Bosch GDS 24 Notice Originale page 13
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Voir aussi pour GDS 24:
- Notice originale (175 pages) ,
- Notice originale (111 pages) ,
- Notice originale (73 pages)
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– 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 is a metal-to-metal screw application which
uses 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 also a metal-to-metal screw ap-
plication but uses spring washers, disc springs, studs or
screws/nuts with conical seats. It is also called a spring-
loaded seat when extensions are used.
– A soft seat is a screw application of e.g. metal on wood or
a screw application that uses lead washers or fibre wash-
ers as backing.
For a spring-loaded seat as well as for a soft seat, the max-
imum tightening torque is lower than for a hard seat. Also, a
clearly longer impact duration is required.
Determining the impact duration
The diagrams (examples) show the tightening torque [Nm]
depending on the impact duration [s]:
❶ for hard seat
❷ for soft seat.
The values provided are average values and differ depending
on the application. As a control measure, always check the
tightening torque with a torque wrench.
Diagram for GDS 24
[Nm]
Guide values for maximum screw tightening torques
Figures given in Nm; calculated from the tensional cross-section; utilisation of the yield point: 90% (with friction coefficient
µ
= 0.12). As a control measure, always check the tightening torque with a torque wrench.
total
Property classes
Standard screws/bolts
according to DIN
3.6
4.6
267
M8
6.57
8.7
M10
13
17.5
M12
22.6
30
Bosch Power Tools
The maximum torque is achieved:
– After an impact duration of approx. 10 seconds for a hard
seat
– After an impact duration of approx. 22 seconds for a soft
seat
Diagram for GDS 30
[Nm]
The maximum torque is achieved:
– After an impact duration of approx. 6 seconds for a hard
seat
– After an impact duration of approx. 26 seconds for a soft
seat
Guide values for maximum screw/bolt tightening torques of
commercially available screws/bolts can be found in the fol-
lowing table.
1
2
[s]
5.6
4.8
6.6
5.8
11
11.6
13.1
14.6
22
23
26
29
37.6
40
45
50
High-strength bolts
6.8
6.9
8.8
10.9
17.5
19.7
23
33
35
39
47
65
60
67
80
113
1 609 92A 4R3 | (01.04.2019)
English | 13
1
2
[s]
12.9
39
78
135
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Table des Matières
