Open ended car wheel nuts, what are they used for?

Open head wheel nuts set of 20

There are times when you may find that an open ended alloy wheel nut is useful. These car wheel nuts are similar to the standard closed head nuts, but they allow the wheel hub stud to go all the way through the nut. There are cases where the wheel studs are too long for closed head nuts and the stud will top out before nuts can be fully tightened.

examples of this are if extended studs have been fitted to allow a wheel spacer or some steel wheels and space savers need an open head nut to fit. Another common use for open head car alloy wheel nuts is if the centre cap cover the nut holes. In this instance it is often the case that a closed head wheel nut is too tall and stop the cap fitting correctly. The open head nuts are shorter and fit perfectly under the centre caps.

Can I use open head nuts on alloy wheels?

Yes, these open head nuts have a standard 60 degree taper so will fit many alloy wheels. These are commonly used with Ford Transit Custom and MK8 vans as these have longer than usual hub studs. See our M14 x 1.5 21mm Hex open head nuts which are ideal for these van.

The 19mm hex M12 x 1.5 fitment open head nuts are ideal for Most Ford alloy wheels and steel wheels.

Do you need special nuts for alloy wheels?

Nuts and bolts are used to fasten wheels to the car and are arguably one of the most important parts on a car and usually overlooked.

Alloy wheels do use specific nuts and bolts depending on the manufacturer of your car or if you have purchased aftermarket alloys for your car.

The most common things for you to check when buying a new set of alloy wheel nuts or bolts is the thread size and seat type.

Common thread sizes

Most cars are measured in mm (metric) where the M number is the thread width and the small number is the pitch.

M12 x 1.5

M12 x 1.25

M14 x 1.5

M14 x 1.25

Common Seat Types

The seat refers to the section of the nut or bolt that makes contact with the wheel. This is very important as there must be sufficient surface contact to ensure correct fitment.

Taper (60 degree)



How do I know what nuts or bolts I need for my car wheels?

If you are not sure which wheel nuts and bolts you need then you can use our simple search on the home page or at the top of the page in the menu bar. Simply type your car model and our system will give you the correct fitment nuts or bolts.

If you are still unsure then you maybe able to find the thread size in your owner’s manual, if not then a quick search online should provide the information. When it comes to the seat type the easiest way is to look at one of your existing nuts or bolts, if the section directly under the head is a cone shape then you will need a taper seat. If the shape is curved more like a bowl then you will need radius seat and probably the most obvious is if your nuts or bolts have a flat washer then you need flat seat.

Common taper seat fitment are: Alpha Romeo, BMW, Fiat, Ford, Renault, Saab, Vauxhall.

Common Radius seat fitment are: Audi, Mercedes, Seat, Skoda, VW

Common Flat seat fitment are: Citroen, Jaguar, Lexus, Peugeot, Toyota.

What are tuner nuts and bolts?

If you have purchased aftermarket alloy wheels for your car then you may find you have what is called multi fitment. This is where the wheels have more nut and bolts holes than usual. Most cars are either 4 or 5 stud, but multi fitment may have up to 10 holes.

To allow the extra nut and bolts holes on these aftermarket alloys they require slim / narrow nuts or bolts. This is where tuner nuts come in, they are round and usually 20mm in diameter. There is no hexagonal head and instead a splined key is fitted into the top of the nut or bolt to fit them.

Ford Focus wheel nuts size

What size alloy wheel nut do I need for a Ford Focus?

Well the technical Specification for a Ford Focus alloy wheel nut is
19mm Hex
60 degree taper / conical seat
M12 x 1.5 thread

However there is a small difference in what nuts you will need depending on whether you are fitting genuine Ford or aftermarket alloy wheels.

Genuine Ford Alloy wheels have a slightly wider than standard nut hole and you will need to buy nuts that have a seat diameter of 28mm, this is often accomplished via a captive washer.

Aftermarket alloy wheels generally have the more standard 23mm or 24mm wide nut holes, there are many nuts available for this size and they will be fixed seat (no washer). Some aftermarket wheels are designed to fit more than just one manufacturer of car and have a multi fitment PCD, this means they have either 8 or 10 nut holes. In this case you will need another style of alloy wheel nut altogether. Tuner or slim fit nuts are used with these multi fitment wheels.

Below are some options available to buy for Ford Focus wheel nuts.

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The Ford Focus wheel nuts above are for standard aftermarket alloy wheels and not the multi fitment style. Please check back soon for tuner slim fit nuts.

All the nuts sold by Spot On are made from high quality heat treated carbon steel tempered to 10.9 grade. The standard finish is zinc plating for durability.

Proton Alloy wheel fitment data

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The wheel nuts shown on this page will fit Proton cars.

These nuts are taper seat for alloy wheels.

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