Columbus electric wheel nut runner is primarily intended to be used for loosening and tightening of the wheel nuts on heavy vehicles - trucks, buses, trailers, construction equipment etc. Columbus nutrunners can of course also be used for other tasks where location and space allows.

Columbus nutrunner has been manufactured by Columbusmaskiner AB since 1950 's.

Columbus wheel nutrunners are very comfortable and easy to work with. All controls are easily accessible placed on both shafts of the machine. In comparison to a conventional air impact wrench, Columbus electric wheel nutrunner is very ergonomic, quiet and superior in force. They are able to remove even the tightest nut. They give no vibrations that can damage your hands or other body parts. You automatically get a natural working position when working with a Columbus nutrunner.

Columbus nutrunner has a rotating flywheel, releases its kinetic energy in the form of a blow to the wheel nut. This allows the wrench to work with very great force, compared with conventional air nutrunners. A spring system makes the machine body almost weightless and it requires minimal force when leveling.

The machine socket tube is provided with a one inch square drive for power sockets.

Spare parts, power sockets and adapters are always in stock for fastest delivery.

Columbusmaskiner manufactures three different models of the Columbus electric nutrunner.

Nutrunner - Columbus WNR-STD

Mutterdragare MD STD Columbus

Columbus WNR-STD is the standard model. All functions are transferred here by mechanical means.

The direction of rotation of the flywheel is changed with a combined three position switch. The drive belts are tightened with the right handle so that the flywheel rotates.
The left button (impact button)
couples the flywheel to the wrench holder tube. The flywheel’s kinetic energy is transmitted to wrench holder tube in the form of an impact.
The working height is adjusted with the left handle.



Columbus nutrunners are of course developed and designed in consultation with professionals within this branch.
Our research shows that those who choose WNR-EC and WNR-EC2 cannot imagine using any other type of nutrunner for this type of job - thanks to the good performance and ergonomics of the above models.


Tightening torque for well-lubricated screw joints:

Run-up phase  370 Nm, 37 kpm (transport of nut into position towards rim)
First impact   520 Nm, 52 kpm
Second impact 640 Nm, 64 kpm 
Third impact   710 Nm, 71 kpm (NOTE: For each subsequent impact, the tightening torque increases in the screw) 
Max. tightening torque  3000 Nm, 300 kpm approximately 

The friction between the screw and the nut and its contact surface is crucial for how close to the approximate tightening torques mentioned above you come.
It is therefore very important that the screw joint is well lubricated and cleaned when tightening.
The Columbus electric nutrunner have no built-in function that provides an exact tightening torque.
If you want to achieve an exact tightening torque, a torque wrench should be used.

pdfCE declaration


Weight 60 kg
Lenght 1300 mm
With 600 mm
Height 1000 mm
Motor 1,5 Hp (1,1 kW), 230/ 400 V, 3-phase, 50/60 Hz, electrical protection class – IP54
Working height Max. 855 mm for WNR-STD & WNR-EC
Working height Min. 345 mm for WNR-STD & WNR-EC 
Working height Max.  855 mm for WNR-EC2
Working height Min.  365 mm for WNR-EC2 
We reserve the right to make design changes without notice.

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