M8 connectors are one of the most widely used miniature circular connectors in industrial automation and sensor systems. But how well do you really understand the STA M-Series? Today, let’s take a closer and more comprehensive look at the STA M8 Series, including structure, standards, coding types, features, and selection guide.
STA’s M-Series covers a complete range of metric connectors, including M5, M8, M9, M12, M16, M23, M40, and 7/8″, available in both panel-mount and cable-to-cable versions. Two locking mechanisms—threaded coupling and quick-locking/push-lock—are offered, and the entire series supports IP67 protection for harsh environments.
This article focuses on giving you a full technical breakdown of the M8 Series.
The M8 connector is a compact European circular connector designed for sensor-level applications.
It complies with the IEC 61076-2-104 standard and is available in 3, 4, 5, 6, and 8-pin configurations, with coding types including A-code, B-code, and D-code.
The M8 product family includes:
PCB panel-mount sockets
Molded overmolded cable assemblies
Field-wireable assembly plugs
Typical application fields:
Industrial automation
Sensors & actuators
Robotics
Light industrial networks (Fast Ethernet for D-coded M8)
👉 You may also be interested in: M12 Waterproof Connectors
All M8 connectors meet the IP67 ingress protection rating, ensuring reliable operation in dusty, wet, or outdoor environments.
Gold-plated contact pins
Up to 48 hours of salt-spray resistance
Reduced oxidation and improved long-term conductivity
This ensures consistent current and signal transmission even under long-term field operation.
Threaded coupling (classic M8 screw locking)
Quick-lock / snap-lock versions for fast installation
All plastic M8 versions support push-lock structure for improved user efficiency
M8 4-pin D-code is designed for Fast Ethernet (100 Mbps)
Ensures stable and interference-free network communication
≥ 500 mating cycles
Brass nickel-plated shells provide excellent mechanical durability
Ensures connector stability during frequent connection and disconnection
Operating temperature: -25°C to +80°C
Supports continuous operation in both low-temperature and heated environments
3-pin
4-pin A-code / D-code
5-pin B-code
6-pin
8-pin
Straight plug
Right-angle plug
Quick-lock plug
Panel-mount sockets (front mount / rear mount)
Soldering
PCB mount
Screw-terminal (assembly type)
Current: 1.5A–3A
Voltage: 30V–60V
Match the rating based on your load and signal requirements.
Shielded version (recommended for signal transmission)
Unshielded version (commonly used for power lines)
👉 Need help choosing the right model?
Visit M8 Series Connector Category Page
M8 connectors have become a standard interface in:
Industrial automation lines
Photoelectric sensors
Proximity sensors
Encoders
Robotics and AGV systems
Fast Ethernet field devices
Test and measurement equipment
This makes the M8 series a highly versatile and widely adopted industrial connector.
STA Electronics specializes in the development and manufacturing of industrial and waterproof circular connectors. With over 20 years of experience, STA offers:
Full series of M5–M40 industrial connectors
Custom cable assembly and OEM/ODM services
High-quality materials and strict reliability testing
Global customer support
Explore more STA industrial connector solutions on our official site.
