100 Fastening technology EJOT ALtracs® Xt – Thread forming in light alloys without tradeoffs By M. Eng. Christoph Sinner, Product Manager ALtracs®, EJOT SE & Co. KG In modern assembly lines cost saving and component optimization are a decisive competitive factor. By omitting production steps such as drilling, thread-cutting, cleaning as well as optimization in the field of tooling, ware- housing and shorter cycle times, the total costs of a screw joint can be reduced by up to 30 percent with the use of a thread-forming screw. Due to these economic advantages, “thread forming in light alloys” is gaining importance, especially in demanding conditions. So far in the market, there are two different established screw concepts, which differ significantly in key points: One type of screw aims to have an exceptionally low installation torque (the torque required to achieve head contact) in a given connection while still ensuring secure fastening. This is achieved by not having a completely circular screw thread. As a result, the contact area with the female thread is reduced during installation, minimizing overall friction. However, the downside of this concept is evident: The reduced bearing ratio of the thread compromises the mechanical stability and achievable clamp load for the Images: © EJOT “Progressive Forming Profile” at the tip of the ALtracs® Xt
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