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Usage advice
Apply the power tool to the screw/nut only when it is switched off. Rotating tool inserts can
slip off the workpiece if applied when in motion.
The maximum torque is achieved after the impact duration of 6–10 seconds. After this
duration, the tightening torque is increased only minimally. The impact duration is to be
determined for each required tightening. The resultant tightening is always to be checked
with a torque wrench. When working with an application tool, pay attention that the
application tool is firmly seated on the tool holder.
Screw applications with a hard, spring-loaded or soft seat
The required torque will depend on the following factors:
•
Strength properties of the screws/nuts
•
Type of backing (washer, disc spring and seal)
•
Strength properties of the material being screwed/bolted together
•
Lubrication conditions at the screw/bolt connection
The following application cases result accordingly:
•
A hard seat refers to metal-to-metal screw applications with the use of washers.
After a relatively short impact duration, the maximum torque is reached.
Unnecessary long impact durations will only cause damage to the machine.
•
A spring-loaded seat refers to metal-to-metal screw applications with the use of
spring washers, disc springs, studs, or screws/nuts with conical seats as well as
when using extensions. The maximum tightening torque is lower than for a hard
seat, and a longer impact duration is required.
•
A soft seat refers to screw applications such as metal on wood, or when using
lead/fibre washers as backing. The maximum tightening torque is lower than for a
hard seat, and a longer impact duration is required.
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