3 minutes ago, TomsFocus said:

But the 5 spoke steels were designed for use with alloy nuts.

Then I suppose it comes down to whether the 5 spoke steel wheels are before or after 2013.

Purely on a personal level I'd not use the two piece nut on steel wheels. However if the 5 spoke steel wheel was designed to be used with the alloy nuts then it should in theory be fine provided the are torqued up correctly.  

Just now, unofix said:

Then I suppose it comes down to whether the 5 spoke steel wheels are before or after 2013.

Purely on a personal level I'd not use the two piece nut on steel wheels. However if the 5 spoke steel wheel was designed to be used with the alloy nuts then it should in theory be fine provided the are torqued up correctly.  

Yes, true.  I've been assuming that the wheels in question were from a Mk2 Focus or Mk1 C-Max but they did fit them to Mk3.5 Focus as well.  No idea why as they're still not fooling anyone!  

I would also feel more comfortable using one-piece nuts on alloys, space saver and 5-spoke steels of this age.

Thanks for the replies.

Has anyone ever tried contacting Ford's Engineering department for any questions like this?

Would they respond?

8 hours ago, AntonovAN12 said:

 

Has anyone ever tried contacting Ford's Engineering department for any questions like this?

Don't you trust our own in house panel of experts then?

14 hours ago, StephenFord said:

Don't you trust our own in house panel of experts then?

It's not that I don't trust the opinions here, I just wondered if anyone had tried it, and if they would respond. This is for any question, not just about wheel nuts.

With the equipment I deal with at work, a question like that would have to be answered in writing by the manufacturer.

I tried to obtain technical information on current models from both Ford and VW a few years ago and they were both utterly useless.  Not sure whether they'd be any better with an older model, or if they even know the Mk2 existed...

You've got nothing to lose by asking them though.  (Except the cost of the call, your time, and the will to live when they come back with a generic nonsensical answer that's completely irrelevant to your query.  )

I suspect they'll just check the same parts catalogues that we can check through catcar & 7zap.  Unfortunately, the catalogues are contradictory - I've seen reference to 3 different types of nut used with different models on the 5 spoke steels, although interestingly, can't find any of them using the 2 piece nuts.