Bosch GDR 12V-110 - Инструкция по эксплуатации - Страница 16

16

 | English 

1 609 92A 29D | (20.7.16)

Bosch Power Tools

after an impact duration of 6 – 10 seconds. After this dura-
tion, the tightening torque is increased only minimally.

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 Seat

A test in which the achieved torques in an impact series are 
measured and transferred to a diagram will produce the curve 
of a torque characteristic. The height of the curve corre-
sponds with the maximum reachable torque, and the steep-
ness 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 given for metal-to-metal screw applications 

with the use of washers. After a relatively short impact du-
ration, the maximum torque is reached (steep characteris-
tic curve). Unnecessary long impact duration only causes 
damage to the machine.

– A 

spring-loaded seat

 is given for metal-to-metal screw ap-

plications, 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 washers or fibre washers as back-
ing.

For a spring-loaded seat as well as for a soft seat, the maxi-
mum tightening torque is lower than for a hard seat. Also, a 
clearly longer impact duration is required.

Reference Values for Maximum Screw/Bolt Tightening Torques

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.

Tips

Before screwing larger, longer screws into hard materials, it is 
advisable to predrill a pilot hole with the core diameter of the 
thread to approx. 

2

/

3

 of the screw length.

Note: 

Pay attention that no metal particles enter the power 

tool.

Belt Clip (see figure E)

With the belt clip 

17

, the machine can be hung onto a belt. The 

user has both hands free and the machine is always at hand.

Colour clip (see figure F)

You can use the colour clip 

18

 to individually label the power 

tool.

Recommendations for Optimal Handling of the Battery

Protect the battery against moisture and water.

Store the battery only within a temperature range between 
– 20 ° C and 50 ° C. As an example, do not leave the battery in 
the car in summer.

Occasionally clean the venting slots of the battery using a soft, 
clean and dry brush.

A significantly reduced working period after charging indi-
cates that the battery is used and must be replaced.

Observe the notes for disposal.

Maintenance and Service

Maintenance and Cleaning



Before any work on the machine itself (e. g. mainte-
nance, tool change, etc.) as well as during transport 
and storage, remove the battery from the power tool. 

There is danger of injury when unintentionally actuating 
the On/Off switch.



For safe and proper working, always keep the machine 
and ventilation slots clean.

After-sales Service and Application Service

Our after-sales service responds to your questions concern-
ing maintenance and repair of your product as well as spare 
parts. Exploded views and information on spare parts can al-
so be found under:

www.bosch-pt.com

Bosch’s application service team will gladly answer questions 
concerning our products and their accessories.

In all correspondence and spare parts orders, please always 
include the 10-digit article number given on the nameplate of 
the product.

Property Classes accord-
ing 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

M 6

2.71

3.61

4.52

4.8

5.42

6.02

7.22

8.13

9.7

13.6

16.2

M 8

6.57

8.7

11

11.6

13.1

14.6

17.5

19.7

23

33

39

M 10

13

17.5

22

23

26

29

35

39

47

65

78

M 12

22.6

30

37.6

40

45

50

60

67

80

113

135

M 14

36

48

60

65

72

79

95

107

130

180

215

M 16

55

73

92

98

110

122

147

165

196

275

330

OBJ_BUCH-2928-001.book  Page 16  Wednesday, July 20, 2016  1:58 PM