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Is it cause the shops use those pneumatic tools to screw them on and they get overtightened?

either somebody crossthreaded them and you need to replace them, or overtightened them to the point that you explained and you still have to replace them. its not really that hard to do. just take the tire off, you may have to take the caliper and / or drums off the back, and just tap them out with a hammer. you probably have to hit em pretty hard. then stick the new stud through the hole and thread the bolt down on it untill it tightens all the way and your done.

also the wrong size nut could be on the stud, but again would still reqire replacement.

8 Responses

1. Angela L Says:
   November 29th, 2009 at 9:21 am

   It could be your wheel bearings, or your tires are out of balance?
   References :

2. gdwrnch40 Says:
   November 29th, 2009 at 9:50 am

   Yes,impacts will cause that problem.
   References :

3. amsoil dealer Says:
   November 29th, 2009 at 10:26 am

   either somebody crossthreaded them and you need to replace them, or overtightened them to the point that you explained and you still have to replace them. its not really that hard to do. just take the tire off, you may have to take the caliper and / or drums off the back, and just tap them out with a hammer. you probably have to hit em pretty hard. then stick the new stud through the hole and thread the bolt down on it untill it tightens all the way and your done.

   also the wrong size nut could be on the stud, but again would still reqire replacement.
   References :
   ase mechanic 3 years.
   army mechanic 4 years

4. doug955 Says:
   November 29th, 2009 at 10:41 am

   not sure why the studs are breaking unless that shop you still take the car to is tightening them an ungodly amount.A good shop will use the impact to just run the lugs up against the rim and then USE a torque wrench(100ft.lbs is a good rule of thumb)to finish the job.If they arent doing this find another shop
   References :

5. Mafia247 Says:
   November 29th, 2009 at 11:14 am

   doug955 is 100% right

   If your unsure go to your local walmart ask them to check the tork on your lugnuts they can tell you how much pressure they are on @ and yes 100 foot pounds is a good rule of thumb to use on any vehical.
   References :

6. gregthomasparke Says:
   November 29th, 2009 at 11:26 am

   I work in a garage, I have never had a problem with having studs breaking. Even with the air tools being used. The only time they will break is if they have been cross threaded, or if the nut or stud has been damaged, or if they are not he same threads. Over tightening will cause the stud to stretch the threads and will cause the nut to be tight coming off. I see maybe 1 or 2 borken studs a month. and concidering i work on approxamatly 4 cars a day (where I have to take the tires off), 6 days a week at work, and constantly taking tires on and off (I work as a brake tech, and then if there is no brake work, I am a general technician), The times that the nuts do snap are the times when the impact gun will not thread it off, and a breaker bar is needed because they have been cross threaded (strong arm, L – handle, for a few more names for a breaker bar). When tightening wheels, the wheels should be firmly planted on the ground with the wheel nuts snugged up, and then the nuts should be tightened to the proper torque spec using a torque wrench. If torque sticks (used on impact guns as an inaccurate torque stick(*1), gets it close to the alotted value) are being used, then the gun should be on high pressure, and the proper torque stick is to be used.

   Wheel nuts just don’t break. They break for a reason. Cross threading, over tighening (to the point where the threads are stretching, usually caused by an impact gun on full force WITHOUT a torque stick being used, or by a breaker bar doing the same), wrong thread matching, or wrong wheel nuts. Find out why they are breaking, and then go from there and diagnose why its happening.

   (*1) – A torque stick is an extention added between the impact gun and the socket. It is spring tentioned and with the impact gun on full power, the sping will get to the preset tention and will no allow the socket any more pressure on the nut. It is not a 100% accurate way, but it comes very close. It dependons on the gun being used. The end torque value will very depending on the quality and strenght of the impact gun being used. A torque stick may allow the nut to be over tightened a little bit, but nothing that will hinder the nut from coming off, unless an improper torque stick was being used (say one rated for 160ft/lb being used on a vehicle with wheel nuts rated at 50ft/lb)
   References :
   Automotive apprentice with 2 years shop experiance

7. studmuffin Says:
   November 29th, 2009 at 11:47 am

   yea, i found out that some tire shops set their impact wrenches up to high and when you try to get them off,sometimes they snap.do like i do,i ask them to put them on with a tire wrench.
   References :

8. audicoupefreak Says:
   November 29th, 2009 at 11:53 am

   the only vehicles ive seen consistently break studs on were isuzu troopers. Maybe you just have worn out nuts. I’ve seen that happen once or twice.
   References :
   mechanic for 8 years

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