The M12 circular connector is the workhorse of industrial automation, standardized under IEC 61076-2-101. With a 12mm threaded coupling ring and availability in 3 to 17-pin configurations across multiple codings (A, B, D, X, and others), the M12 handles everything from basic sensor connections to Industrial Ethernet, Profinet, EtherCAT, and power distribution. The 4-pin A-coded version is the most common for sensor/actuator networks, while D-coded 4-pin handles 100 Mbps Ethernet and X-coded 8-pin supports Gigabit Ethernet. M12 connectors are manufactured by every major industrial connector company and are interchangeable across brands due to IEC standardization. Their robust threaded coupling, IP67 sealing, and proven reliability make the M12 the most important connector in modern industrial automation — found on virtually every sensor, actuator, and I/O module in automated production facilities worldwide.
Specifications
Pin Count
4
Wire Gauge Range
24–18 AWG
Voltage Rating
60 VDC
Current Rating
4A continuous
IP Rating
IP67
Mating Cycles
100
Operating Temp
-25°C to +85°C
Key Features
IEC 61076-2-101 standardized for universal compatibility
Multiple codings: A (sensor), B (fieldbus), D (Ethernet), X (GigE)
Available in 3 to 17-pin configurations
IP67 sealed when mated
Threaded coupling resists vibration loosening
Supports Industrial Ethernet, Profinet, EtherCAT, and IO-Link
wiringharness.co