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Tunnel boring machines  
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IMO designs and manufactures high load Triple Row Roller Slewing Rings for tunnel boring machines. A multistage sealing system can be integrated if required.

This Triple Row Slewing Ring contains brass cages and three rows of rollers in the main raceway.


Slewing Rings for cutting heads present large design challenges due to the heavy loading, adverse environmental conditions and life requirements.

A Triple Row Roller Slewing Ring of 4,500 mm (177 in) OD with external toothing for a tunnel boring machine. The main raceway has two rows of rollers (80 mm – approx. 3 in diameter) to carry the heavy loading created during tunnelling.


The erector uses a Cross Roller Slewing Ring for lifting and positioning the concrete lining segments (Tubbing) which are used for strengthening the tunnel walls.

Raceway diameter 4,500 mm
Outside diameter 4,700 mm
Roller diameter 40 mm
Double lip seals with primary labyrinth


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