M8 to M30 Standard Design Inductive Proximity Sensors Flush-mounting 3-wire, PNP, N/O Operating voltage 10 → 30 V DC Short-circuit proof and reverse polarity protection Balluff part no. Housing Housing length Switching distance Connector BES 516-324-S49-C M8 x 1 54.5 mm 1.5 mm M8 BES 516-325-S4-C M12 x 1 70 mm 2 mm M12 BES 516-326-S4-C M18 x 1 83 mm 5mm M12 BES 516-327-S4-C M30 x 1.5 83 mm 10mm M12