How to Identify a Locking Wheel Nut Key From a Photo

Nearly everyone who contacts us opens with some version of the same sentence: I don't know what I'm looking for. That's completely normal. Locking wheel nut patterns aren't written anywhere obvious, they aren't listed by registration, and there's no reason on earth you'd know yours.

So don't try to work it out. Take one good photo and let us do it. This page explains exactly what we need to see and why.

What we're actually looking at

The end of a locking wheel nut has a pattern machined into it — a ring of splines, a star, a set of lobes, or a shaped cut-out. That pattern is the lock. The key is simply a socket with the mirror image of it.

Each manufacturer uses a family of these patterns, numbered. Identifying one is a matter of comparing your pattern against a reference set, which is what we do all day. What we can't do is guess it from your car's make and model alone, because two identical cars off the same production line can have different pattern numbers.

That's the single most important thing to understand: the answer is on your wheel, not in your logbook.

What to photograph

Just the locking nut, on the car, as it sits. One wheel is enough — all four will be the same. You do not need to remove anything.

The locking nut is the odd one out on the wheel: on most cars four of the five bolts look normal and one has a patterned face, sometimes with a chrome or black cap over it. If there's a plastic cap, prise it off gently with a fingernail or a small screwdriver wrapped in cloth — the pattern is underneath.

How to take a photo we can actually read

• Straight on. Hold the phone square to the face of the nut, not at an angle. An angled shot foreshortens the splines and makes counting them unreliable.
• Close, but focused. Get within about 15cm and tap the screen on the nut so the phone focuses there. A sharp photo from 30cm beats a blurry one from 5cm.
• Daylight, no flash. Flash blows out the metal and flattens the pattern into a white blob. Outdoors in the shade is ideal.
• Clean it first. Ten seconds with a rag makes an enormous difference. Brake dust packs into the splines and hides them.
• Don't crop or zoom. Send the full photo. Digital zoom throws away the detail we need.

If you also still have the old key, even a chewed one, photograph the end of that too and any number stamped on it. That usually settles it immediately.

What happens next

Send the photo to us on WhatsApp. We'll come back to you with the pattern number and a link to the exact key. If the photo isn't clear enough we'll say so and tell you what to change — we'd rather ask twice than send you the wrong key.

If you'd rather not use WhatsApp, you can upload the photo through our key matching service page instead.

There's no charge for the identification and no obligation to buy. Plenty of people take the answer to a dealer instead, and that's fine.

When a photo won't be enough

Two situations where we'll tell you a key isn't the answer:

The nut is rounded or chewed. If someone has already been at it with a removal socket or the wrong key, the pattern may be damaged past the point where a correct key will grip. At that stage you need removal, not a key, and we'll say so rather than take your money.

The nut is seized or badly corroded. On older cars the outer sleeve of a locking nut can rust and spin freely on the body of the nut. The key still fits — it just turns nothing. That's also a removal job.

Both are covered in our guide on removing a locking wheel nut without the key.

Why bother with the photo at all

Because the alternative is expensive. Professional removal runs £40–£85 in the UK depending on how many wheels and whether a mobile van has to come to you, and afterwards you still need a new set of nuts. A correct key is £16.96 to £35 with free UK delivery on Royal Mail Tracked 24.

Two minutes with your phone is worth it.

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