Bosch GDR 9,6 V Original Operating Instructions page 11

OBJ_BUCH-608-001.book Page 11 Thursday, December 6, 2007 4:35 PM
A torque gradient depends on the following fac-
tors:
– 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 con-
nection
The following application cases result according-
ly:
– A hard seat is given for metal-to-metal screw
applications with the use of 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.
Reference Values for Maximum Screw/Bolt Tightening Torques
Calculated from the tensional cross-section; utilization 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 ac- Standard Screws/Bolts
cording to DIN 267
M 6
M 8
M 10
M 12
M 14
M 16
M 18
M 20
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
/ of the screw length.
3
Belt Clip (see figure D)
With the belt clip 4, the machine can be hung on-
to a belt. The user has both hands free and the
machine is always at hand.
The belt clip 4 can be attached and screwed to ei-
ther side of the machine.
Bosch Power Tools
– A spring-loaded seat is given for metal-to-
– A soft seat is given for screw applications,
For a spring-loaded seat as well as for a soft seat,
the maximum tightening torque is lower than for
a hard seat. Also, a clearly longer impact duration
is required.
3.6 4.6 5.6 4.8
2.71 3.61 4.52 4.8
6.57 8.7 11 11.6
13 17.5 22 23
22.6 30 37.6 40
36 48 60 65
55 73 92 98
75 101 126 135
107 143 178 190
The belt clip 4 will automatically draw out when
pressing both release buttons. To dismount the
belt clip 4, remove the complete unit by unscrew-
ing the fastening screw.
Always tighten the fastening screw after mount-
ing the belt clip 4.
metal screw applications, however with the
use of spring washers, disc springs, studs or
screws/nuts with conical seat as well as when
using extensions.
e. g., metal on wood or when using lead wash-
ers or fiber washers as backing.
6.6 5.8 6.8 6.9
5.42 6.02 7.22 8.13
13.1 14.6 17.5 19.7
26 29 35 39
45 50 60 67
72 79 95 107
110 122 147 165
151 168 202 227
214 238 286 320
1 609 929 M69 | (6.12.07)
English | 11
High-strength
Bolts
8.8 10.9 12.9
9.7 13.6 16.2
23 33 39
47 65 78
80 113 135
130 180 215
196 275 330
270 380 450
385 540 635