The Festo SMT-8M-A-PS-24V-E-5-M8D is a T-slot proximity sensor from the SMT-8M series, classified under Proximity Detection Switches. It is designed for pneumatic cylinder position sensing — the T-slot mount drops into the cylinder profile without brackets.
Peer comparison — connector difference matters
The closest functional sibling is the SMTSO-8E-PS-M12-LED-24. Both are Festo T-slot proximity sensors with PNP output and 24 V supply. The key difference: the SMT-8M uses an M8 connector (3-pin, 5 m cable), while the SMTSO-8E uses an M12 connector. That means the M8 variant occupies less space at the cylinder end and mates with a smaller-diameter cable — a meaningful difference if the existing harness is M8-terminated or if panel clearance is tight. The M12 sibling adds an LED indicator; the SMT-8M does not have a visible LED on the body.