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How much torque does it take to break a standard wheel stud?

I know most are at least grade 10.9, and 12x1.5mm threads. I tried getting a new stud and using an impact in a vice and couldnt get it to snap no matter how much torque I put on the nut. Does anyone have any idea what the max torque can put on these?

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  • Cars & Trucks Master
  • 48,191 Answers

It is tension that breaks a bolt not torque
you would have to put the stud through a piece of metal and make the nut stretch the bolt to make it snap and measure that required torque
the torque will be in excess of 100ft/lb

Posted on Aug 12, 2017

Testimonial: "I used an impact rated at 240ft/lbs and the lug nuts were mostly undamaged. No matter how much I tried to crank it, it wouldnt snap. I actually went pass the threads and it barely even stripped the bolt."

  • Bill Boyd Aug 12, 2017

    well you did the test wrong
    as mentioned it is a test of the tensile strength and that will not happen if you run out of thread
    you need to physically stretch the stub as it would be on a hub and wheel
    the major reason for studs to break is a sideways action as with a loose or bent rim



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SOURCE: Broken lug stud on rear wheel.

It appears from the excellent picture that the stud has to be spun to line up the half moons at the rear of the stud.Use two thin nuts locked together so you can spin the remaining stud to line up with reliefs in back of the retainer.

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SOURCE: Torque specs for front wheel hub nut

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SOURCE: Torque setings

if it is a solid bearing do it up as tight as you can.if it is a tapered bearing do it up untill the nut is touching the bearing check the hub for play if you have got play do the nut up a bit more until the play is gone in the hub.make sure you do not over tighten the bearing or the wheel will not turn freely.the wheel needs to spin with no drag.

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SOURCE: Front wheel stud replacement for a 2006 Hyundai Sonata GL.

grind a flat spot on the round head of the new stud this should give enough clearance to install it. don't pull the hub this will damage the bearing.

Posted on Oct 24, 2009

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