Bosch GDS 18V-350 Professional Notice Originale page 10

10 | English
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 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
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
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.
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.
Temperature-dependent overload protection
In normal conditions of use, the power tool cannot be over-
loaded. In the event of overloading or exceeding of the per-
mitted rechargeable battery temperature, the power tool
automatically shuts off the electronics.
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
1 609 92A 9DZ | (07.05.2024)
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.
5.6 4.8 6.6 5.8
11 11.6 13.1 14.6
22 23 26 29
37.6 40 45 50
60 65 72 79
92 98 110 122
126 135 151 168
from the power tool. There is risk of injury from uninten-
tionally pressing the on/off switch.
To ensure safe and efficient operation, always keep
u
the power tool and the 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. You can find explosion drawings and information on
spare parts at: www.bosch-pt.com
The Bosch product use advice team will be happy to help you
with any questions about our products and their accessor-
ies.
In all correspondence and spare parts orders, please always
include the 10‑digit article number given on the nameplate
of the product.
Malaysia
Robert Bosch Sdn. Bhd.(220975-V) PT/SMY
No. 8A, Jalan 13/6
46200 Petaling Jaya
Selangor
Tel.: (03) 79663194
Toll-Free: 1800 880188
Fax: (03) 79583838
High-strength screws
6.8 6.9 8.8 10.9
17.5 19.7 23 33
35 39 47 65
60 67 80 113
95 107 130 180
147 165 196 275
202 227 270 380
Bosch Power Tools
12.9
39
78
135
215
330
450