For decades, it has proven itself on the market as a reliable and cost-effective standard series of metal bellows couplings: the KM metal bellows coupling from JAKOB Antriebstechnik. Like all metal bellows couplings, it is rigid in the direction of rotation, but flexible in axial, angular and radial directions. Despite the similarities, metal bellows couplings can differ greatly from one another. The technical differences lie, for example, in the choice of bellows or the type of connection between bellows and hub or bellows and shaft. JAKOB only uses thin-walled, multi-layer bellows made from certified stainless steel sheets. This ensures high torsional stiffness, which guarantees precise positioning and concentricity even under demanding conditions and guarantees absolutely backlash-free torque transmission between the input and output shafts. The multi-layer design of the bellows also makes it possible to absorb large shaft displacements with low restoring forces. This means increased reliability, operational safety and service life.


The KM clamping hub is equipped with the innovative Easy-Clamp system, which makes it easy to slide on with sufficient fitting clearance. The preload force required for torque transmission is ensured by a single, radially accessible screw per hub. This simple and reliable connection enables uncomplicated installation, even in tight spaces, in just a few simple steps. In order to achieve a low mass moment of inertia, the hubs are made of high-strength aluminum.


The bellows and hub are connected using the backlash-free flare press-fit method. In contrast to adhesive connections, this joining method is indefinitely durable under critical operating conditions (-40 °C to +200 °C, chemicals, etc.) and can safely transfer the transmission torque of each bellows position to the hub.


Metal bellows couplings from the KM series are available with nominal torques from 0.4 (MKM) to 1300 Nm (KM).