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12 | English
– Type of backing (washer, disc spring, 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 joint 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.
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
according to DIN
3.6
4.6
267
M6
2.71
3.61
M8
6.57
8.7
M10
13
17.5
M12
22.6
30
M14
36
48
M16
55
73
M18
75
101
Tips
Before screwing larger, longer screws into hard materials, it
is advisable to pre-drill a pilot hole with the core diameter of
the thread to approx. 2/3 of the screw length.
Note: Ensure that no metal particles enter the power tool.
The user interface (8), see figures D–E, is used to preselect the speed and working mode.
Speed preselection
With the speed preselection button (15), you can preselect
the required speed in two stages.
Keep pressing the speed preselection button (15) until the
required setting is shown in the speed indicator (16). The
selected setting will be saved.
The required speed depends on the material and the work-
ing conditions; it can be ascertained through practical tests.
The information in the table below describes the recommen-
ded values.
Basic speed setting at level
1
[min
Number of speed settings
2 (GDR 18V-215)
Predefined working mode
Function
ABR (GDX 18V-285)
The automatic shutdown (ABR) is a function for releasing
nuts: The power tool automatically shuts down when the bolt
1 609 92A 9N7 | (30.07.2024)
– A spring-loaded joint is also a metal-to-metal screw ap-
– A soft joint is a screw application of e.g. metal on wood
For a spring-loaded joint as well as for a soft joint, the max-
imum tightening torque is lower than for a hard joint. Also, a
clearly longer impact duration is required.
5.6
4.8
6.6
4.52
4.8
5.42
11
11.6
13.1
22
23
26
37.6
40
45
60
65
72
92
98
110
126
135
151
After working at a low speed for an extended period, you
should operate the power tool at the maximum speed for ap-
proximately three minutes without load to cool it down.
User interface
Number of speed settings
2 (GDX 18V-285)
You can use the button for speed preselection (15) to
preselect the required speed, even during operation.
Selecting the working mode
The power tool has two preset working modes per model:
GDR 18V-215: Auto Slow-down (wood) and Auto Shut-
2
off (metal)
–1
–1
GDX 18V-285: Automatic shutdown (ABR) and Auto
]
[min
]
Shut-off (metal)
To switch between the two working modes, press the func-
0–2100
0–3300
tion button (20).
plication but uses spring washers, disc springs, studs or
screws/nuts with conical joints. It is also called a spring-
loaded joint when extensions are used.
or a screw application that uses lead washers or fibre
washers as backing.
High-strength screws
5.8
6.8
6.9
8.8
6.02
7.22
8.13
9.7
14.6
17.5
19.7
23
29
35
39
47
50
60
67
80
79
95
107
130
122
147
165
196
168
202
227
270
Basic speed setting at level
1
[min
Recommended application
Screw size: M12
10.9
12.9
13.6
16.2
33
39
65
78
113
135
180
215
275
330
380
450
2
–1
–1
]
[min
]
0–2000
0–2800
Bosch Power Tools
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