Wheel stud hole size

[anwat]

I'm installing some wheel studs in a 1/2 plate for a spare tire carrier. The knurled portion of the studs measures 5/8" I drilled the holes to 37/64, and I'm using a bottle jack to try to press the studs in, but I'm getting an lot of resistance. I think the holes need to be bigger. I'm using lubricant on the studs, but they just aren't going in. Any suggestions?

 

[Wes Harden]

wow you think a .00045 press fit wouldn't give a hydraulic jack any grief.
grease/oil the threads a couple of flat washers liberal lubed, lug nut on backwards and use an impact to draw them in. Maybe a wack or two on back side while uga duging.

edit my bad I have an extra zero in there. It's .040 yeah that's very tight. over a 1/16th of an inch. 39/64 will .016 should be doable then.

 

[76zimmer]

I get . 0468 difference, which isn't enough for a knurled shank.

Here ya go….

ARP | Wheel Stud Knurl Fit

 

[anwat]

Well, there you go....looks like I need to go buy a new bit and then chamfer the edges a little. $20 for a sixteenth of an inch is steep, but it isn't going to fit otherwise. Thanks!

 

[anwat]

In case someone else is faced with this question, the final answer was a 39/64 bit, still had to use the bottle jack to press them in, they are plenty tight. Just for the record, the bit was $32. And I'll bet I never use it again.

 

[imiceman44]

In case someone else is faced with this question, the final answer was a 39/64 bit, still had to use the bottle jack to press them in, they are plenty tight. Just for the record, the bit was $32. And I'll bet I never use it again.

I got a bit set in the cobalt variety the box of 100 bits was $120.
It has all sizes imaginable up to 1/2"
I haven't had any instance where I didn't have the right size.
1/64" increments from 1/2" down to 1/8" then smaller increments down barely can see it

 

[Wes Harden]

39/64 is larger than half. By 7/64s

 

[imiceman44]

39/64 is larger than half. By 7/64s

Oops, maybe mine is up to 9/16"
I need to double check.
Thanks for the comment

 

[Blue85]

I think the backup plan is to go up to the next bit you have (or is cheap), then weld the back of the stud to the plate. That wouldn't be OK on your wheel hub, but for a spare tire carrier would be good enough. If you need to replace it later, that's more of pain, of course.

 

[rampage]

Or you could try freezing the bolt and heating the hole trick.

 

[anwat]

if anyone ever needs to borrow it, let me know....at least it will drill more than 6 holes in it's lifetime!