 19.50 kgf·m
123.0 ~ 141.0 ft·lbf
245.2 ~ 284.4 N·m
25.00 ~ 29.0 kgf·m
180.8 ~ 209.7 ft·lbf
333.4~ 392.2 N·m
34.00 ~ 40.00 kgf·m
245.9 ~ 389.3 ft·lbf
Tensile strength Hardness
Over 392 MPa
H B
R
2
4000 kgf/cm
62 ~ 98
2
56892 lbf/in
Over 686 MPa
H C
R
2
7000 kgf/cm
20 ~ 28
2
99561 lbf/in
Over 882 MPa
H C
R
2
9000 kgf/cm
28 ~ 34
2
128007 lbf/in
I S-14
-
7T
S40C, S45C
9.8 ~ 11.3 N·m
1.00 ~ 1.15 kgf·m
7.2 ~ 8.3 ft·lbf
23.5 ~ 27.5 N·m
2.40 ~ 2.80 kgf·m
17.4 ~ 20.3 ft·lbf
48.0 ~ 55.9 N·m
4.90 ~ 5.70 kgf·m
35.4 ~ 41.2 ft·lbf
77.5 ~ 90.2 N·m
7.90 ~ 9.20 kgf·m
57.1 ~ 66.5 ft·lbf
123.6 ~ 147.1 N·m
12.60 ~ 15.0 kgf·m
91.1 ~ 108.5 ft·lbf
196.1 ~ 225.6 N·m
20.00 ~ 23.00 kgf·m
144.7 ~ 166.4 ft·lbf
274.6 ~ 318.7 N·m
28.00 ~ 32.50 kgf·m
202.5 ~ 235.1 ft·lbf
367.7 ~ 431.5 N·m
37.50 ~ 44.0 kgf·m
271.2 ~ 318.2 ft·lbf
Bolt head marking
No mark or marked 4
Marked 7
Marked 9
9T
SCr4
12.3 ~ 14.2 N·m
1.25 ~ 1.45 kgf·m
9.0 ~ 10.5 ft·lbf
29.4 ~ 34.3 N·m
3.00 ~ 3.50 kgf·m
21.7 ~ 25.3 ft·lbf
60.8 ~ 70.6 N·m
6.20 ~ 7.20 kgf·m
44.8 ~ 52.1 ft·lbf
103.0 ~ 117.7 N·m
10.50 ~ 12.00 kgf·m
75.9~ 86.8 ft·lbf
166.7 ~ 196.1 N·m
17.00 ~ 20.00 kgf·m
123.0 ~ 144.7 ft·lbf
259.9 ~ 304.0 N·m
26.50 ~ 31.00 kgf·m
191.7 ~ 224.2 ft·lbf
343.2~ 402.1 N·m
35.00 ~ 41.00 kgf·m
253.2 ~ 296.5 ft·lbf
519.8 ~ 568.8 N·m
53.00 ~ 58.00 kgf·m
383.3 ~ 419.5 ft·lbf
Courtesy of Machine.Market