Chevy rear axle shaft press stud to threaded? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 10-26-2019, 06:06 PM
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Chevy rear axle shaft press stud to threaded?

Hi

Im rebuilding my chevy 12 bolt rear. I want to upgrade the 7/16 press stud to 14x1.5 threaded studs. I drill the axle shaft to 12,5mm but I can`t tap the shaft. Any sugestion? the axle is to hard for the tap?

thanks

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Old 10-26-2019, 06:15 PM
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that is really hard to tap and to keep the hole straight, unless you have a mill with a tapping head.

Consider getting some press in studs.
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Old 10-27-2019, 08:58 AM
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This really should be done by a machine shop so that the bolt circle is correct and the holes are tapped straight.
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Old 10-27-2019, 11:44 AM
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You need a better tap and a lot of cutting fluid like Tap Magic or Rapid Tap.
The two fluted taps area best for this.
I redrilled something similar before by using a 2”od solid dowel with a 1/2” hole down the middle.
Use it as a tap guide. I thought about welding a tab on the bottom that would run across the flange to the opposite stud hole to further aid in use but I never did. It worked out okay until both rear axles broke in a unrelated tree stump incident.
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Old 10-27-2019, 12:17 PM
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You may need a Cobalt tap for this, which is made for tapping hard materials and hardened steels....in which case it might be just as cheap to pay a machine shop to do it....looking at probably $60+ for a Cobalt tap in Metric 14 x 1.5

Tap is listed at $65.90 at McMaster-Carr. For use on nickel and other hard materials.

Why metric 14 x 1.5??
1/2"-20 almost the exact same diameter, and the tap is almost half the cost of the metric crap.
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Old 10-27-2019, 12:24 PM
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Quote:
Originally Posted by ericnova72 View Post
Why metric 14 x 1.5??
1/2"-20 almost the exact same diameter, and the tap is almost half the cost of the metric crap.
Probably due to his location.
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Old 10-27-2019, 01:38 PM
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Quote:
Originally Posted by big gear head View Post
Probably due to his location.
Ahh, South America.....I missed that fact. Metric is surely easier to obtain down there!

But yeah, he is going to need a tap made specifically for hard materials.
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