Tightening Torques; Standard Tightening Torques - Baroness TDA1200 Service Manual

TDA1200・TDA1600
Maintenance standards and maintenance

Tightening torques

Standard tightening torques

Bolts and Nuts
Important
A number of bolts are used in each part of this machine.
Be sure to re-tighten the bolts and nuts, because they may be loosened at the earlier stage of the
use.
As to the bolts and nuts without any special instruction, tighten them in appropriate tightening torque
with proper tool.
Too much tightening may cause the looseness or damage of the screw.
The strength of tightening is determined by types of screws, strength, the friction of thread face or
base face and others.
The table below is for the galvanized or parkerized bolts.
In case that the strength of internal thread is weak, it is not applied.
Do not use rusty or sand attached "screw."
Otherwise, it may cause insufficient tightening even if you apply the specified tightening torque.
The friction of the screw face becomes higher and the tightening torque is canceled out by the
friction, therefore sufficient tightening cannot be applied.
If "screw" is wet by water or oil, do not tighten it with normal tightening torque.
If the screw is wet, the torque coefficient will get smaller and it may result in too much tightening.
Too much tightening may cause looseness by the screw stretched or result in damage.
Do not use a bolt experienced too much burden.
Using the impact wrench requires the skill.
Do exercise as much as possible for steady tightening.
Nominal
diameter
N-m
M5 3 - 5
M6 7 - 9
M8 14 - 19
M10 29 - 38
M12 52 - 67
M14 70 - 94
M16 88 - 112
M18 116 - 144
M20 147 - 183
M22 295
M24 370
M27 550
M30 740
Page 3-4
General bolt
Strength classification 4.8
4 T
M
4.8
tib3yb-001
kgf-cm
30.59 - 50.99 26.55 - 44.26
71.38 - 91.77 61.96 - 79.66
142.76 - 193.74 123.91 - 168.17
295.71 - 387.49 256.68 - 336.34
530.24 - 683.20 460.25 - 593.02
713.79 - 958.52 619.57 - 831.99
897.34 - 1142.06 778.89 - 991.31
1,182.85 - 1,468.37 1,026.72 - 1,274.54
1,498.96 - 1,866.05 1,301.10 - 1,619.73
3,008.12 2,611.05
3,772.89 3,274.87
5,608.35 4,868.05
7,545.78 6,549.74
lb-in

Tightening torques