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12mm lug stud conversion
Topic Started: Oct 24 2012, 01:32 PM (1,322 Views)
mauurgp
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absolutely fresh fish

okay;
so im sure that this has already been written up, but i havent found it yet, and am in the middle of the conversion.

im presuming i can just bore out the holes in my 10mm brake drums to accommodate the 12mm's?

having read a few threads, i got the impression (probably just misread) that you could just press in the 12mms in the same holes. i figured the 10mm studs must have been tapered down to the threads or something like that; but the 12 obviously dont fit the holes.

what diameter hole do i use to bore out the holes?

thanks;
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snowfish
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Basic GearHead

The hub & drums will need to be drilled. The 12mm will not fit in the 10mm hole. :shake

No such thing as "just" boring the holes. :smackface A lot of material will need to be removed. :gamerz Drill press would be highly recommended.

Comparison of 10mm vs 12mm

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If I had to do it again, I'd spring for a true 12mm drill bit. ^o) As you can see by this chart, :news

http://bobmay.astronomy.net/misc/drillchart.htm

there is no exact match SAE bit. :smackface If I recall, I used the 15/32, in a drill press, and then Carefully reamed a little with a hand drill. Press in the stud & seated with an impact.

Take your time. Drill slow and use lots of cutting oil.

On my pending 91 project, I'm using 95 knuckles, hubs, & drums. Disc rotors are larger and the 12mm studs are already present. :cheers

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mauurgp
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absolutely fresh fish

thank you snowfish. good post - quite informative.
i will have to see if i have a 12mm as well.
that puts me well on my way - thanks;
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mjspiess
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If you need 12mm studs, I can ship you a set of 16 for $20 shipped. Just let me know.
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mauurgp
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absolutely fresh fish

thanks, mj. i had already purchased them through rockauto.
tomorrow i will see if i can drill out the holes and press in the 12mm's.
i will probably need to wait until my next 'weekend' to do the fronts.
thanks;
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snowfish
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Basic GearHead

Some action shots would be great. :popcorn
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mauurgp
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absolutely fresh fish

snowfish; unfortunately im not good at 'preserving a record' of what i do; but i did get a couple pics of a quick 'shop press' i had to build to do this.
turns out, 12mm bits are hard to find - i couldnt just waltz into hd/ace/osh/sears and get it. so, i just used 15/32 like you. usually i just press in studs with large c-clamp; but because of the undersize of the hole - that was not happening.
so, instead, the pics below:

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rear wheels are on; need to get pics.
next weekend (my weekend - wednesday/thursday); hopefully, the front go on.
thanks again for the help;
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snowfish
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Basic GearHead

Wow! :O Now That's a Press! :thumb Great work! Glad it's working out. :cheers
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mauurgp
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absolutely fresh fish

me too.
thanks, snowfish;
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