7mm Spacers; do you need longer nuts?
10-26-2004, 11:48 PM
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7mm Spacers; do you need longer nuts?
Hi All
After some recent suspension mods, I now have room to widen my rear track with 7mm spacers.
Will I need longer wheel nuts than the standard ones I have now? Is there a 'legal' requirement for thread length?
Cheers IA
James
After some recent suspension mods, I now have room to widen my rear track with 7mm spacers.
Will I need longer wheel nuts than the standard ones I have now? Is there a 'legal' requirement for thread length?
Cheers IA
James
10-27-2004, 12:19 AM
#3
The general rule on any bolt in steel is depth should equal diameter. A stud threaded into aluminum usually reaches max strength at 1.5times diameter. So a 14mm stud should extend into the lug 14mm with a steel nut and some 21mm into an aluminum nut to optimize strength. I'm not an engineer, but this is the rule in some sanctioning bodies that I've been involved.
Some have used the idea of a given number of turns. I think many have said that 8-10 rull turns before torque is reached might be sufficient. I tend to go by the above rule. Some tech inspectors will simply require an open lug of appropriate thickness and that the stud reaches flush with this lug nut.
Some have used the idea of a given number of turns. I think many have said that 8-10 rull turns before torque is reached might be sufficient. I tend to go by the above rule. Some tech inspectors will simply require an open lug of appropriate thickness and that the stud reaches flush with this lug nut.
10-27-2004, 12:54 PM
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] [ <-------7MM or approx. 1/4 inch
you would need longer studs not nuts which are no fun to DIY, but for 7MM just count the turns, I forget the pitch on wheel studs but I think its 1MM per turn, which maens 10 turns is 10MM of thread used.
you would need longer studs not nuts which are no fun to DIY, but for 7MM just count the turns, I forget the pitch on wheel studs but I think its 1MM per turn, which maens 10 turns is 10MM of thread used.
10-27-2004, 11:57 PM
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Thanks Guys
You are right, I have bolts not nuts!
The bolts are the standard factory items so with 7mm (1/4in) shims the bolts should be long enough?
Cheers
James
You are right, I have bolts not nuts!
The bolts are the standard factory items so with 7mm (1/4in) shims the bolts should be long enough?
Cheers
James
10-28-2004, 07:06 PM
#6
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Standard factory wheel studs are 45mm. Adding spacers much above 3mm should probably have longer studs. Pelican has 52mm studs @ 10 for around $45. They aren't hard to change out, you'll need a couple of extra steel lug nuts that you'll ruin in the process. Basically, bang 'em out, push the new one in, and use a steel nut against some hardened washers (which bridge the gap where there are no threads) to pull the stud into place.
10-28-2004, 07:38 PM
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As Bill said, they are not difficult to change out, but be very careful "banging" studs out of a hub. The preferred method is pressing them out. The rate of difficulty is dependent on the interference dimension between the stud spline diameter and bore diameter of stud hole. Attempting a "on vehicle" stud change, I have been relatively successful using an industrial "C" clamp with a socket on the back side.
Good luck!
Kevin - Dallas
Good luck!
Kevin - Dallas
