Extensive field tests by the renowned specialist agricultural journal, “Top Agrar”, have very clearly come out in favour of the coupling ball bushes from GKN Walterscheid. “Cheap coupling balls look just like branded products and can cost less than half but this false economy can be highly dangerous”, concludes the report in July 2014. Cheap coupling balls often have a very high carbon content making them harder but also more brittle; this makes them highly susceptible to fracture when subjected to shock loads.
The material used for the ball bushes from GKN Walterscheid has a low carbon content on the inside. In addition, however, it contains significant quantities of chromium and manganese thus ensuring the alloy is of a considerably higher quality, compared to other products.
In contrast to the material on the inside, a relatively high carbon content is desirable for the outside of the ball bushes. A surface that is enriched with carbon in an elaborate heat treatment process is hard and correspondingly resistant. The ball bushes from GKN Walterscheid are characterised by precisely this combination of maximum wear resistance and a tough core. Ball bushes – and also ball guide cones – from GKN Walterscheid are thus extremely wear-resistant and therefore permit long-term, trouble-free operation.