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 TORQUE WRENCH 1/4" 1-6Nm 

 OM  0791 

 TORQUE WRENCH 1/4" 1-6Nm 

 OM  0794 

Before returning this product for any reason 
(installation problem, instructions for use, 
breakdown, manufacturing problem...), please 
contact us.

Contact : 
You can reach us by mail  [email protected] or by 
phone +33(0)4 79 72 69 18 or go directly to our 
website clas.com

If you have changed your mind regarding your 
purchase, please return this product before you 
attempt to install it.

WARNING

WARNING

SELECTION GUIDE

FONCTIONNEMENT

Before using this torque wrench, please read these 
instructions carefully. If you have any questions, 
please contact the CLAS service department to 
avoid safety accidents and damage to the tool 
caused by improper use.

Select the appropriate torque wrench and socket 
based on the torque value required by the bolt 
or nut to be required by the bolt or nut to be 
tightened.

1 - Main pipe
2 - Main scale
3 - Secondary scale

4 - Lock
5 - Handle

1 - Set the torque value 
2 - Pull the locking ring back to unlock the wrench, 
and turn the nut to adjust the torque at the same 
time.

2  3 

4

5

3 - Turn the handle to set the appropriate torque 
value, then release the lock. (The fi gure below 
shows the method of setting to 66Nm).

3.1 - The initial state of the handle is 10 Nm. 
3.2 -  Pull the lock backwards to put the handle in 

the unlocked state. Do not release the the 
lock. 

3.3 -  To adjust the torque, simply turn the handle 

clockwise to increase the torque and 
anticlockwise to decrease the torque. First 
turn the handle clockwise until you reach 60 
Nm. The "0" on the secondary scale must be 
aligned with the central mark on the main 
scale. 

3.4 -  Then turn the handle again to align the "6" on 

the secondary scale with the center mark on 
the main scale. Release the lock. The handle 
is now locked with a torque value of 66 Nm. 

3.5 -  After use, if the key is not used for a long 

period of time, pull the lock backwards to 
unlock it. backwards to unlock the key and 
return it to its initial state (10 Nm). 

3.6 -  

The screw can be tightened with a fi xed 
torque by choosing an appropriate socket.

3.7 -  During the tightening process, when the set 

torque is reached, the torque wrench emits a 
"click". From this moment on, stop applying 
force immediately. This sound indicates that 

1 - Clé dynamométrique
2 - Douille
3 - Écrou

the torque has reached the set value. During 
the tightening process, the torque must be 
applied evenly, without applying any inertial 
force. When using a small torque, the "click" 
will not be evident. An obvious slip will 
indicate that the torque has also reached 
the set torque value. (The "click" sound of 
the small torque is not obvious because the 
spring is under a small compression).

PRECAUTIONS OF USE

1.1 -  Before using the torque wrench, fi rst check 

that you have selected the correct torque 
wrench for the tightening task. 

1.2  -   After selecting the appropriate torque wrench, 

check that the torque value corresponds to 
that expected. 

1.3 -  In order to guarantee the accuracy of the 

torque wrench, it is necessary to recalibrate 
it after one year or 5000 uses. 

1.4 -  Please read the instructions carefully before 

using the torque wrench. 

1.5 -  If the torque wrench is not used for a long 

period of time, it is necessary to set torque 
wrench to the minimum torque value, in order 
to avoid long-term compression of the spring. 
of the spring. This could aff ect the accuracy 
of the torque wrench. 

1.6 -  

Do not use the torque wrench to strike 
objects.

CONVERSION TABLE

COMMON TORQUEMETER

lb-in

lb-ft

Nm

kg-cm

kg-m

1 lb-in

1

0,083

0,113

1,1519

0,0115

1 lb-ft

12

1

1,356

13,824

0,1382

1 Nm

8,853

0,738

1

10,2

0,102

1 kg-cm

0,8679

0,0723

0,0981

1

0,01

1 kg-m

86,8100

7,234

9,804

100

1


Bolt diameter

Grade of strength

4,6

6,8

8,8

10,9

12,9

Minimum tensile 

strength

392MPa

588MPa

784MPa

941MPa

1176MPa

M4

4

4

4

5

5

M5

5

5

6

8,5

10

M6

6

6

8

14

17

M8

21

21

25

35

41

M10

41

41

49

69

83

M12

72

72

86

120

145

M14

80

98

137

165

225

M16

98

137

206

247

353

M18

137

206

284

341

480

M20

206

296

402

569

480

M22

225

333

539

765

911

M24

314

470

686

981

1176

M27

441

637

1029

1472

1764

M30

588

882

1225

1962

2352

M33

735

1127

1470

2060

2450

M36

980

1470

1764

2453

3940

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