Locking wheel bolts and the removal keys that fit them look simple, but the detail underneath is anything but. Dozens of manufacturers, hundreds of internal spline and pin patterns, and separate part-number systems in the UK, Europe, and North America mean a “near enough” key is often worse than no key at all. This guide brings together everything we use day to day when matching keys for customers - terminology, brands, pattern types, OE cross-reference, photo matching, and what to do when the key is missing.

Bolt, key, and nut - what each word means

Customers often use “locking nut”, “wheel bolt key”, and “anti-theft key” interchangeably. In practice:

• Locking wheel bolt (or nut) - the fastener that stays on the wheel. One wheel usually has one locking bolt among four or five standard ones. The security feature is in the head profile - spline, pin, rotating collar, or similar - not in a separate padlock.
• Removal key (socket / tool) - the small adapter that fits that profile. It looks like a short socket and lives in the glovebox, tool kit, or with the spare wheel. This is what you order when the key is lost but the bolts are fine.
• Anti-theft key (shop category name) - on our site, this means the removal tool matched to a security bolt profile - not a car ignition key.

Bolts are sold in sets with a new key; keys alone are sold when you still have good bolts and only need the tool. Mixing them up is the most common reason for a wrong order.

Who makes locking wheel hardware

Factory locking bolts on European and UK-market cars usually come from a small group of specialist suppliers. Aftermarket replacements may use the same supplier or a compatible pattern from another brand.

McGard

McGard is one of the largest OEM suppliers worldwide. BMW, Mercedes-Benz, Audi, Volkswagen, Ford, Jaguar Land Rover, and many others have used McGard patterns at various times. McGard assigns each pattern a numeric code (often printed on the key or listed in owner documentation). Replacement keys are cut to that code - there is no single “McGard master key”. Codes are typically eight to eighteen digits depending on era and vehicle.

Farad and other aftermarket brands

Farad (Italy) is widely sold in Europe as an aftermarket locking bolt set. Profiles are branded and numbered separately from McGard. A Farad spline set on a BMW is not automatically the same as a factory BMW spline - always match by pattern, not by car badge alone.

Factory-branded sets

Some marques supply bolts keyed only to their dealer network (early Mercedes, certain BMW packages). The physical pattern may still trace back to McGard or an equivalent, but the part number on the box is an OE number. Dealers look up by VIN; we match by profile photograph or by cross-referencing the code stamped on an existing key.

Budget universal sets

Generic multi-spline kits sold online share one adapter with several interchangeable inserts. They are intended for emergency use on unknown patterns, not as a permanent replacement for a factory key. See the section on universal keys below - we do not recommend forcing these onto a stuck factory bolt.

Pattern types and how they differ

Security is created by a non-standard interface between the key and the bolt head. Common families include:

Spline (star) profiles

Internal splines look like a gear inside the bolt head. BMW and MINI are the best-known example - but “BMW spline” is not one pattern. Early cars used coarser splines; later models moved to finer counts and different diameters. Audi and Volkswagen use their own spline families (often grouped as “VAG spline” in the trade). Land Rover and Jaguar frequently use spline or hybrid heads depending on year and wheel type.

Pin-in-hole and rotating collar

Some Mercedes-Benz and older European bolts use a pin that must align with a hole in the key, or a rotating outer ring that turns freely until the correct key engages the inner drive. These defeat ordinary hex sockets and require exact key geometry.

Heptagon, tulip, and bulbous heads

Several Japanese and Korean marques, plus some Ford and Vauxhall applications, use seven-sided or tulip-shaped heads with fine tolerances. They resemble standard nuts from a distance but will not accept a ring spanner.

Seat type and thread - often confused with the pattern

Ball seat vs tapered seat vs flat seat (and M12 x 1.25 vs M14 x 1.5 thread) determine whether a bolt physically fits the wheel - separate from the security pattern. When changing aftermarket wheels, you may need new bolts for seat and length even if the security pattern stays the same.

OE numbers, McGard codes, and cross-reference

There is no single global database linking every car to one key SKU. Instead, several reference systems overlap:

• OE (original equipment) part numbers - BMW examples include 36 11 6 788 899 and 36 11 6 788 905 (exact number varies by model year and package). Mercedes-Benz often uses A000990 XXXX or A000990 XXXX format for bolt sets. Audi/VW may show 4F0 615 417 or similar in ETKA. These numbers identify a kit (bolts + key), not always the key alone.
• McGard security code - If your original key or pouch shows an eight- to eighteen-digit McGard code, that code maps to one pattern. We can often supply from the code; a photo still helps confirm wear or aftermarket substitution.
• Aftermarket cross-reference - Suppliers publish charts linking McGard codes to their own SKU. Two listings with different titles may be the same pattern - or subtly different splines with the same marketing name. That is why we prefer profile matching over title matching.
• eBay / listing part numbers - Our listings and eBay range use internal profile names (e.g. BMW/MINI Spline, Audi/VW Spline) aligned to the physical key we stock. If your OE number is not in the title, send a photo rather than guessing from year alone.

