Maeda MC305C-3 - Special Tools and Standard Tightening Torque; 7 B a Ccessory Tools; 8 B S Tandard Tightening Torque List; Bolt and Nut Tightening Torque

M A E D A Mini-Crawler Crane Section 5 – SPECIAL TOOLS AND STANDARD TIGHTENING TORQUE
3/2019 MC305C-3 5-15
SPECIAL TOOLS AND STANDARD TIGHTENING TORQUE
47BAccessory Tools
Contact us or our sales service agency to request special tools for inspection and maintenance, when
necessary.
48BStandard Tightening Torque List
Bolt and Nut Tightening Torque
Torque metric bolts and nuts with no specific indication to the values shown in this table.
Adequate tightening torque is determined with respect to the width across the flat (b) of the bolt or nut.
Fig. 5-21
Bolts Marked with 8.8 (Strength Classification) on Head
Nominal Size
(Mark "a")
Width Across
Flat
(Mark "b")
Target Value
Tolerance
mm
mm
N·m
kgf·m
N·m
kgf·m
6
10
7.8
0.80
6.8-9.0
0.70-0.92
8
13
19.0
1.95
16.5-21.9
1.70-2.24
10
17
37.5
3.85
32.6-43.1
3.35-4.43
12
19
65.5
6.70
57.0-75.3
5.85-7.70
14
22
104
10.6
90.4-120
9.2-12.2
16
24
163
16.6
142-187
14.4-19.1
18
27
224
22.8
195-258
19.8-26.2
20
30
318
32.4
277-366
28.2-37.3
22
32
432
44.0
376-497
38.3-50.6
24
36
549
56.0
477-631
48.7-64.4
27
41
804
81.9
699-925
71.2-94.2
30
46
1090
111
948-1250
96.5-128
33
50
1485
151
1290-1710
131-174
36
55
1910
194
1660-2200
167-223