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The M5 Series Industrial Sensor Connector is Reunion's dedicated interconnect for the growing family of miniature industrial sensors — proximity detectors, photoelectric cells, temperature transmitters, and pressure switches that now populate smart factory floors. Certified to DIN EN 61076‑2‑105, this circular connector combines a 5mm coupling interface with a threaded locking mechanism that withstands vibration from adjacent machinery. The IP67-rated housing protects against dust, coolant splashes, and washdown exposure common in food processing and automotive manufacturing environments. Available in 2-, 3-, and 4-pin variants, the M5 series supports both discrete sensor outputs (NPN/PNP) and analog signals (4-20mA, 0-10V). Contacts are precision-machined from brass with selective gold plating, ensuring contact resistance remains stable below 3mΩ across the connector's service life. Reunion manufactures the M5 series entirely in-house, applying the same production discipline — precision machining, injection molding, automated assembly, and 100% electrical verification — that governs our larger industrial connector families. The result is a miniature connector that performs like its bigger counterparts, enabling engineers to deploy smaller, denser sensor arrays without compromising connection integrity.
The M5 series brings essential industrial connectivity to the smallest sensor form factors, offering features that automation engineers specifically require.
| Feature | Benefit |
| 5mm Miniature Interface | Industry's smallest standardized connector — enables sensor pitch reductions down to 15mm for denser automation layouts. |
| IP67 Environmental Protection | Dust-tight and protected against temporary immersion — reliable in washdown, outdoor, and high-particulate factory environments. |
| Threaded Locking Mechanism | Secure mating under continuous machinery vibration — prevents signal interruption from loose connections. |
| DIN EN 61076‑2‑105 Compliance | Guarantees mechanical and electrical interchangeability with industry-standard M5 sensor ports and pre-cabled sensors. |
| Gold-Plated Brass Contacts | Stable contact resistance (≤3mΩ) and corrosion resistance — essential for low-level analog sensor signals. |
| Field-Proven Cable Options | PUR cables resist oils and coolants; PVC options provide cost-effective indoor use. |
| Flexible Terminations | Solder, PCB, and flying-lead panel-mount versions support different sensor housing designs. |
| 100% Factory Testing | Every connector verified for continuity, insulation, and dielectric withstand — no sampling shortcuts. |
| Parameter | Specification |
| Design Standard | DIN EN 61076‑2‑105 |
| Contacts | 2, 3, or 4 pins |
| Current Rating | 1A |
| Voltage Rating | 60V |
| Withstanding Voltage | 800V |
| Wire Gauge | 26AWG ~ 30AWG |
| Insulator Material | PA66 (high-strength engineering plastic) |
| Contact Material | Brass with gold plating |
| Mating Cycles | ≥100 operations (typical 300-500 in practice) |
| Contact Resistance | ≤3mΩ (initial) |
| Operating Temperature | -25°C ~ +85°C |
| Protection Rating | IP67 (mated condition) |
| Salt Mist Resistance | 48 hours |
| Cable Jacket Options | PVC (standard) or PUR (oil-resistant) |
All materials are RoHS compliant. Reunion performs 100% electrical testing on every M5 connector — continuity, insulation resistance, and dielectric withstand — with sample-based environmental testing per batch (thermal cycling, vibration, salt spray) to validate manufacturing consistency.
Reunion recognizes that industrial sensor manufacturers often require tailored cable assemblies and termination configurations to suit their specific housing designs and production processes. The M5 series is engineered for customization at every stage.
Cable Assemblies — Custom length (0.1m to 10m), PUR/PVC jacketing, single-ended or double-ended configurations.
Termination Styles — Solder cup, PCB, or flying leads (stripped and tinned wires).
Connector Orientation — Straight or right-angle versions for panel-mount and cable-mount applications.
Contact Loading — 2-, 3-, or 4-pin; unused positions can be left empty or fitted with dummy contacts.
Cable Marking — Custom printing or heat-shrink labeling for identification.
Packaging — Bulk, anti-static bags, or custom-labeled reels for automated assembly lines.
Reunion's Shenzhen facility controls every critical step in M5 production:
Precision Machining — CNC automatic lathes produce metal shells and contacts to ±0.02mm tolerance.
