Wurth WR-DC PCB Mount DC Power Jacks - 6.4 mm Barrel Diameter. PCB mount DC power jacks or barrel connectors with a 6.4mm barrel diameter. These PCB mount DC power jacks have an internal normally closed single switch and internal pin diameters of 2.05 mm and 2.55 mm. The stamped contacts of these DC power jacks are gold plated and the housings are made from black UL94-V0 PA66. Centre Pin Dimensions. ; 1224883 1224883:2.5mm. ; 1631840 1631840:2.5mm. ; 1224879 1224879:2.1mm. ; 1631836 1631836:2.1mm