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Wheel Nuts

Post by CF-y? » Sun Mar 08, 2020 12:46 pm
Joined: Tue Mar 26, 2019 9:24 pm
Posts: 29
A question in 2 parts!
Part 1.
Can anyone tell me (with 100% certainty) the seating angle on CF facelift wheel nuts? I had assumed it would be 60 degrees like most modern vehicles but when I examined one it looks more like 45 degrees. When I tried to measure the angle it definitely isn’t 45 degrees. Is it supposed to be conical? - mine are so badly grooved it’s hard to tell.

Part 2. If retro fitting alloy wheels are there any special requirements regarding the nuts I should use? (obviously I’ll ensure they match the seating angle of the alloy wheels in question - hence my question about the standard CF wheel nuts).

Thanks in advance.

Re: Wheel Nuts

Post by CF-y? » Sun Mar 08, 2020 1:12 pm
Joined: Tue Mar 26, 2019 9:24 pm
Posts: 29
Sorry, but just another thought on the matter after looking at a wheel nut again - are they supposed to have a ball/spherical/radius seating?

Re: Wheel Nuts

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Post by Phil Bradshaw » Club admin » Sun Mar 08, 2020 2:42 pm
Joined: Sun Sep 02, 2012 7:15 pm
Posts: 4550
By measurement undamaged 1016718 wheel nuts (7/16"-20 UNF, 3/4" hexagon) for 5-stud wheels 1969-87 have a 60° conical face and are 9/16" deep.

Dorman 611-014 seem to be a match.

Worn wheel nuts indicates over-tightening and, or, wheels run loose at some time.

If new nuts bottom against the brake drum (or hub flange CF2 front only) for any wheel then that wheel is scrap as well.
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  • What is real is not the appearance but the idea, the essence of things. Constantin Brâncuși

Re: Wheel Nuts

Post by CF-y? » Sun Mar 08, 2020 3:29 pm
Joined: Tue Mar 26, 2019 9:24 pm
Posts: 29
Really! 60 degrees? Mine really must be in bad shape! I’m about to have someone CNC machine a set of wheel adapters for me and I need to give him an exact and detailed specification hence I needed to know what the existing nuts are if I was going to re-use them to bolt the adapters to the hubs.
Thanks Phil - appreciate your help. If you’ve any other advice on the matter Id be happy to hear it.

Re: Wheel Nuts

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Post by Phil Bradshaw » Club admin » Sun Mar 08, 2020 3:51 pm
Joined: Sun Sep 02, 2012 7:15 pm
Posts: 4550
If the adaptors are thick enough for deep countersinks then 7/16" UNF acorn bulge nuts (e.g. Ford Escort mk 1, mk 2) could be an answer.
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  • What is real is not the appearance but the idea, the essence of things. Constantin Brâncuși

Re: Wheel Nuts

Post by CF-y? » Sun Mar 08, 2020 7:05 pm
Joined: Tue Mar 26, 2019 9:24 pm
Posts: 29
Was trying to keep the thickness to a minimum Phil. Hoping to get away with 30mm thickness. Most alloy wheels I’ve seen tend to have approx 10mm thickness of flat metal before the start of the taper so I’m assuming adapters should also be machined in a similar fashion - so that leaves me with a max nut depth of not more than 20mm. Any more than 30mm is likely to require wheel arch extensions - depending of course on rim width and offset. By any chance do you know the offset of a standard steel rim?

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Post by Phil Bradshaw » Club admin » Sun Mar 08, 2020 7:50 pm
Joined: Sun Sep 02, 2012 7:15 pm
Posts: 4550
Blank on wheel offset - not something I've ever seen written in GM publications.

If I get chance (i.e. weather not too evil!) then I'll see if I can dig out a rim from the spares pile out back and apply a tape measure.
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  • What is real is not the appearance but the idea, the essence of things. Constantin Brâncuși

Re: Wheel Nuts

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Post by Phil Bradshaw » Club admin » Fri Mar 13, 2020 1:44 pm
Joined: Sun Sep 02, 2012 7:15 pm
Posts: 4550
For a 5-stud 14-inch wheel the offset is 125mm (4.92 inch) from the rim rear edge.
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  • What is real is not the appearance but the idea, the essence of things. Constantin Brâncuși

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