M12 B-coded 2-position plug for fieldbus and sensor harnesses
The T4110402021-000 is a 2-position M12 plug with female sockets, B-coded keying, and a threaded coupling nut. It is designed for industrial fieldbus networks — Profibus, DeviceNet, and similar B-coded systems — and for 2-wire sensor/actuator connections that need a sealed, vibration-resistant interconnect. The B-coding prevents accidental mating with A-coded (sensor/actuator) or D-coded (Ethernet) receptacles, so the wiring stays on the correct bus segment. The gold plating handles the repeated mating cycles of field-service reconnects without fretting corrosion. The shell is brass with a nickel finish, and the insert is polyamide (PA) with a PBT/glass-filled backshell. The cable clamp accepts jackets from 0.236" to 0.315" (6.00 mm to 8.00 mm) — the range for standard 2- or 3-conductor industrial sensor cable. Screw termination inside the housing means no crimp tool needed; the field technician strips and tightens.
IP67 sealing and temperature range
The O-ring seal sits on the mating face, not the threads, so the seal is made when the coupling nut is snugged, not over-torqued.
How the 2-position T4110402021-000 compares to the 4-position T4110402041-000
The T4110402041-000 is the same M12 B-coded plug but with 4 positions instead of 2. Both share the 4 A per contact rating, 250 V, IP67, gold plating, screw termination, and the same 6.00 mm to 8.00 mm cable clamp. The choice is driven by the number of conductors in the cable — a 2-wire sensor loop uses the 2-position; a 4-wire Profibus segment or a dual-channel actuator uses the 4-position. The shell size is M12-2 for the 2-position and M12-4 for the 4-position, so the mating receptacle must match the position count.