The E2EC04S12MCB1OMS is a flush-mount inductive proximity sensor from Omron's E2E series, built in a stainless steel barrel just 4 mm wide and 4 mm tall. Its compact form factor fits where larger M8 or M12 sensors won't — think tight gripper fingers, small linear slides, or embedded into a fixture. The 1.2 mm sensing distance means it detects small metal targets at close range; paired with a 4 kHz switching frequency, it picks up fast reciprocating or rotating parts without missing a count. Rated IP67 and housed in stainless steel, it holds up in coolant splash, washdown zones, and metalworking environments where brass or plastic housings might corrode or crack.
The often-paired alternative is the E2BS08KS02MCB120OMS, a flush-mount PNP NO sensor from the E2B series. On paper it offers a longer 2 mm sensing distance and higher 200 mA load current, but the body is an M8 barrel — 13 mm diameter — so it physically will not drop into a panel cutout or bracket sized for the 4 mm E2E. If your application has the mechanical room, the E2B carries IP67 and stainless steel too, but rewiring is minimal since both use the same M8 3-pin connector. For a true drop-in replacement without redesigning the sensor mount, stick with the original 4 mm form factor.