In the process of a nightmare fitting longer wheel studs ,,, Bought a set of 7/16 UNF thread and 13.1 spline studs and the rear ones fit fine ,,,,front ones no chance ,,,,, Advised I need the larger 14.3 spline ,,needless to say they wont fit either,,to big ,,, best leave it for now before I hit the bloody thing with something heavy ,,
Neil Fletcher Standard Mk2 studs have the same spline as a Mk1 stud and they are the same length - the thread is the main difference in that the 12 mm metric thread is very slightly coarser than the Mk1 7/16 UNF thread but you need to look closely to tell. In actual fact it was so easy to mix them up that Ford put a special mark a bit like a screwdriver slot in the end of a Mk2 stud so people could tell the difference. Those are not normal Mk2 studs.
I'd not be an expert on later 80s stuff but I think that cars like Sierras and such like from that era had a metric stud with a bigger spline. I have heard tell of guys whose Mk2s damaged the normal splines drilling them out slightly and fitting the later metric stud - maybe........just maybe that's what those are but I'dnot be sure!
Sean Kukula There's two sizes of spline on the M12 studs, 13.1mm and 14.3mm diameter
Sean Kukula As far as I'm aware there were only 2 threads used 7/16 UNF and M12x1.5
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