AO Silver Member
Join Date: Mar 2003
Re: Why wheel bolts rather than studs?
As has been suggested male threads are more likely to be damaged....this is applied throughout the car and for quality and protection reasons. Component suppliers have to supply parts that have separate bolts or screws rather than fixed studs that take nuts. Moving the parts around, handling them or dropping them before they are assembled to the vehicle causes damage in a percentage of cases. For a car manufacturer this gets very expensive when your making thousands per day.
An internal thread on a component or subassembly is much less likely to be damaged when shipping parts to the car manufacturer, during assembly or in use later.
In the case of a wheel hub assembly it also means fewer parts. The bolt replaced both the stud and the nut. You have to machine the hub, so tapping the internal threads is not a problem. Fewer parts, less costly.
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