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Need drill size

cyclic

cyclic

1/2 ton status
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I'm doing a little custom work on the front of my 88 Burb. I need to know what size to drill the front 10 bolt 6 lug hub holes to install 14x1.5 lug bolts from a late model chevy (I think they are the same from 99-07). I will also be installing the 14x1.5 in the rear eventually.

I'll post some killer pics and info once I actually get the front done. I've got about 1/2 the parts needed, just a couple more weeks till I can get the rest. I don't want to reveal too much, but this will be bad ass.
 
What is the knurl size for the studs? That's the critical measurement. That, along with which part the knurl is going to bite into, the hub, the rotor, or both?
 
I want to use stock Silverado 99-07 front studs, they will only be installed into the hub.
 
w.r.t. drill size, lemme teach you to fish. Look up the lugs on, say, Dorman's site...

http://www.dormanproducts.com/p-811...rado 1500&parttype=Wheel Stud/Bolt&origin=YMM

That's a guess based on your description, so double-check that's the right one. I see they're the 14x1.5mm thread anyway.

The specs page for this part says knurl diameter is 0.6232". Subtract a few thousandths for the press fit and the closest bit I can think of is 39/64" (.609") which is a bit small, but the next size up is 5/8" which is too big (.625").

In metric you'd want like a 15.5mm drill which I doubt you'd find.

Now, for the shoulder size and fitment in general, you're on your own, but again, the Dorman site has dimensions and pictures and everything you need to DIY.

-- A
 
Sweet, thanks. I normally just try and check specs on Rockauto. Used to be I had a friend at autozone who would give me the prior years actual hard books so I could look up exactly what I wanted. Of all the things I've done, I've never changed lug size.
 
couple thousands press is good, you can use a 39/64 and then buy a reamer that is like .621ish
 
Doesn't look like they will work.

http://www.dormanproducts.com/itemdetail.aspx?ProductID=8116&SEName=610-428
vs
http://www.dormanproducts.com/itemdetail.aspx?ProductID=32671&SEName=610-179

You would be trying to hold the lugs with the rotors, not the hub, and you would rely solely on clamping force to keep the hub and rotor from rotating against each other, which I'm pretty sure wouldn't work for long.

Guessing (the specs are out there, I think I made a post with the stock 1/2 ton 4WD stud dimensions) that the hole in the rotor might be too big for the IFS knurl anyways, as you can see the prounounced shoulder.

I was only able to find one other stud that was even close to working, and it was a late 60's chrysler application that is 1/2".
 
dyeager535 said:
Doesn't look like they will work.

http://www.dormanproducts.com/itemdetail.aspx?ProductID=8116&SEName=610-428
vs
http://www.dormanproducts.com/itemdetail.aspx?ProductID=32671&SEName=610-179

You would be trying to hold the lugs with the rotors, not the hub, and you would rely solely on clamping force to keep the hub and rotor from rotating against each other, which I'm pretty sure wouldn't work for long.

Guessing (the specs are out there, I think I made a post with the stock 1/2 ton 4WD stud dimensions) that the hole in the rotor might be too big for the IFS knurl anyways, as you can see the prounounced shoulder.

I was only able to find one other stud that was even close to working, and it was a late 60's chrysler application that is 1/2".
Click to expand...

Nope, the 99-07 ones are the exact ones I want and need. A bit of custom work, trust me, EVERYONES jaw will drop. HINT-The lugs need to only attach to the hub, the rotor is no longer there.


ETA: I think I might have found a slightly better one to go with. A 98 Chevy 4x4 front stud. 610-327 14x1.5 0.6299 knurl which means I can use a standard 5/8 drill and I'm good to go.
 
Last edited:
Hmm. No brakes on the outers, so you're either doing a disc on the pumpkin a la Rockwells, or maybe inboarded on portals like a Unimog or HMMWV.

Or you've done away with brakes entirely and just put your foot down like Barney Rubble? :haha:

-- A
 
Ask my wife, I'm horrible at keeping secrets. But, I think I can hold this one till I do the full job. Took me 6 months to track down the info, another to get the main parts. And a couple more weeks till I get final parts and rip up the front of my truck. That's the plan anyway. Might go a little slower if I decide to get stuff powder coated.
 
cyclic said:
Nope, the 99-07 ones are the exact ones I want and need. A bit of custom work, trust me, EVERYONES jaw will drop. HINT-The lugs need to only attach to the hub, the rotor is no longer there.


ETA: I think I might have found a slightly better one to go with. A 98 Chevy 4x4 front stud. 610-327 14x1.5 0.6299 knurl which means I can use a standard 5/8 drill and I'm good to go.
Click to expand...

If you want that stud to stay put in the hub without spinning you'll want about .010" crush, basically a .619" hole for a .6299" knurl diameter.
 
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