In the automotive industry spacer sleeves and weld nuts are used to assemble elements of the carbody. In order to guarantee a smooth and reject-free production process, continuous control of these supply parts is necessary. The new magnetic-inductive sensors for detection of weld nuts made by TURCK are an economic and process safe solution. Spacer sleeves and weld nuts are used to assemble elements of the carbody shell like frames, U-shaped carriers and also seats or fuel tanks. If some nuts or sleeves are missing or may not have the required material quality, the automatic assembly process stops and the workpiece will be rejected. If these errors are not detected and rejects are produced, costs will increase considerably. Even complete carbody shells may not be further assembled if the stabilizing elements are not welded. In order to prevent the increase of production costs, it is necessary to control the supply of parts like weld nuts or spacer sleeves during the assembly process. The magnetic field sensor for weld nuts detects not only metal but it also replaces the location bolt. The sensor works on the basis of attenuation and thus detects ferromagnetic parts like sleeves, nuts and slices etc. It is mounted in a chrome-plated brass housing and IP67 protected. LEDs reliably indicate the current switching state (presence/absence of target objects and errors).