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M12 Circular Connector

Industrial Automation Standard Interfaces Integrated Connection Solutions for Signal / Data / Power

CONNODER M12 circular connectors are designed in accordance with the international standard IEC 61076-2-101, making them one of the most widely used standard connector systems in industrial automation. Featuring a 12 mm threaded locking mechanism, they offer excellent vibration resistance, water and dust protection, and stable signal transmission. They are widely applied in sensors, actuators, industrial networks, robots, and automation control systems.

✔Industrial standard interface (IEC 61076-2-101)
✔Supports signal / power / industrial Ethernet transmission
✔Multiple coding systems: A / B / D / X / S / T
✔High protection rating: IP67 / IP68
✔2–17-pin configuration
✔Supports overmolded cable / field wiring / panel mount

What is an M12 Circular Connector?

An M12 circular connector is an industrial standard connector featuring a 12 mm threaded locking mechanism (M12×1), in accordance with the international specification IEC 61076-2-101, used for signal transmission, data communication, and power connection in industrial automation systems.

Thanks to its standardized structure, high reliability, and strong vibration resistance, the M12 connector has become one of the most widely used connection interfaces in industrial equipment worldwide.

Understanding M12 Connectors in One Minute

✔Standard connection interface for industrial automation ✔Used for sensors, PLCs, and I/O modules ✔Supports industrial Ethernet (PROFINET / EtherCAT) ✔Multiple coding options for mis-mating prevention ✔Suitable for harsh industrial environments

Why Are M12 Connectors Widely Used in Industrial Equipment?

With the advancement of Industry 4.0 and smart manufacturing, equipment demands higher performance from connection systems:

Higher reliability Smaller installation space Stronger vibration resistance More stable data transmission Greater standardization and compatibility

The M12 connector has become the industrial standard interface precisely to meet these requirements.

M12 Key Advantages

✔ Standardized interface system

A globally unified IEC standard ensures high compatibility and interchangeability.

✔ Vibration-resistant design

The threaded locking mechanism prevents loosening under mechanical vibration.

✔ High protection rating

IP67/IP68 rated for humid, dusty, and outdoor environments.

✔ Multi-protocol support

Supports analog signals, digital signals, and industrial Ethernet communication.

✔ Highly reliable electrical performance

Gold-plated contacts reduce contact resistance and enhance signal stability.

Why Choose CONNODER M12 Circular Connectors?

CONNODER specializes in the R&D and manufacturing of industrial circular connectors, offering a complete product range covering M5, M8, M9, M12, M16, and 7/8", providing standardized and customized connection solutions for industrial customers worldwide.

Manufacturing & Quality Capabilities

✔Precision mold design and development
✔Fully automated injection molding and assembly lines
✔100% electrical performance testing
✔Waterproof and aging test systems
✔OEM / ODM customization capability
✔Industrial-grade quality control system

M12 Circular Connector Product Range

M12 A-coded connector

M12 A-coded Connectors

Standard signal connection for sensors and actuators, available in 2–17-pin configurations.

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M12 B-coded connector

M12 B-coded Connectors

An interface solution specifically designed for Fieldbus and specific control systems.

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M12 D-coded connector

M12 D-coded Connectors

Primarily used for data transmission, especially Fast Ethernet applications supporting 100 Mbps.

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M12 K-coded connector

M12 K-coded Connectors

High-power connector supporting power transmission up to 630 V / 16 A.

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M12 L-coded connector

M12 L-coded Connectors

A circular connector solution designed for high-power transmission in industrial environments.

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M12 M-coded connector

M12 M-coded Connectors

DC power connector supporting power transmission up to 63 V / 12 A.

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M12 S-coded connector

M12 S-coded Connectors

Primarily used for AC power supply applications, offering high reliability, excellent protection performance, and broad industry compatibility.

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M12 T-coded connector

M12 T-coded Connectors

Primarily used to distinguish power connections from signal or data connections, preventing mis-mating.

