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Join Date: May 2008
Posts: 722
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Wheel stud knurl diameter
I'm installing longer wheel studs I've bought the 52mm long ones from Pelican made by verbus. The ones removed from the hubs are marked NSF. Both the NSF and the new verbus studs have the same diameter at the knurl measuring 0.574" (14.58mm). Many years ago one stud was loose, I could push it in and out of the hub with my fingers, it took the hub to a machine shop and they ordered a larger knurl diameter stud its a verbus that measures 0.579" (14.70mm), 0.005" bigger. Of course that machine shop is on longer there. Any idea where to find these larger knurl diameter studs? I did call one machine shop he told to find the studs myself, I checked with napa but nothing that size.
I guess if I can't find the larger diameter stud I may try peening the hub to use the standard stud. By the way the 52mm long studs sold here measure 50mm. |
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06-22-2011, 03:41 PM
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Join Date: Jul 2001
Location: Portland Oregon
Posts: 7,007
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JMHO,.......
I've never seen larger diameter studs for the 911 and given the low cost of a good used set of hubs, I'd strongly recommend sourcing a pair of used ones instead of a "McGyver" solution that carries some very serious safety implications.
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Steve Weiner Rennsport Systems Portland Oregon (503) 244-0990 porsche@rennsportsystems.com www.rennsportsystems.com |
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06-22-2011, 04:14 PM
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Location: Adelaide South Australia
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Quote:
Please don't do this. A good used hub is worth about $60.00
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- Peter |
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06-22-2011, 04:34 PM
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The peening idea is not going to float.
A side question, how much stud through the wheel is needed, or how many turns of the lug nut? |
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06-22-2011, 05:17 PM
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Join Date: May 2004
Location: Boulder, Colorado
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Front or rear? If rear, perhaps you could have someone TIG the loose stud while bolted to a rim to make sure it is straight? But compared with the cost of a replacemt flange, where the main work is getting it off?
Front aluminum hubs? Used good ones would seem to be the way to go by far. There are a variety of rules for wheel nut engagement. The military requires that the stud protruce a half inch or something like that. More common is to require the stud to engage all of the threads. In racing, where open end steel lug nuts are required, that means the stud has to be at least flush with the nut end. The other rule of thumb is that the nut should engage threads for at least the diameter of the stud. Which means 14mm for our Porsches. How long the stud needs to be depends a lot on the rim. Some have quite thick centers, some have thick centers with the mounting hole counterbored into the rim center quite a bit (especially with cast rims). And then there is the question of the spacers you use (or don't use). |
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06-22-2011, 07:15 PM
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These are the front hubs.
With the old studs on fuchs at 45mm long, a steel lug nut will bolt up to the end of the lug. With a 8.5mm spacer the new lugs are 4mm short of the end of nut, the new lugs being shorter than advertised at 50mm instead of 52mm is causing a small problem. I have about 17mm engagement with the new lugs. The spacers I have don't look like they are top quality I may buy the 6.5mm onces sold here. |
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06-22-2011, 07:54 PM
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