Kubota U20-3 User Manual

U20-3, U25-3 WSM General
I-13
(8) Tightening torque of bolts and nuts
Refer to the tightness torque table below.
(9) Types and materials of bolts and nuts
[ex. bolts]
Bolts, Nuts
Nominal Dia.
4T 7T 9T
SS41 S40C, S45C SCr4
M6
7.8 ~ 9.3 N·m
0.80 ~ 0.95 kgf·m
9.8 ~ 11.3 N·m
1.00 ~ 1.15 kgf·m
12.3 ~ 14.2 N·m
1.25 ~ 1.45 kgf·m
M8
17.7 ~ 20.6 N·m
1.80 ~ 2.10 kgf·m
23.5 ~ 27.5 N·m
2.40 ~ 2.80 kgf·m
29.4 ~ 34.3 N·m
3.00 ~ 3.50 kgf·m
M10
39.2 ~ 45.1 N·m
4.00 ~ 4.60 kgf·m
48.0 ~ 55.9 N·m
4.90 ~ 5.70 kgf·m
60.8 ~ 70.6 N·m
6.20 ~ 7.20 kgf·m
M12
62.8 ~ 72.6 N·m
6.40 ~ 7.40 kgf·m
77.5 ~ 90.2 N·m
7.90 ~ 9.20 kgf·m
103.0 ~ 117.7 N·m
10.50 ~ 12.00 kgf·m
M14
107.9 ~ 125.5 N·m
11.00 ~ 12.80 kgf·m
123.6 ~ 147.1 N·m
12.60 ~ 15.0 kgf·m
166.7 ~ 196.1 N·m
17.00 ~ 20.00 kgf·m
M16
166.7 ~ 191.2 N·m
17.00 ~ 19.50 kgf·m
196.1 ~ 225.6 N·m
20.00 ~ 23.00 kgf·m
259.9 ~ 304.0 N·m
26.50 ~ 31.00 kgf·m
M18
245.2 ~ 284.4 N·m
25.00 ~ 29.0 kgf·m
274.6 ~ 318.7 N·m
28.00 ~ 32.50 kgf·m
343.2~ 402.1 N·m
35.00 ~ 41.00 kgf·m
M20
333.4~ 392.2 N·m
34.00 ~ 40.00 kgf·m
367.7 ~ 431.5 N·m
37.50 ~ 44.0 kgf·m
519.8 ~ 568.8 N·m
53.00 ~ 58.00 kgf·m
Types Material Tensile strength Hardness Bolt head marking
4T SS41
Over 392 MPa
4000 kgf/cm
2
H
R
B
62 ~ 98
No mark or marked 4
7T
S40C
S45C
Over 686 MPa
7000 kgf/cm
2
H
R
C
20 ~ 28
Marked 7
9T SCr4
Over 882 MPa
9000 kgf/cm
2
H
R
C
28 ~ 34
Marked 9

Kubota U20-3 Specifications

General

Brand	Kubota
Model	U20-3
Category	Excavators
Language	English