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M12 X-coded connector

M12 X-coded Connectors

High-performance industrial Ethernet connector supporting 10GBASE-T1, ideal for Industry 4.0 applications.

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M12 Circular Connector Technical Specifications

 

Electrical Performance

  • Rated voltage: Up to 250 V
  • Rated current: 1 A–16 A (depending on model)
  • Contact resistance: ≤ 5 mΩ
  • Insulation resistance: ≥ 100 MΩ
 

Mechanical Performance

  • Mating cycles: ≥ 500 cycles
  • Locking type: M12×1 threaded locking
  • Configurations: Straight / angled / panel mount
 

Environmental Performance

  • Protection rating: IP67 / IP68
  • Operating temperature: -40 ℃ ~ +85 ℃
  • Vibration resistance: Industrial-grade standard
 

Materials

  • Housing: Nickel-plated brass / stainless steel
  • Contacts: Gold-plated copper alloy
  • Insulator: High-strength engineering plastic (PA9T, PA66)

M12 Circular Connector Applications

Industrial Automation Systems

For PLC, I/O module, and control system connections

Sensors & Detection Systems

For photoelectric, proximity, and pressure sensors

Robotic Systems

For joint control and signal transmission

Machine Vision Systems

For industrial camera and controller connections

Industrial Ethernet

Supports PROFINET / EtherCAT communication

Servo & Drive Systems

For encoder and drive connections

Packaging & Conveying Equipment

Suitable for high-speed automated production lines

New Energy Equipment

For energy storage and control system connections

How to Choose the Right M12 Circular Connector?

 
1

Define the Application

Determine whether the connector is used for signal transmission, power supply, or data communication — this is the primary basis for selection.

 
2

Select the Coding Type

Choose the appropriate coding type (A/B/D/X/S/T, etc.) based on the application scenario. Different codings correspond to different protocols and functions, preventing mis-mating.

 
3

Choose the Pin Count

Select a 2/3/4/5/8/12/17-pin configuration based on the number of signal or power circuits, ensuring both current and future expansion needs are met.

 
4

Determine the Configuration

Choose straight, angled, or panel mount versions based on installation space and routing direction, optimizing cable layout and assembly efficiency.

 
5

Select the Protection Rating

Choose IP67 or IP68 protection based on the operating environment, ensuring reliable performance under dust, water spray, or immersion conditions.

 
6

Shielding Requirements

In strong electromagnetic interference environments, choose connectors with shielding to ensure signal integrity and data transmission stability.

Differences Between M8, M9, and M12 Circular Connectors

Item M8 M9 M12
Size Smallest Small Medium
Current-carrying capacity Low Medium High
Applications Sensors Compact devices Industrial automation
Protection rating IP67 IP67 IP67 / IP68
Communication capability Basic signals Signals Industrial Ethernet
Installation space Very small Small Medium

CONNODER Manufacturing Strength

From mold development to outgoing inspection, the entire process is under our own control, ensuring the precision and reliability of every M12 circular connector

Mold Development
Our in-house tool room is equipped with wire-cut EDM and mirror spark erosion machines, achieving mold precision of ±0.005 mm and 48-hour rapid sampling, ensuring product consistency from the source.
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Precision Injection Molding
Imported vertical injection molding machines in a temperature- and humidity-controlled workshop ensure dimensionally stable plastic parts free of flash, meeting the M9 connector's high requirements for sealing and mating feel.
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CNC Machining
Multi-axis CNC machining centers precisely turn metal housings and contacts, keeping thread tolerances within ±0.01 mm to ensure smooth locking and shielding integrity.
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Automated Assembly
Fully automated assembly lines integrate vision positioning and torque control, with a capacity of over 3,000 pcs/hour, eliminating manual assembly errors and ensuring consistent batch quality.
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In-line Inspection
In-line CCD vision inspection and electrical testing stations screen defects such as contact misalignment and insulation faults in real time; defective parts are automatically rejected, preventing defects from flowing to the next process.
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Outgoing Inspection
Each batch undergoes IP67 waterproof air-tightness testing, 500-cycle mating life verification, and salt spray testing. All inspection reports are provided with shipment, with fully traceable data.
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Packaging & Shipping
Triple protection with antistatic trays, individual PE bags, and shockproof outer cartons; labels include batch numbers and QR codes, supporting MES scan-in, with end-to-end logistics tracking.
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Quality Management
ISO 9001 certified, implementing SPC (Statistical Process Control) with critical process CPK ≥ 1.33, driving zero-defect delivery through continuous improvement.
Production process diagram
Insertion and extraction force tester
Programmable constant temperature and humidity test chamber

