FLENDER B3 A Series - Bolt Connection Classes; Information on Tightening Fastening Bolts

Note
Replacing bolts
Replace any bolts that are no longer 󹪝t for use by bolts of the same type and strength class.
Mating threads
The mating threads must have the following properties:
• Made of steel or cast iron
• Dry, cut threads
Note
Using a lubricant
As a rule, lubricants may not be used, because this can result in the bolt connection becoming
overloaded.
5.10.2 Bolt connection classes
In order to a󹪟x fastening bolts, note the information in the following table:
Table 5-4 Information on tightening fastening bolts
Mounting Bolt connection
class
Scatter of the tor‐
que emitted on
the tool
Tightening procedure
Gear unit
Motor
Brake
Torque arm
C ± 5 % to ± 10 %
• Hydraulic tightening with me‐
chanical screwdriver
• Torque-controlled tightening
with a torque wrench or a signal-
emitting torque wrench
• Tightening with a precision me‐
chanical screwdriver with dynam‐
ic torque measurement
D ± 10 % to ± 20 %
• Torque-controlled tightening
with mechanical screwdriver
Protection cover
Sun shield
E ± 20 % to ± 50 %
• Tightening with pulse screwdriv‐
er or impact wrench, without ad‐
justment checking device
• Tightening by hand, using a
wrench without torque measur‐
ing device
Assembly
5.10 Tightening procedure
Assembly and operating instructions A5051en
Edition 06/2020 91