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Speed clips and U-nuts explained

3 min read · Clip types explained

A speed clip is a small spring steel clip that slides over the edge of a panel and gives a screw a thread to bite into. You will also hear them called U-nuts, J-nuts, clip nuts or speed nuts.

U-nut or J-nut?

A U-nut has two legs of the same length. A J-nut has one leg shorter than the other, which helps where there is less room on one side. Both do the same job.

Where cars use them

• Under-trays and engine covers
• Bumper mounts and splash shields
• Inner guards and wheel arch liners
• Trim panels and brackets

They are handy because you only need access from one side: the clip sits behind the panel and the screw goes in from the front.

How to size a speed clip

• Screw size: the hole or formed thread must suit your screw.
• Panel thickness: the clip must grip the panel without being forced open.
• Edge distance: how far the hole is from the panel edge.
• Overall size: width and length, so it fits the space.

Our speed clips pages list the sizes marked on each photo. Matching screws are in our range too.

When to replace one

Speed clips are often treated as single use. Once the spring has opened up, or the clip has rusted, it will not hold the screw tight. If a screw spins without tightening, the clip is the first thing to check.

Speed clip or screw grommet?

A speed clip sits on a panel edge. A screw grommet sits in a hole away from the edge. Use whichever the car came with. More on grommets in screw grommets explained.

U-type and J-type

A U-type clip has two equal legs and wraps around the panel edge. A J-type has one longer leg, which helps when the hole is further from the edge. Some speed clips are flat with a stamped thread, and some are plastic. Use the same style as the one you removed.

Fitting tips

1. Slide the clip on so the threaded side faces the screw head.
2. Line up the clip hole with the panel hole before fitting the screw.
3. Do the screw up snugly. Over-tightening flattens the clip and strips its grip.

Speed clip sizes in our range

Speed clips are measured by their overall length and width and, where there is one, the hole or thread size. Most of ours are sold in packs of 15. These are the sizes marked on our product photos:

Sizes are approximate, read from the measurement marks on our product photos. Always compare with your original part.

Frequently asked questions

What is the difference between a speed clip and a U-nut?

Usually nothing; both names describe a spring steel clip that slides over a panel edge.

Why does my screw spin in the speed clip?

The clip has spread or its thread has worn. Replace the clip rather than using a bigger screw.

Sizes and fitting steps in our guides are general. Check your vehicle's manual for anything specific to your car. Questions? Call 0499 001004.