Hellermann Tyton Pre-Insulated Terminal Blue Ring Lug M4 Hole

Hellermann Tyton Blue Ring Lug M4: Precision-Engineered Pre-Insulated Terminal for 1.5–2.5 mm² Conductors

Reliable Double-Grip Crimp Connection for High-Vibration Environments

The Hellermann Tyton Pre-Insulated Blue Ring Lug M4 is a professional-grade electrical terminal designed for secure, long-lasting connections in demanding applications. Engineered with a double-grip crimp system, this terminal provides exceptional mechanical strength and electrical conductivity, making it ideal for use in automotive, marine, industrial, and control panel wiring where vibration and movement are constant concerns.

Unlike standard single-crimp terminals that rely on a basic barrel compression, the double-grip design features a secondary crimp sleeve that independently secures the conductor insulation. This dual-point fixation significantly reduces the risk of wire pull-out and fatigue failure, ensuring consistent performance over the life of the installation. Whether you're wiring a fuse box, grounding a component, or terminating sensor leads, this terminal delivers the reliability professionals demand.

Colour-Coded Vinyl Insulation for Instant Identification and Safety

The terminal’s blue vinyl insulation conforms to international colour-coding standards, allowing for immediate visual identification of the conductor size range (1.5–2.5 mm²). This not only speeds up assembly and maintenance but also reduces the likelihood of mismatched terminations that can lead to overheating or intermittent faults. The insulation is rated for continuous operation at +75 °C, providing a safe touch-proof barrier while maintaining flexibility for easy installation.

Three-Piece Construction for Enhanced Durability

Hellermann Tyton employs a three-piece manufacturing process that combines a high-conductivity copper body, a tin-plated finish for corrosion resistance, and a precisely moulded PVC insulation sleeve. This construction ensures low contact resistance, excellent thermal stability, and long-term protection against oxidation and environmental contaminants. The result is a terminal that performs reliably in both dry and humid conditions, including under-bonnet automotive environments and unsealed electrical enclosures.

Key Features at a Glance

• Double-grip crimp design for superior vibration resistance and pull-out strength
• Colour-coded blue insulation for quick identification of 1.5–2.5 mm² conductors
• M4 stud hole (4.3 mm) for secure fastening to standard metric studs
• Rated up to 27 A and 600 V, suitable for a wide range of low-voltage applications
• Operating temperature +75 °C with PVC insulation for safe handling
• Supplied in resealable packaging for convenient storage and inventory management

Applications Where Precision Matters

This M4 ring terminal is engineered for use in 12 V, 24 V, and 48 V DC systems as well as mains-voltage control circuits, with a maximum voltage rating of 600 V. It is particularly well suited to:

• Automotive wiring harnesses and fuse block connections
• Marine electrical systems exposed to vibration and moisture
• Industrial machinery and control panels requiring reliable terminations
• Solar installations and battery management systems
• DIY electronics projects and prototype builds

With a compact footprint of just 22.5 mm in length and 8.5 mm in width, the terminal fits easily into tight spaces without compromising on current capacity. The 4.3 mm hole diameter accommodates M4 studs, ensuring a snug fit that minimises movement and potential arcing.

Why Choose Hellermann Tyton Over Generic Terminals?

Generic ring terminals often suffer from inconsistent crimp quality, thinner insulation, and lower-grade copper alloys that can lead to premature failure. Hellermann Tyton’s precision manufacturing and rigorous quality control address these risks by delivering:

• Consistent barrel dimensions for reliable crimping with standard tools
• High-purity copper construction for maximum conductivity and minimal voltage drop
• Durable PVC insulation that resists cracking, abrasion, and common chemicals
• RoHS compliance for environmentally responsible sourcing

By choosing a terminal engineered to these standards, you reduce the risk of intermittent connections, overheating, and costly downtime in critical systems.

Installation Best Practices

For optimal performance, use a calibrated ratchet crimping tool designed for insulated terminals. Ensure the conductor is fully inserted into the barrel and that the crimp is centred over the wire strands. The double-grip design requires two distinct crimps: one on the conductor barrel and one on the insulation support sleeve. Always verify the crimp integrity with a pull test before energising the circuit.

Note: The 27 A rating represents the maximum current under ideal conditions. Typical de-rating factors such as ambient temperature, bundling, and duty cycle should be applied in accordance with local wiring regulations.

Secure Your Connections Today

Upgrade your wiring projects with the Hellermann Tyton Pre-Insulated Blue Ring Lug M4. Whether you're maintaining a fleet vehicle, building a custom harness, or stocking your workshop, this terminal delivers the quality and reliability you need. Add to your order now and experience the difference that precision engineering makes.