Wera BiTorsion System
The punishing stresses that can damage or destroy screwdriving system components (i.e. bits) represent a problem that Nature solves in a very simple way. A tree, when it is subjected to a gust of wind, is initially protected by a loss of leaves, or the swaying of the branches. If the wind grows to the power of a storm, then the trunk of the tree will start to give further, protecting itself from the tremendous stress. As a result, these multiple stages of flexibility allow the tree to withstand the huge force of a storm, without damage to the system.
To improve screwdriver bit service life, Wera has taken its cue from nature: Through the gradual yielding of both the screwdriver bit and the adapter, the service life of the entire system is dramatically increased.
The new BiTorsion® Bit now goes one step further: By means of a specific tempering process, the hardness of the bits is reduced only in the torsion zone. This softer zone absorbs energy and therefore dissipates peak loads from the tip, into the torsion zone.
Wera has also engineered the 75 mm (3″) length of the adaptor to help cushion peak loads, by acting as a precision torsion spring. The spring curve is designed so that brief, lower torque peaks (phase 1) are transmitted directly from the bit to the torsion spring in the adaptor, where they are absorbed. Under higher, more intense torque peaks ( phase 2 ), the adaptor “locks up” which activates the torsion zone of the bit itself.
Wera’s new BiTorsion® adaptors and bits can also function independently: the adaptors will help „conventional” bits to last longer, and BiTorsion® bits will perform better than conventional bits when used in a “conventional” adaptor. However, the optimum effect of the precision engineered spring curves is only achieved, when both the BiTorsion® adaptor and bit are combined.
The BiTorsion® – components can be easily identified by the coloured band, the Wera symbol for increased service life.
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