b&m-CONTACTSCREW eliminates ground cables As part of a development project for reflow soldering systems, the design engineering team at mechanical engineering company Kurtz Ersa wanted to pursue new approaches beyond additional ground cables and washers, to ensure reliable electrical ground bonding. Collobarating with baier & michels, member of the Würth Group, the b&m-CONTACTSCREW® was created – a metric screw that provides electrical connection during application.