Selective Plating — Automated barrel plating applies ≥0.3µm gold over nickel underlayer.
Injection Molding — PA66 insulators molded with precision cavity tools.
Cable Preparation — Automated cutting, stripping, and tinning; PUR/PVC extrusion in-house.
Assembly — Semi-automated lines with torque-controlled screw fastening and contact insertion verification.
Testing — 100% electrical verification (continuity, insulation, dielectric); sample-based IP67 leak testing.
Packaging — Anti-static vacuum sealing with desiccant; carton packing for export.
The M5 Series Industrial Sensor Connector competes in a market with both premium European brands and low-cost unbranded alternatives. Reunion's value proposition addresses the gap between them.
| Aspect | Reunion M5 Series | Premium European M5 Brands | Low-Cost Unbranded M5 |
| Price | Cost-effective volume pricing | 3-4× higher | Cheaper upfront |
| DIN Compliance | Full with documented test reports | Yes | Often non-compliant |
| 100% Electrical Testing | Every unit | Sample-based | Random or none |
| IP67 Verification | Batch immersion-tested | Batch-tested | Not verified |
| Cable Assembly | In-house controlled | Often outsourced | Manual, inconsistent |
| Traceability | ERP traceable from resin lot 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 engineering team | Good but slower | Limited |
| ISO Certifications | 9001, 14001, 13485 | Usually 9001 | Typically none |
What this means for sensor OEMs: Reunion's M5 series delivers the documented quality and compliance that factory automation customers demand, at pricing that protects your margin. With in-house manufacturing and full traceability, you receive consistency that low-cost suppliers cannot guarantee — without the premium cost of European brands.
Reunion's quality framework provides sensor manufacturers with the documentation and process controls needed for their own customer approvals and regulatory compliance.
| 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 M5 used in diagnostic sensors. |
| RoHS | Restriction of hazardous substances — compliance with EU Directive. |
Reunion's M5 production operates under statistical process control (SPC), with every batch traceable from incoming raw material to final testing. We retain material certificates, molding parameters, and test records for each batch — supporting your quality audits and customer documentation requirements.
The M5's threaded locking mechanism is designed specifically for continuous vibration environments. Unlike push-pull connectors that rely solely on friction, the M5's M5x0.5 thread provides mechanical retention independent of cable strain. In independent testing — performed by Reunion's lab simulating a 2,000-hour vibration profile per IEC 60068-2-6 (10-500Hz, 5g) with the connector mated — no loosening was observed, and contact resistance remained within specification. We recommend applying a torque of 0.2-0.3Nm for mating, which our assembly tooling ensures in our cable assemblies. For extreme vibration applications (e.g., engines), we also offer a thread-locking adhesive applied to the mating thread at customer request.
Yes. Reunion offers M5 connectors with integrated shielding options:
- Shielded cable variants — Cable assemblies with braided or foil shields (coverage ≥85%).
- Shielded panel-mount connectors — Backshells with 360° clamping contact to the cable shield, terminated to the connector metal shell.
- System grounding — The connector's metal shell provides continuity for grounding via the panel mounting nut.
When ordering, specify "shielded" and provide your cable shield termination requirements. Standard lead time for shielded versions is 15-18 days (slightly longer due to additional assembly steps). Shielded M5 connectors are commonly used in industrial camera and measurement applications where EMI immunity is critical.
To achieve and maintain IP67 sealing, Reunion recommends the following installation practices:
- Torque specification — For panel-mount connectors, tighten the fixing nut to 0.2-0.3Nm (hand-tight plus a quarter-turn with a tool). Over-tightening can stress the O-ring and reduce seal effectiveness.
- O-ring condition — The O-ring seal is pre-installed; ensure it is clean and free from debris before mating. Replace the O-ring after 50 mating cycles for critical sealing applications.
- Cable bend radius — Maintain a minimum bend radius of 5× cable diameter at the connector entry to prevent stress on the cable seal.
- Mating — Thread the connector fully until the O-ring contacts the panel surface. Do not use tools to force mating — hand tightening is sufficient.
For washdown applications, Reunion recommends using the PUR cable option (which resists chemical cleaning agents) and installing the connector with the cable exit oriented downward to prevent pooling of liquids near the seal.
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