Section 5 –
SPECIAL TOOLS AND STANDARD TIGHTENING TORQUE
Mini-Crawler Crane M A E D A
5-8 9/2020 MC285CB-3
SPECIAL TOOLS AND STANDARD TIGHTENING TORQUE
Accessory Tools
Contact us or our sales service agency to request special tools for inspection and maintenance, when
necessary.
Standard 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. 5-3
Bolts Marked with 8.8 (Strength Classification) on Head
Nominal Size
(Mark “a”)
Width Across
Flat
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
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