Ring Terminals

A ring terminal is a short metal tube with flat washer type ring attached. The tube or barrel end of a ring terminal connector is a hollow tube where the stranded wire is inserted and crimped. The contact or connection end is a flat ring with a central hole which connects to a stud or bolt.

Ring terminals are available as insulated or non-insulated options, and are used to ensure a secure and durable connection between electrical wires and terminal points for various industrial applications.

Functions of Ring Terminals

Ring terminals connectors play a critical role in the safety and efficiency of electrical, mechanical and automotive systems. They are used to:

• Provide Secure Connections: Ring terminals ensure a stable and secure connection between wires and terminal points. Outside of electrical systems, they are used in automotive and marine applications to connect battery cables to terminals, preventing accidental disconnections and maintaining reliable power delivery.
• Facilitate Easy Installation: The hollow tube of the crimp ring terminal allows for easy insertion of stranded wires, which are then crimped for a tight and secure fit. The process is simple and speeds up installation times.
• Enhancing Electrical Conductivity: Ring terminals provide a dependable connection between electrical wires and terminal points, ensuring a stable and continuous flow of electricity. The design of electrical crimp ring terminals is specifically made to prevent accidental disconnection for reliable safety.

Where Are Ring Terminals Used?

• Electrical panels: Ring terminal connectors are essential in electrical panels for connecting wires to circuit breakers, fuses and bus bars. They ensure a secure and stable connection, which is crucial for maintaining the integrity and safety of the electrical system.
• Terminal blocks: In terminal blocks, cable ring connectors provide a reliable method for terminating wires, allowing for easy attachment and detachment of wires, and a firm connection that can withstand vibrations and mechanical stresses common in industrial environments.
• Wiring harnesses: Wire ring terminal connectors are commonly used in wiring harnesses to connect various electrical components in automotive, aerospace, and industrial applications, providing a durable and stable connection during sudden movements or vibration.

Types of Ring Terminals

There are several types of ring terminals, each designed for specific applications and requirements.

Insulation

• Insulated ring terminal: Insulated ring lugs are coated with an insulating material to prevent electrical shorts and protect the connection from environmental factors. These ring terminals are commonly used in automotive and marine applications where protection from moisture and corrosion is crucial.
• Non-insulated ring terminal: Non-insulated terminal lugs lack an insulating coating and are used in applications where insulation is not a concern. They provide a direct metal-to-metal contact, ensuring a reliable electrical connection.

Material

• Copper: Copper is often used for battery ring terminals, offering excellent conductivity whilst offering great durability and ability to withstand high temperatures.
• Nylon: Nylon ring terminals provide added insulation and flexibility whilst being resistant to impact and abrasion, making them suitable for use in environments where mechanical stress is a concern.
• PVC: PVC ring terminals offer protection against chemicals and abrasion, commonly used in automotive wiring and other rugged environments.
• Steel: Steel ring terminals provide high strength and are often used in heavy-duty applications, suitable for use in high-vibration environments due to their robust construction.

Size

Ring type terminals come in various sizes to accommodate different wire gauges and bolt sizes. The correct size ensures a secure and reliable connection.

• Small ring terminals: Suitable for thin wires and small bolts, often used in electronic applications.
• Medium ring terminals: Commonly used for standard automotive and industrial wiring.
• Large ring terminals: Used for thick wires and large bolts, ideal for heavy-duty applications such as battery connections.

DIN 46237 Colour Coding

The DIN 46237 colour coding system is the most popular way to categorise crimp ring terminals. Each colour denotes different wire sizes:

• Red 0.5 mm² to 1.5 mm
• Yellow 2.5 mm² to 6 mm
• Blue 1.5 mm² to 2.5 mm

Other colours are also available to cover a wider range of wire sizes.

How to Choose the Right Ring Terminal for Your Needs

There are many considerations to take into account when choosing the appropriate type of ring terminal connector for your needs. Before you make your selection, consider factors such as the wire size, type of insulation, material of the connector and the operating environment of the crimp ring terminal.

Determine the appropriate ring type terminal for your specific use, such as an industrial ring terminal for heavy-duty applications, an electrical ring terminal for standard wiring, as well as whether you need an insulated or non-insulated ring lug.

How to Order Ring Terminals from RS Hong Kong?

RS Hong Kong is a trusted supplier and distributor of ring terminals from leading brands. Our range includes brands such as ABB, Molex, TE Connectivity and more. To place an order online, simply browse our extensive catalogue, filter your preferred products based on our extensive specifications, and add to your cart.

How Delivery Works at RS Hong Kong

RS Group offers fast delivery of ring terminals. Our efficient logistics network ensures that your industrial ring terminals, electrical ring terminals, or any other ring wire connectors arrive on time. We provide various delivery options to suit your schedule, whether you need standard or expedited shipping. For more details on delivery services and fees, please refer to our Delivery Page.