Bosch GDX 18V-200 C (0.615.990.M46) - Инструкция по эксплуатации - Страница 11

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11

A light pressure on the on/off switch 

(13)

 results in a low ro-

tational speed. Increased pressure on the switch causes an
increase in speed.

Switching the "PowerLight" lamp on/off

Press the button 

(10)

 to 

activate

 the lamp 

(9)

. To switch off

the lamp 

(9)

, press the button 

(10)

 again.

Practical advice

u

Only apply the power tool to the screw/nut when the
tool is switched off.

 Rotating tool inserts can slip off.

The torque depends on the impact duration. The maximum
achieved torque results from the sum of all individual
torques achieved through impact. Maximum torque is
achieved after an impact duration of 6–10 seconds. After
this duration, the tightening torque is increased only minim-
ally.
The impact duration is to be determined for each required
tightening torque. The actually achieved tightening torque is
always to be checked with a torque wrench.

Screw applications with hard, spring-loaded or soft seats

When the achieved torques in an impact series are measured
during a test and transferred into a diagram, the result is the
curve of a torque characteristic. The height of the curve cor-

responds with the maximum reachable torque, and the
steepness indicates the duration in which this is achieved.

A torque gradient depends on the following factors:
– Strength properties of the screws/nuts
– 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 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.

Guide values for maximum screw tightening torques

Figures given in Nm; calculated from the tensional cross-section; utilization of the yield point: 90% (with friction coefficient
µ

total

 = 0.12). As a control measure, always check the tightening torque with a torque wrench.

Property Classes
according to
DIN 267

Standard Screws/Bolts

High-strength Bolts

3.6

4.6

5.6

4.8

6.6

5.8

6.8

6.9

8.8

10.9

12.9

M6

2.71

3.61

4.52

4.8

5.42

6.02

7.22

8.13

9.7

13.6

16.2

M8

6.57

8.7

11

11.6

13.1

14.6

17.5

19.7

23

33

39

M10

13

17.5

22

23

26

29

35

39

47

65

78

M12

22.6

30

37.6

40

45

50

60

67

80

113

135

M14

36

48

60

65

72

79

95

107

130

180

215

M16

55

73

92

98

110

122

147

165

196

275

330

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.

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.

Belt clip

You can use the belt clip 

(5)

 to hang the power tool on a belt,

for example. You then have both hands free and the power
tool is always at hand.

Recommendations for optimal handling of the battery

Protect the battery against moisture and water.
Only store the battery within a temperature range of -20 to
50 °C. Do not leave the battery in your car in the summer, for
example.

A significantly reduced operating time after charging indic-
ates that the battery has deteriorated and must be replaced.
Follow the instructions on correct disposal.

Maintenance and Service

Maintenance and Cleaning

u

Remove the battery from the power tool before carry-
ing out work on the power tool (e.g. maintenance,
changing tool, etc.). The battery should also be re-
moved for transport and storage.

 There is risk of injury

from unintentionally pressing the on/off switch.

u

To ensure safe and efficient operation, always keep
the power tool and the ventilation slots clean.

Bosch Power Tools

1 609 92A 546 | (05.06.2019)