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OBJ_BUCH-2879-001.book Page 19 Friday, June 3, 2016 12:56 PM
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 applica-
tions 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
measure, always check the tightening torque with a torque wrench.
Property Classes
Standard Screws/Bolts
according to DIN 267
3.6
M 6
2.71
M 8
6.57
M 10
13
M 12
22.6
M 14
36
M 16
55
Tips
Before screwing larger, longer screws into hard materials, it is
advisable to predrill a pilot hole with the core diameter of the
2
thread to approx.
/
of the screw length.
3
Note: Pay attention that no metal particles enter the power
tool.
Belt Clip
With the belt clip 3, the machine can be hung onto a belt. The
user has both hands free and the machine is always at hand.
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 bat-
tery 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.
• 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.
• A soft seat is given for screw applications, e. g., metal
on wood or when using lead washers or fibre washers as
backing.
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.
4.6
5.6
4.8
6.6
3.61
4.52
4.8
5.42
8.7
11
11.6
13.1
17.5
22
23
26
30
37.6
40
45
48
60
65
72
73
92
98
110
Before any work on the power tool, remove
the battery.
For safe and proper working, always keep the
machine and ventilation slots clean.
When the battery is no longer operative, please refer to an
authorised after-sales service agent for Würth power tools.
If the machine should fail despite the care taken in manufac-
turing and testing procedures, repair should be carried out by
a Würth master-Service.
In all correspondence and spare parts orders, please always
include the article number given on the type plate of the
machine.
The current spare parts list for this power tool can be viewed
on the internet at http://www.wuerth.com/partsmanager or
be requested from your next Würth branch office.
= 0.12). As a control
total
High-strength Bolts
5.8
6.8
6.9
8.8
6.02
7.22
8.13
9.7
14.6
17.5
19.7
23
29
35
39
47
50
60
67
80
79
95
107
130
122
147
165
196
Maintenance and Cleaning
10.9
12.9
13.6
16.2
33
39
65
78
113
135
180
215
275
330
19
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