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torques achieved through impact. Maximum torque is
achieved after an impact duration of 6–10 seconds. After
this duration, the tightening torque increases only minimally.
The impact duration is to be determined for each required
tightening torque. The tightening torque actually achieved
should always be checked with a torque wrench.
Screw applications with hard, spring-loaded or soft joints
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
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
M12
22.6
30
M14
36
48
M16
55
73
M18
75
101
M20
107
143
M22
145
190
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.
Control Via App
The power tool can be fitted with a Bluetooth® module which
enables wireless data transfer to certain mobile devices with
a Bluetooth® interface (e.g. smartphone, tablet).
In order to control the power tool via Bluetooth®, you will
need the "Bosch PRO360" app. Download the app from the
corresponding app store (Apple App Store, Google Play
Store).
Then select the "My Tools" sub-item in the app. The display
of your mobile terminal device will show you all subsequent
steps required to connect the power tool to the terminal
device.
The following functions will be available when a connection
has been established with the mobile device:
– Registration and personalisation
Bosch Power Tools
– 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.
– A spring-loaded joint is also a metal-to-metal screw ap-
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.
– A soft joint is a screw application of e.g. metal on wood
or a screw application that uses lead washers or fibre
washers as backing.
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
5.8
37.6
40
45
50
60
65
72
79
92
98
110
122
126
135
151
168
178
190
214
238
240
255
290
320
– Status check, output of warning messages
– General information and settings
– Management
– Setting the speed levels
– Setting the working modes
Secure Socket Release
When driving in or loosening screws and nuts, the socket
may become jammed. This can be considerably reduced if
the "Secure Socket Release" function is activated. The
power tool will briefly change the rotational direction of the
application tool to the opposite direction.
Activate the "Secure Socket Release" function via the Bosch
PRO360 app.
Maintenance and Service
Maintenance and Cleaning
Clean the air vents on your power tool regularly. The
u
motor's fan will draw the dust inside the housing and ex-
cessive accumulation of powdered metal may cause elec-
trical hazards.
Before carrying out any work on the power tool (e.g.
u
maintenance, tool change etc.), remove the battery
High-strength screws
6.8
6.9
8.8
10.9
60
67
80
113
95
107
130
180
147
165
196
275
202
227
270
380
286
320
385
540
385
430
510
715
1 609 92A 8SS | (22.05.2024)
English | 19
12.9
135
215
330
450
635
855
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