Baroness LM331, Service Manual, Page: 18 / 165

Nominal
diameter
Heat-treated bolt
Strength classification 8.8 Strength classification 10.9
8 T
8.8
8
tib3yb-002
11T
10.9
11
tib3yb-003
N-m kgf-cm lb-in N-m kgf-cm lb-in
M5 5 - 7 50.99 - 71.38 44.26 - 61.96 7 - 10 71.38 - 101.97 61.96 - 88.51
M6 8 - 11 81.58 - 112.17 70.81 - 97.36 14 - 18 142.76 - 183.55 123.91 - 159.32
M8 23 - 29 234.53 - 295.71 203.57 - 256.68 28 - 38 285.52 - 387.49 247.83 - 336.34
M10 45 - 57 458.87 - 581.23 398.30 - 504.51 58 - 76 591.43 - 774.97 513.36 - 672.68
M12 67 - 85 683.20 - 866.75 593.02 - 752.34 104 - 134 1,060.49 - 1,366.40 920.50 - 1186.03
M14 106 - 134 1,080.88 - 1,366.40 938.21 - 1,186.03 140 - 188 1,427.58 - 1,917.04 1,239.14 - 1,663.99
M16 152 - 188 1,549.94 - 1,917.04 1,345.35 - 1,663.99 210 - 260 2,141.37 - 2,651.22 1,858.71 - 2,301.26
M18 200 - 240 2,039.40 - 2,447.28 1,770.20 - 2,124.24 280 - 340 2,855.16 - 3,466.98 2,478.28 - 3,009.34
M20 245 - 295 2,498.27 - 3,008.12 2,168.50 - 2,611.05 370 - 450 3,772.89 - 4,588.65 3,274.87 - 3,982.95
M22 - - - 530 5,404.41 4,691.03
M24 - - - 670 6,831.99 5,930.17
M27 - - - 1,000 10,197.00 8,851.00
M30 - - - 1,340 14,628.78 11,860.34
Note:
The same values are applied to "fine screw thread."
Hydraulic hose
The tightening torques for union joints and union adaptors with parallel pipe threads (G, PF) are
shown in the table below.
A union joint or adaptor will not become loose or leak as long as it is tightened by the specified
torque.
If fluid leaks from the sealed portion, do not attempt to tighten the union joint or adaptor forcibly.
Examine whether any foreign matter or scratches are present on the seat surface.
Tightening a union joint or adaptor forcibly could damage the connection of the joints.
When tightening a union joint or adaptor, use a torque wrench where possible and firmly tighten it by
an appropriate torque.
Nominal diameter of
the hose size
Nominal diameter of
the parallel pipe
threads (PF)
Tightening torque
N-m kgf-cm lb-in
6 1/4 24.50 250 221.28
9 3/8 49.03 500 564.91
12 1/2 58.84 600 677.89
15 3/4 117.68 1200 1,355.78
19 3/4 117.68 1200 1,355.78
25 1 137.30 1400 1,581.74
32 1-1/4 166.72 1700 1,920.69
38 1-1/2 205.94 2100 2,372.61
50 2 245.17 2500 2,824.54
LM331
Maintenance standards and maintenance
Page 3-6
Tightening torques