M12 Circular Connector FAQ

What standard do M12 connectors follow?
M12 connectors comply with the international standard IEC 61076-2-101, which defines the dimensions, electrical performance, mechanical performance, and coding systems of M12 circular connectors, ensuring compatibility and interchangeability between products from different manufacturers.
Which industrial protocols do M12 connectors support?
M12 connectors widely support mainstream industrial communication protocols, including PROFINET, EtherCAT, EtherNet/IP, Modbus TCP, CANopen, and DeviceNet. Different protocols typically correspond to specific coding types (e.g., D-code for Fast Ethernet, X-code for Gigabit Ethernet).
What is the difference between M12 and M8?
The M12 has a 12 mm thread diameter, while the M8 has 8 mm. The M12 offers higher current-carrying capacity, supports more pins (up to 17), and faster data communication; the M8 is more compact and suits space-constrained sensor connections. Both achieve IP67 protection, and the M12 additionally offers an IP68 option.
Can M12 connectors be used for Ethernet?
Yes. D-code M12 connectors support 100 Mbps industrial Ethernet (e.g., PROFINET), while X-code M12 connectors support Gigabit/10G Ethernet transmission up to 10 Gbps, making them an ideal choice for industrial fieldbus and machine vision systems.
Are M12 connectors waterproof?
Yes. When properly mated, standard M12 connectors achieve at least IP67 protection (protection against temporary immersion); some models reach IP68 (suitable for continuous underwater use, with depth and duration defined by the manufacturer). They fully meet the demands of humid, washdown, and outdoor industrial environments.
How many coding types are available for M12?
Common codings include A-code (signal/DC power), B-code (fieldbus), D-code (Fast Ethernet), X-code (Gigabit Ethernet), and S-code/T-code/L-code (high-power AC/DC) among others. Different codings use keyway designs to prevent mis-mating, ensuring electrical safety and protocol matching.
Can the cable length be customized?
Yes. CONNODER offers pre-wired cable assembly customization, allowing you to specify cable length, jacket material (PVC/PUR/LSZH), shielding type, and connector configurations at both ends to suit specific equipment layouts and environmental requirements.
Are M12 connectors suitable for outdoor environments?
Yes. M12 connectors typically operate from -40 ℃ to +85 ℃, with nickel-plated brass or stainless steel housings offering excellent corrosion and UV resistance. Combined with IP67/IP68 protection and PUR-jacketed cables, they deliver long-term reliable operation in demanding outdoor environments.
Do you support OEM/ODM?
Yes. CONNODER provides OEM/ODM services, including custom pin definitions, special codings, branding, packaging design, and certification support (e.g., FCC, CE), meeting customers' differentiated product and compliance requirements.
What is the mating cycle life?
Standard M12 connectors have a mechanical mating life of ≥ 100 cycles; high-quality products can reach 500 or even over 1,000 cycles. Actual life depends on operating practices, environmental conditions, and maintenance frequency. For frequent mating applications, we recommend high-durability models and regular contact inspection.

Choose a More Reliable M12 Circular Connection Solution for Your Industrial Equipment

Whether you need standard M12 circular connectors, overmolded cable assemblies, or OEM/ODM customization for your project,
CONNODER delivers stable and reliable products, professional engineering support, and fast delivery services.

ISO 9001 Certified RoHS & CE Compliant Trusted by 500+ Customers Worldwide 48-Hour Shipping for Standard Products

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