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OBJ_BUCH-1066-001.book Page 21 Thursday, December 3, 2009 9:10 AM
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Reference Values for Maximum Screw/Bolt Tightening Torques
Calculated from the tensional cross-section; utilization of the yield point 90 % (with friction coefficient μtotal = 0.12). As a control measure, always check the tightening torque with a torque wrench.
Property Classes ac- Standard Screws/Bolts
cording to DIN 267
3.6
4.6
5.6
M6
2.71
3.61
M8
6.57
8.7
M 10
13
M 12
22.6
4.8
6.6
5.8
6.8
6.9
8.8
10.9
12.9
4.52
4.8
5.42
6.02
7.22
8.13
9.7
13.6
16.2
11
11.6
13.1
14.6
17.5
19.7
23
33
39
17.5
22
23
26
29
35
39
47
65
78
30
37.6
40
45
50
60
67
80
113
135
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
/3 of the screw length.
Maintenance and Service
Maintenance and Cleaning
f Before any work on the machine (e. g.,
maintenance, tool change, etc.) as well as
during transport and storage, set the rotational direction switch to the centre position. Unintentional actuation of the On/Off
switch can lead to injuries.
f 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 Bosch power tools.
If the machine should fail despite the care taken
in manufacturing and testing procedures, repair
should be carried out by an after-sales service
centre for Bosch power tools.
In all correspondence and spare parts order,
please always include the 10-digit article
number given on the type plate of the machine.
Bosch Power Tools
High-strength
Bolts
After-sales Service and Customer
Assistance
Our after-sales service responds to your questions concerning maintenance and repair of your
product as well as spare parts. Exploded views
and information on spare parts can also be
found under:
www.bosch-pt.com
Our customer service representatives can answer your questions concerning possible applications and adjustment of products and accessories.
Great Britain
Robert Bosch Ltd. (B.S.C.)
P.O. Box 98
Broadwater Park
North Orbital Road
Denham
Uxbridge
UB 9 5HJ
Tel. Service: +44 (0844) 736 0109
Fax: +44 (0844) 736 0146
E-Mail: [email protected]
Ireland
Origo Ltd.
Unit 23 Magna Drive
Magna Business Park
City West
Dublin 24
Tel. Service: +353 (01) 4 66 67 00
Fax: +353 (01) 4 66 68 88
2 609 140 699 | (3.12.09)