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Old 23-09-2016   #1
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Exhaust Flange Nuts/Studs Size?

Ok so just replaced the complete exhaust system on my nieces 1.2 Punto Active (54 plate).
A simple job apart from where the system joins the down pipe flange. I was surprised to find the nuts were 12mm AF rather than the expected 13mm AF, plus when I went to replace the nuts with new ones I found the threads were not the standard 8x1.25mm.
So where do I get replacement nuts or do most people just drift out the spot welded studs & replace the whole lot with standard size (M8x1.25mm) bolts & nuts?
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Old 23-09-2016   #2
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Re: Exhaust Flange Nuts/Studs Size?

you are right about the nuts having a 12mm head but the thread is standard. m8 nuts from fasteners will fit. the studs are not welded in they just screw in too.
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Old 23-09-2016   #3
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Re: Exhaust Flange Nuts/Studs Size?

fine pitch quite common in cars (bear in mind that there are more than one thread pitch in ISO threads: coarse, fine, ....)

You can normally get them on ebay
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Old 24-09-2016   #4
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Re: Exhaust Flange Nuts/Studs Size?

Studs are spot welded on
A quick grind and they'll drop off / out

I stuck some nice high tensile stuff in afterwards

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Old 24-09-2016   #5
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Re: Exhaust Flange Nuts/Studs Size?

funnily enough, mine were loose fit
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Old 15-04-2017   #6
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Re: Exhaust Flange Nuts/Studs Size?

Hadn't realised I had not closed this thread off. In the end I simply knocked the old studs out & refitted some standard M8 bolts, nuts & washers. Exhaust was not only cheap (42 inc clamps & gaskets) & dead easy to fit. Beginning to like this little car as all the jobs seem so simple & as it fits nicely in my garage don't have to worry about the weather.
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