Cross-reference tables are useful starting points, not proof. A previous owner may have fitted aftermarket bolts with a different pattern than the factory build sheet suggests.

UK-spec vs import / international cars

Right-hand drive vs left-hand drive does not change the bolt pattern - the security head is the same whether the wheel is on the left or right side of the car. What does matter:

• Import cars may have had wheels changed in another country before arriving in the UK, including non-OEM locking bolts.
• US-market and EU-market part numbers for the same model name sometimes differ (different wheel packages, McGard code batches, or supplier contracts).
• Japanese domestic market (JDM) vehicles occasionally use different thread or seat specifications when fitted with UK aftermarket wheels.
• Registration lookup helps for TPMS and some OE bolts, but for locking keys a photo of the actual bolt head or existing key remains the reliable method.

If you bought the car in the UK but it was first registered abroad, treat the hardware on the wheel as the source of truth - not the badge or the registration country alone.

Locking bolt profiles by car brand

Marque means the car manufacturer (BMW, Mercedes, Ford, and so on). This table is a quick reference for which type of locking bolt profile each brand tends to use - not a guarantee for every model year. Winter wheel packages, AMG or M-Sport wheels, and aftermarket alloys often use a different pattern from the base car, so always match from a photo when you can.

Marque	Typical pattern family	Notes
BMW / MINI	Internal spline (multiple counts)	Most common enquiry we see. M-Sport and winter wheel packages may differ from base models.
Mercedes-Benz	Pin / rotating collar / spline depending on era	AMG and multi-spoke wheels often have specific kit numbers.
Audi / VW / Skoda / SEAT	VAG spline variants	Shared platforms do not always share the same locking head.
Land Rover / Jaguar	Spline and proprietary heads	Aftermarket alloys frequently introduce non-OEM bolts.
Ford / Vauxhall / Stellantis	Mixed - often McGard OEM codes	Check for Farad or other aftermarket sets on used cars.
Toyota / Lexus / Nissan / Honda	Heptagon, tulip, or spline	Import models may differ from UK dealer-supplied kits.

Browse keys by profile in our anti-theft keys category - organised by pattern, not only by car name.

Photo matching at Automotive Outlet

Because pattern names and OE numbers do not always tell the full story, we offer profile matching from a photograph - the same process we use for eBay customers.

What to photograph

• The locking bolt head straight on, filling most of the frame
• Good daylight or bright garage light - avoid deep shadow inside the spline
• If you still have the key, photograph the key end and any code on the pouch
• One bolt is enough; note which wheel it is on if some bolts look different (mixed sets)

What to avoid

• Blurry photos from too far away
• Heavy filters or flash glare that hides the internal shape
• Photographing a standard hex bolt instead of the locking one

We compare your image against our reference library of profiles we stock. You receive confirmation of the correct listing before checkout, which avoids returns and delays at the tyre shop.

Lost your key - sensible next steps

1. Search the glovebox, boot tool tray, under-seat storage, and with the spare wheel - keys are often a black socket in a small plastic pouch.
2. Check whether a second key came with winter wheels or a previous owner’s paperwork.
3. Do not let a garage “try” a universal kit on tight bolts - rounding the head turns a key order into a bolt extraction job.
4. Photograph the locking bolt and contact us or order through the matched listing we confirm.
5. Order the key before booking tyre or MOT work that requires wheel removal.

Why universal key sets fail

Universal kits rely on approximate fit. Factory profiles are machined to tight tolerance; a slightly wrong spline will slip under torque and chew the head. Professional tyre bays increasingly refuse to use universals for that reason. The cost of one correct key is usually far less than extraction, new bolts, and labour.

Anti-theft keys cost more than a standard blank because they are low-volume, profile-specific, and matched - not because they contain exotic materials. You are paying for certainty.

Replace bolts or order a key only?

Order a key only when

• Bolt heads are intact and you simply lost the tool
• You want a spare for a second set of wheels using the same bolts

Replace the bolt set when

• Heads are rounded, corroded, or previously damaged by the wrong tool
• Threads are worn or you are changing wheel seat type / length
• The car has a mix of unknown bolts and you want a matched set with a new key

See anti-theft bolts for replacement sets; most include a new key in the box.

How to order from Automotive Outlet

1. Find your bolt or key in the shop, or send a photo if unsure.
2. We confirm the profile (same day in most cases during business hours).
3. Add the matched item to basket and checkout - UK dispatch, same quality range as our eBay store.

FAQ

Can you cut a key from my registration alone?

Sometimes, for standard OE packages - but we still prefer a photo because wheels may have been changed.

Are all BMW splines the same?

No. Multiple spline diameters and counts exist across 1 Series through X models and MINI.

My McGard code is worn off - am I stuck?

Usually not. A clear photo of the bolt head is enough for matching in most cases.

Will a dealer key always work?

Only if the bolts are still the factory set that matches that OE number. Aftermarket bolts need aftermarket-matched keys.

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