1 609 929 M75 | (12.11.07) Bosch Power Tools
8 | English
The following application cases result according-
ly:
–A hard seat is given for metal-to-metal screw
applications with the use of washers. After a
relatively short impact duration, the maximum
torque is reached (steep characteristic
curve). Unnecessary long impact duration
only causes damage to the machine.
–A spring-loaded seat is given for metal-to-
metal screw applications, however with the
use of spring washers, disc springs, studs or
screws/nuts with conical seat as well as when
using extensions.
–A soft seat is given for screw applications,
e. g., metal on wood or when using lead wash-
ers or fiber washers as backing.
For a spring-loaded seat as well as for a soft seat,
the maximum tightening torque is lower than for
a hard seat. Also, a clearly longer impact duration
is required.
Determining the Impact Duration
The diagrams (examples) indicate that the tight-
ening torque [Nm] depends on the impact dura-
tion [s]:
n For a hard seat
o For a soft seat.
The data are mean values and vary depending on
the application. As a control measure, always
check the tightening torque with a torque
wrench.
Diagram for GDS 24
The highest torque is achieved:
– for a hard seat after approx. 10 seconds of im-
pact
– for a soft seat after approx. 22 seconds of im-
pact
Diagram for GDS 30
The highest torque is achieved:
– for a hard seat after approx. 6 seconds of im-
pact
– for a soft seat after approx. 26 seconds of im-
pact
For reference values for the maximum tightening
torques of commercially available screws/bolts,
see the following table.
[Nm]
[s]
1
2
[Nm]
[s]
1
2
OBJ_BUCH-550-001.book Page 8 Monday, November 12, 2007 4:54 PM
To Next Page
Loading...
