RS 3.5mm Stereo Jack Socket, Vertical. Brought to you under the trusted RS Pro brand, this 3-pole stereo jack socket is designed for vertical mounting. Compact and robust, the jack socket has solder tag terminals for secure termination. All models are highly reliable and excellent quality. Features and Benefits. 30m maximum Contact Resistance. Insulation Resistance of 100M minimum at 500 V dv. Dielectric Withstand Voltage of 500V ac for 1 minute