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Section 5 – SPECIAL TOOLS AND STANDARD TIGHTENING TORQUE Mini-Crawler Crane M A E D A
5-16 3/2019 MC305C-3
Bolts Marked with 10.9 (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 11.0 1.1 9.4-12.7 0.93-1.26
8 13 27.0 2.7 23.0-31.1 2.3-3.10
10 17 53.0 5.4 45.0-61.0 4.6-6.21
12 19 93.0 9.5 79.0-107 8.10-10.9
14 22 148 15.1 126-170 12.8-17.4
16 24 231 23.5 196-266 20.0-27.0
18 27 317 32.3 269-365 27.5-37.1
20 30 450 45.9 383-518 39.0-52.8
22 32 612 62.4 520-704 53.0-71.8
24 36 778 79.3 661-895 67.4-91.2
27 41 1130 116 961-1300 98.6-133
30 46 1540 158 1310-1770 134-182
33 50 2100 214 1790-2410 182-246
36 55 2700 275 2300-3100 234-316
Bolts Marked with 12.9 (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 13.0 1.30 11.1-15.0 1.11-1.50
8 13 31.5 3.20 26.8-36.2 2.72-3.70
10 17 62.5 6.40 53.1-71.9 5.44-7.35
12 19 109 11.1 92.7-125 9.44-12.8
14 22 174 17.7 148-200 15.0-20.4
16 24 271 27.7 230-312 23.5-31.9
18 27 373 38.1 317-429 32.4-43.8
20 30 529 54.0 450-608 45.9-62.1
22 32 720 73.4 612-828 62.4-84.4
24 36 915 93.3 778-1050 79.3-107
27 41 1340 136 1140-1540 116-156
30 46 1820 185 1550-2090 157-213
33 50 2470 252 2100-2840 214-290
36 55 3180 324 2700-3660 275-373