M9 connectors are small circular industrial connector with a 9 mm metric thread (M9 × 0.5) commonly used for compact sensors, instrumentation devices, and miniature automation equipment.
It belongs to the metric circular connector family (like M5, M8, and M12), but is smaller and used where space is limited.
Key Characteristics
1. Thread Size
M9 × 0.5 threaded coupling
Diameter: about 9 mm
2. Pins Number
Multiple pin configurations:
•2-pin
•3-pin
•4-pin
•5-pin
•6-pin
•7-pin
•8-pin
3. Compact Design
Much smaller than M12 and M8 connectors
Designed for miniature sensors and tight spaces
4. Waterproof Options
Many versions offer:
IP67 / IP68 protection
Sealed cable assemblies
Common Applications
M9 connectors are typically used in small signal transmission rather than power.
Typical applications include:
Miniature sensors
Medical instruments
Industrial instrumentation
Measurement devices
Optical equipment
Robotics small modules