Collection: Eyelet terminals

Ring Terminal: The Benchmark Screwed Connection

The ring terminal is essential wherever a cable needs to be attached to a stud, bolt, or threaded terminal. Its circular ring completely encircles the fastening rod, ensuring stable electrical contact even in the presence of vibrations—unlike a spade terminal, which can become dislodged under intense vibration.

Preferred uses in automotive applications: ground points on the bodywork, battery terminals (positive and negative), fixed power connections (alternator output, starter), engine ground cables. Always prefer ring terminals over spade terminals for permanent connections exposed to continuous vibrations.

Choosing Your Ring Terminal: Wire Gauge and Diameter

Two critical parameters determine the terminal to use:

• Wire gauge (in mm²) → insulator color: red for 0.5–1.5mm², blue for 1.5–2.5mm², yellow for 4–6mm²
• Inner ring diameter → slightly larger than the screw or stud diameter: M4 (4 mm), M5 (5 mm), M6 (6 mm), M8 (8 mm), M10 (10 mm)

A terminal that is too small will not fit over the screw. A terminal that is too large risks poor contact with the fastening washer. The right approach: measure the stud diameter before ordering.

Installation by Crimping

Use an appropriate crimping tool for the type of terminal (manual crimping with universal pliers is not sufficient for large gauges). Insert the stripped cable into the terminal sleeve and crimp firmly. Never solely solder—crimping ensures better mechanical retention in a vibrating environment. Soldering can supplement crimping in areas exposed to moisture but does not replace it.