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The M12 Series Waterproof Connector is Reunion's flagship industrial interconnect, designed to meet the broadest range of automation applications — from discrete sensors to high-speed fieldbus networks. Certified to DIN EN 61076-2-101/109/111, this threaded circular connector delivers IP67-rated sealing against dust and temporary immersion, making it suitable for washdown environments, outdoor installations, and machinery with coolant exposure. The connector's all-metal construction provides mechanical durability and EMI shielding, while the threaded locking mechanism ensures vibration-resistant mating — critical for equipment with moving components.
Available in 2 to 17-pin configurations across multiple coding options (A, B, C, D, X, S, L, K, T, Y, M), the M12 series supports virtually every industrial protocol: discrete sensor signals, analog outputs (4-20mA, 0-10V), fieldbus networks (PROFIBUS, DeviceNet, CANopen), and high-speed Ethernet (PROFINET, EtherNet/IP). Contacts are machined from brass with selective gold plating, maintaining contact resistance below 3mΩ across hundreds of mating cycles. Reunion manufactures the M12 series through a vertically integrated process — from precision machining and injection molding through automated assembly and 100% electrical testing. Available in unshielded and 360° shielded versions, with panel-mount connectors offered in solder, dip-solder, crimp, or flying-lead terminations, the M12 series adapts to diverse equipment designs. For engineers designing factory automation, process control, or transportation systems, this connector provides a reliable, standardized, and cost-effective interconnect solution for the most demanding industrial environments.
| Feature | Benefit |
| Multiple Coding Options (A/B/C/D/X/S/L/K/T/Y/M) | Prevents mismating in mixed-protocol installations — different codes for sensors, power, fieldbus, and Ethernet. |
| 2 to 17-Pin Configurations | Supports everything from simple proximity sensors to complex multi-signal devices and fieldbus connections. |
| IP67 Environmental Sealing | Dust-tight and protected against temporary immersion — reliable in washdown, outdoor, and high-humidity environments. |
| Threaded Locking Mechanism | Vibration-resistant mating prevents signal interruption from machinery movement — critical for continuous production. |
| Gold-Plated Contacts | Low contact resistance (≤3mΩ) and corrosion protection — essential for low-level analog and high-speed digital signals. |
| Shielded and Unshielded Options | 360° shielding for EMI-sensitive applications (analog, Ethernet, fieldbus); unshielded for standard discrete signals. |
| DIN EN 61076‑2‑101/109/111 Compliant | Full interchangeability with M12-compliant devices and cables from all major manufacturers. |
| PUR Cable Option | Oil-resistant, chemical-resistant jacket withstands exposure to coolants, cutting fluids, and washdown chemicals. |
| Parameter | A-coded | B-coded | C-coded | D-coded | X-coded | S/L-coded |
| Primary Application | Sensors, actuators | PROFIBUS, DeviceNet | AC power | Ethernet (100 Mbps) | Ethernet (Gigabit) | AC power, AC servo |
| Pin Count | 2-17 | 4-5 | 3-6 | 4 | 8 | 2-4 |
| Current Rating | 1.5-4A | 4A | 1.5-4A | 4A | 0.5A | 12-16A |
| Voltage Rating | 30-250V | 250V | 60-250V | 250V | 50V | 250-630V |
| Mating Cycles | ≥100 times | |||||
| Temperature Range | -25°C ~ +85°C | |||||
| Protection Rating | IP67 (mated) | |||||
| Salt Mist Resistance | 48 hours | |||||
| Shielding | Unshielded or 360° shielded (D-code, X-code shielded as standard) | |||||
All materials are RoHS compliant. Every M12 connector undergoes 100% electrical testing (continuity, insulation resistance, dielectric withstand) before shipment. IP67 sealing is verified on a sample basis per batch using actual immersion testing.
The M12 Series Waterproof Connector is deployed across virtually every industrial sector, serving as the standard interconnect for sensors, fieldbus networks, and power distribution.
- Sensor Networks — Proximity, photoelectric, inductive, and temperature sensors (A-code).
- Fieldbus & Industrial Ethernet — PROFIBUS (B-code), DeviceNet, CANopen, PROFINET (D-code), EtherNet/IP (X-code).
- Power Distribution — AC and DC power for motors, actuators, and lighting (C-code, S/L-code).
- Robotics — Servo drive connections, end-of-arm tooling, and safety systems.
- Automotive Manufacturing — Paint shop sensors, assembly line monitoring, and weld cell controllers.
- Food & Beverage Processing — Washdown-resistant sensors and actuators on bottling and packaging lines.
- Renewable Energy — Solar tracking systems, wind turbine sensors, and battery storage monitoring.
- Transportation — Railway rolling stock, signaling equipment, and infrastructure monitoring.
