What are metrical connectors?

For instance, M5, M8, and M12 connectors typically follow the IEC 61076-2 series of standards, but specific standards like IEC 61076-2-104 for M8 and IEC 61076-2-101 for M12 define the details for these sizes, commonly used in industrial automation and sensor networks. Meanwhile, the larger connectors follow IEC 61076-2-106 (M16) and IEC 61076-2-107 (M23). These connectors are often used for higher power applications, such as motors, machinery, and industrial power distribution.

Würth Elektronic’s M12 family includes sealed variants for harsh industrial environments.

Mounting type or types

Metrical connectors can be mounted in several ways depending on the application, equipment design, and environment. Common mounting types for these connectors include panel mount, PCB mount, inline coupling mount, flange mount, DIN rail mount, bulkhead mount, right angle mount, and free-hanging or cable mount.

Mating cycles

Standard metrical connectors are typically rated for 100 to 500 mating cycles. However, industrial or ruggedized types are often rated for up to 1,000 mating cycles, with extreme and mission-critical types rated for 5,000 or more cycles.

Positions

Metrical connectors come in a variety of pin or contact positions, depending on the specific model and application. These positions indicate how many separate connections (for signals or power) the connector can handle. Typically, the larger the size, the more positions; an M5 has 3 or 4 (signal, power, and basic sensor connections), while the M23 has up to 23 positions for complex servo motor and heavy industrial functions.