Ring Terminals for Battery, Ground, and Secure Wire Connections

Some wire connections need to stay locked in place. No slipping off, no loose fit, no wondering if it's making good contact. That's what ring terminals are for.

You'll see them on battery connections, ground wires, fuse blocks, switches, and all kinds of equipment. If a wire needs to bolt down and stay there, this is usually the right connector for the job.

Small part, but it does a lot of work.

What They Are

A ring terminal has two ends.

One side is the barrel where the wire gets crimped in place.

The other side is the ring that goes over a stud, screw, or bolt.

Once it's tightened down, the wire stays secure until you remove the hardware. That's why they're used so often in vehicles, trailers, equipment, and general electrical work.

Where People Use Them

Anywhere a wire needs a solid mounting point.

Battery terminals
Ground wires
Fuse panels
Relays
Switches
Trailer wiring
Power distribution blocks
General repairs

If the wire needs to be fastened down instead of plugged in, ring terminals are usually the answer.

Picking the Right One

This is where people usually get it wrong.

You need the correct wire size and the correct hole size.

The barrel has to match your wire gauge so it crimps tight.

The ring opening has to fit the stud or bolt you're attaching it to.

Too small, it won't fit. Too big, it can move around.

If the connection is exposed, insulated terminals can help protect it.

If it's a heavier power connection, go with a stronger copper terminal built for higher load.

Mistakes That Cause Problems

Using the wrong size ring.
Using the wrong wire gauge.
Weak crimp from using the wrong tool.
Bolting it onto rust, paint, or dirty metal.
Not tightening the hardware enough.

Most failures come from bad contact, not the terminal itself.

How to Install Them

Strip the wire clean.
Insert it fully into the barrel.
Crimp it with the right tool.
Place the ring over the stud or bolt.
Tighten it down firmly.

If it's a ground wire, make sure the metal surface is clean before installing. That alone solves a lot of issues.

Why Quality Matters

Cheap ring terminals bend easily, crack, or don't crimp well.

Better ones hold shape, grip the wire properly, and carry current without becoming the weak point in the system.

If it's tied to power or grounding, use something you trust.

FAQs

What size ring terminal do I need?

Match the wire gauge first, then match the hole size to the stud or bolt.

Can I use these on a battery?

Yes. They're commonly used for battery cables and accessory power leads.

Do I need a crimping tool?

Yes. You'll get a tighter, more reliable connection than using makeshift tools.

Ring terminals or eyelet terminals, are available for a wide range of wire and stud sizes. Used for termination of wires, our ring terminals are made from pure electrolytic copper and Grade A crimping vinyl.

Use our ring terminals where an insulated barrel is necessary and desirable. Our terminal consists of a butted seam part with flared, rigid molded polyvinyl chloride. The ring terminal is securely attached and funneled for easy wire entry.

Our ring terminals provide a variety of design features assuring consistently effective, reliable performance and easy installation.

Insulation has a flared entry for easier wire insertion.
Industry standard color-coded to indicate wire size range.
Our vinyl insulated ring terminals are Electro-tin plated for corrosion resistant.
Funneled chamfered entrance for easy wire insertion into ring terminal.
Annealed for maximum strength.
A full crimping barrel length of 1/4” or longer is standard on all of our eyelet terminals.
Have a deep internal “V” groove to promote wire grip and current flow.
The Injection-molded insulation on our 3M ring terminals are the highest quality in the industry.
Open-end design on our ring terminals permits visual inspection of wire location before and after crimping.
Our ring terminals insulators are rated at a continuous operating temperature range from -40°F to 221°F (-40°C to 105°C).
All ring terminals are UL listed and CSA Certified for 600V building wire and 1,000V signs and lighting fixtures (luminaries).