M9 Circular Connector Specification Parameters (Dimensions, Number of Pins, Electrical Parameters)
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- Issue Time
- Dec 29,2025
Summary
The M9 Circular Connector Specifications and Parameters define the mechanical, electrical, and environmental performance of compact metric connectors used in industrial automation, sensors, and control systems. Thanks to their small footprint and reliable performance, M9 circular connectors are widely applied where space-saving and signal stability are critical.
M9 Circular Connector Specification Parameters (Dimensions, Number of Pins, Electrical Parameters)
Introduction
The M9 Circular Connector Specifications and Parameters define the mechanical, electrical, and environmental performance of compact metric connectors used in industrial automation, sensors, and control systems. Thanks to their small footprint and reliable performance, M9 circular connectors are widely applied where space-saving and signal stability are critical.
M9 Circular Connectors
Rugged, compact and versatile — ideal when you need mixed power & signal plus environmental protection.
M9 Circular Connector Dimensions
Dimensions are a key factor when selecting an M9 circular connector, especially for compact installations and panel-mount applications. The standardized M9 × 0.5 thread ensures compatibility across devices while maintaining secure locking.
Typical Dimension Characteristics
Thread size: M9 × 0.5
Outer diameter: approximately 12–14 mm
Cable outlet diameter: 3.5–5.0 mm
Compact length for space-limited installations
Specification dimensions of M9 circular connectors
Conode M9 circular connectors are precisely tailored to industrial scenarios. With stable transmission performance and a precisely designed panel slot, they enable convenient and efficient installation, providing a reliable connection solution for automated equipment.
Number of Pins and Contact Configurations
One of the most important M9 Circular Connector Specification Parameters is the number of pins. Different pin counts allow the connector to support various signal and power requirements.
Common Pin Options
2 pins – basic signal or power transmission
3–4 pins – sensors and industrial control signals
5–6 pins – mixed signal applications
8 pins – compact multi-signal connections
The number of pins of M9 circular connectors
Conode M9 circular connectors are available with multi - specification pin configurations ranging from 2 - to 8 - pins. They feature a solid metallic texture, are suitable for industrial sensors and automated equipment, ensure stable signal transmission, and offer convenient and durable plug - and - unplug operations.
Electrical Parameters of M9 Circular Connectors
Electrical performance is at the core of M9 Circular Connector Specifications and Parameters. Stable current transmission, low contact resistance, and reliable insulation ensure consistent operation in demanding industrial environments.
Key Electrical Specifications
Rated voltage: up to 60 V
Rated current: 1–3 A per contact (depending on pin count)
Contact resistance: ≤ 5 mΩ
Insulation resistance: ≥ 100 MΩ
Structure, Materials and Protection
In addition to dimensions and electrical parameters, connector structure and protection levels are essential parts of the overall M9 Circular Connector Specifications and Parameters. High-quality materials and sealing design enable reliable use in harsh environments.
Material and Protection Features
Housing: nickel-plated brass or high-performance plastic
Contacts: copper alloy with gold plating
Sealing: silicone or FKM O-ring
Protection rating: IP67 (optional IP68)
Demonstration of IP67 Waterproof Performance of M9 Circular Connectors
Conode M9 circular connectors fully demonstrate their robust IP67 protection capabilities. Unaffected by dust and water, they ensure stable transmission even in harsh environments, providing reliable connection safeguards for outdoor and industrial control scenarios.
Conclusion
In conclusion, it is of great importance to understand the specifications and parameters (including dimensions) of M9 circular connectors. The Conode M9 model offers consistent high - quality performance and peace of mind for your projects.
What are the standard dimensions of an M9 circular connector?
The M9 circular connector typically features a 9 mm metric thread (M9 × 0.5), an outer diameter of 12–14 mm, and a cable outlet diameter of 3.5–5 mm. These compact dimensions make it ideal for space-constrained industrial applications.
How many pins are available in M9 circular connectors?
M9 circular connectors are available in 2, 3, 4, 5, 6, and 8-pin configurations. Each pin layout supports different signal or power requirements, providing flexibility for sensors, automation systems, and control devices.
What are the electrical parameters of M9 circular connectors?
Key electrical specifications include:
Rated voltage: up to 60 V
Rated current: 1–3 A per contact (depending on pin count)
Contact resistance: ≤ 5 mΩ
Insulation resistance: ≥ 100 MΩ
These parameters ensure reliable and stable signal transmission in industrial environments.
What is the protection level of M9 circular connectors?
Most M9 circular connectors are rated IP67, providing dust-tight and water-immersion protection. Some models offer IP68 for enhanced waterproofing, making them suitable for harsh industrial conditions.
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