A Germany manufacturer was upgrading their body shop assembly line to PROFINET communication, requiring D-coded M12 connectors for the network backbone and A-coded connectors for the sensor networks. Reunion supplied D-coded M12 connectors with 4-pin shielded configurations and A-coded connectors with 8-pin unshielded configurations. Over 4000 connectors were installed across 12 assembly stations. After 24 months of operation, the client reported a network uptime of 99.99%, with zero connector-related communication failures. The maintenance team noted that the D-coded connectors' robust shielding effectively protected the PROFINET communication from welding and VFD noise.
| Aspect | Reunion M12 Series | Premium European M12 Brands | Low‑Cost Unbranded M12 |
| Price | Volume‑friendly pricing | 3‑4× higher | Cheaper upfront |
| Gold Plating | Standard | ≥0.2‑0.4µm | Thin or none |
| IP67 Verification | Batch immersion‑tested | Batch‑tested | Not verified |
| 100% Electrical Testing | Every unit | Sample‑based | Random or none |
| Coding Options | A/B/C/D/X/S/L/K/T/Y/M — all standard | Usually A, B, C, D only | Limited codes |
| Pin Configurations | 2‑17 — comprehensive | 4‑12 typical | Variable, often incomplete |
| Cable Assembly | In‑house controlled, PUR/PVC options | Often outsourced | Manual, inconsistent |
| Traceability | ERP traceable from resin to finished connector | Yes | None |
| Lead Time | 12‑15 days | 4‑8 weeks | Unpredictable |
| Customization MOQ | Low (100 pieces for custom assemblies) | High (500+) | Not offered |
| Technical Support | 24‑hour response from 10‑person engineering team | Good but slower | Limited |
| ISO Certifications | 9001, 14001, 13485 | Usually 9001 | Typically none |
| Certification | Scope |
| ISO 9001:2015 | Quality management — design, production, and after‑sales service. |
| ISO 14001:2015 | Environmental management — verified waste reduction and sustainable practices. |
| ISO 13485:2016 | Medical device quality management — applicable for M12 used in diagnostic or monitoring equipment. |
| RoHS | Restriction of hazardous substances — compliance with EU Directive. |
Reunion's M12 production line operates under statistical process control (SPC). IP67 sealing is verified on every production batch through actual immersion testing (1m, 30 minutes). Test records, material certificates, and inspection reports are retained for each batch, supporting your quality audits and customer documentation requirements.
M12 coding prevents mismating of connectors used for different signal types and power levels. Here is a practical guide:
| Code | Primary Application | Typical Pin Count | Key Characteristic |
| A-code | Sensors, actuators, IO-Link, DC power | 2-17 | Most common, general-purpose |
| B-code | PROFIBUS, DeviceNet, CANopen | 4-5 | Fieldbus communication |
| C-code | AC power (industrial) | 3-6 | Higher voltage/power |
| D-code | Industrial Ethernet (100 Mbps) | 4 | PROFINET, EtherNet/IP |
| X-code | Gigabit Ethernet | 8 | CAT6a, 10 Gbps-capable |
| S-code | AC power (servo motors, high current) | 2-4 | 12A+ current rating |
| L-code | DC power (high current) | 4 | 16A current rating |
| T-code | DeviceNet (alternative) | 4 | Less common |
| K/Y/M-code | Specialized applications | Varied | Consult manufacturer |
Select the code that matches your device's mating interface and protocol. If you are unsure, send us your device part number or connector specification — Reunion's engineering team can identify the correct coding option.
Yes — the X-coded M12 connector is specifically designed for Gigabit Ethernet (10/100/1000 Mbps) applications, providing the shielding and impedance matching required for high-speed data transmission. Reunion's X-code M12 connectors feature:
- 8-pin configuration (4 pairs for differential signaling)
- 360° shielding for EMI protection
- CAT6a-compliant performance (up to 10 Gbps over 30m)
- IP67 sealing for washdown environments
We have supplied X-code M12 connectors for industrial vision systems, robotic control, and high-speed inspection equipment.
To achieve and maintain IP67 sealing, Reunion recommends:
- Mating torque — Hand-tighten the coupling nut until the O-ring contacts the panel surface, then apply additional torque of 0.5-0.7Nm for A/B/C/D-coded connectors and 0.8-1.0Nm for S/L-coded high-power connectors. Do not exceed the maximum recommended torque.
- O-ring inspection — Replace the O-ring if deformation, cracking, or hardening is visible. O-rings are available as service parts.
- O-ring replacement schedule — For demanding washdown applications, replace O-rings annually. For standard environments, every 2-3 years is sufficient.
- Cable bend radius — Maintain a minimum bend radius of 5× cable diameter at the connector entry.
- Cleaning — For washdown applications, clean connector exteriors with mild detergent. Avoid pressure washers directed at the mating interface.
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