ABB Feather Duster, Product Manual

Page: 81 / 150

6 Reference information
6.3. Bolt, screws, tightening torques
79 3HAW050027150 Revision: C
©
Co
py
rig
h
t 201
3-
101
6 ABB. All righ
ts reser
v
ed.
6.3. Bolt, screws, tightening torques
Bolt and screws
Before tightening any screw, observe the following:
• Determine whether a standard tightening torque or special torque is to be applied.
The standard torques are specified in the following tables. Any special torques are
specified in the repair, maintenance or installation procedure descriptions. Any
special torque specified overrides the standard torque!
•
Use the correct tightening torque for each type of screw joint.
• Only use correctly calibrated torque keys.
•
Always tighten the joint by hand , and never use pneumatic tools.
• Use the correct tightening technique , tighten the screw in a slow, flowing motion.
•
Maximum allowed total deviation from the specified value is 10% !
NOTE!
Unless indicated otherwise, the bolts used on (or provided with) the Feather Duster are of
class 8.8.
NOTE!
Unless indicated otherwise, all bolts must be clean of oil or grease and tightened with a mild
thread-locker such as Loctite 243.
Standard tightening torques
The following table specifies the recommended standard tightening torques for hex screws
and socket head hex screws :
The following table specifies the recommended standard tightening torque for water and air
connectors when one or both connectors are made of brass:
Screw thread size M5 M6 M8 M10 M12
Tightening torque
CLASS 8.8
5.5 N.m 9.5 N.m 23 N.m 46 N.m 79 N.m
Tightening torque
CLASS 10.9
8.1 N.m 14 N.m 34 N.m 67 N.m 116 N.m
Tightening torque
CLASS 12.9
9.5 N.m 16.4 N.m 40 N.m 79 N.m 136 N.m
Dimension Tightening torque
Nm - Nominal Tightening torque
Nm - Minimal Tightening torque
Nm - Maximum
1/8 12 N.m 8 N.m 15 N.m
1/4 15 N.m 10 N.m 20 N.m
3/8 20 N.m 15 N.m 25 N.m
1/2 40 N.m 30 N.m 50 N.m
3/4 70 N.m 55 N.m 90 N.m