For mating 3.81 mm pitch BCZ plug Socket Connectors see stock number ; 739-3857 739-3857 for 180° and ; 739-3920 739-3920 for 90° typical. SC-SMT Headers - 180° 3.2mm Pin Length. These Weidmuller SC-SMT series of 180°, Through Hole Shrouded Headers have 3.2 mm solder pin lengths suitable for either Through Hole Reflow (THR) soldering or Wave soldering.