Hilti SI-AT-A22, Original Operating Instructions

Page: 17 / 352

English 11
5.6.2 “Tightening” operating mode
Note
The following information applies only to forward rotation of the impact
wrench (tightening). In reverse rotation, the impact wrench runs at the
highest torque setting.
In this operating mode a total of 30 torque settings are available. The setting
to be selected for a particular type of tightening application depends on the
diameter of the threaded fastener and the specified torque. The setting is
determined graphically on the basis of these data.
For the “Tightening” operating mode, the display shows the following:
The number to the right of the threaded-fastener symbol shows the selected
setting.
5.6.2.1 Determining the required setting for the “Bolting” operating
mode 5
1. Determine the specified torque and diameter for the bolted connection to
be tightened.
Note
For the sake of clarity, examples are shown in the diagram; the arrows
show the direction in which it should be read.
2. Start at the required torque on the vertical axis of the applicable diagram
and then move horizontally to the right until you reach the line for the
correct diameter.
3. Then move vertically downwards until you reach the horizontal axis and
read the setting at this point.
Note
The curves in the diagram were determined under specific conditions.
Since the conditions in everyday use constantly vary, the values
determined using the diagram should be used only as a guide. The
correct setting should therefore be determined as described below
by comparison with a conventional torque wrench.
4. Set the specified torque on a torque wrench and tighten a bolted
connection using the torque wrench.
5. Mark the exact position of the bolt or nut relative to the base material.
6. Release the bolt or nut again.
7. First select a slightly lower setting on the torque module than the one
indicated in the diagram.
Printed: 15.09.2017 | Doc-Nr: PUB / 5331629 / 000 / 02