Bosch GDS 18 E Professional Notice Originale page 17

OBJ_BUCH-544-002.book Page 17 Tuesday, February 8, 2011 1:09 PM
The following application cases result accord-
ingly:
– A hard seat is given for metal-to-metal screw
applications with the use of washers. After a
relatively short impact duration, the maxi-
mum torque is reached (steep characteristic
curve). Unnecessary long impact duration
only causes damage to the machine.
– A spring-loaded seat is given for metal-to-
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.
Reference Values for Maximum Screw/Bolt Tightening Torques
Calculated from the tensional cross-section; utilization of the yield point 90 % (with friction coeffi-
cient μ = 0.12). As a control measure, always check the tightening torque with a torque wrench.
total
Property Classes Standard Screws/Bolts
according to DIN 267
M6 2.71
M8 6.57
M10
M12 22.6
M14
M16
M18
M20 107
Tips
Torque rods have shanks with precisely calibrat-
ed, reduced diameters. Thus, they act torque-
limiting. A torque rod is placed between the im-
pact wrench and the bit.
Rule of thumb for the application: Core diame-
ter of the screw/bolt = effective diameter of the
torque rod. The impact duration is to be deter-
mined through practical testing.
The thumbwheel 6 must be set to max.
Bosch Power Tools
– 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 im-
pact duration is required.
3.6 4.6 5.6 4.8
3.61 4.52 4.8
8.7 11 11.6
13 17.5 22 23
30 37.6 40
36 48 60 65
55 73 92 98
75 101 126 135
143 178 190
For hanging up, a suspension hook 3 is mounted
at the machine's centre of gravity.
At temperatures below the freezing point, run
the machine for approx. 3 minutes at no-load to
improve its lubricating capacity.
e. g., metal on wood or when using lead
washers or fibre 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
English | 17
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
1 609 929 Y31 | (8.2.11)