I have no issue with exceptions to the rule.  I'm sure VW has done their
homework.

Other factors to consider when fastening parts with nuts and bolts: Cut or
rolled threads, grade of the nut and bolt, thread pitch, material type.

-Dick-

On Thu, Mar 13, 2014 at 11:09 AM, mark drillock <mdrillock@cox.net> wrote:

> Rule of thumb aside, on factory alloy wheels VW used nuts that didn't
> even come close to meeting your "stud is flush or protruding" goal. A
> mere 7+ threads was deemed sufficient by one of the worlds largest and
> most successful car maker.
>
> Mark
>
>
>
> Dick Wong wrote:
>
>> General rule of thumb for bolt to nut engagement:  From a strength
>> standpoint, the minimum length of thread engagement should be at least the
>> diameter of the bolt.  For a 14mm x 1.5 lugnut/lugbolt, you should go for
>> 14mm of engagement.  If you can't measure the available thread length, you
>> can calculate the minimum number of turns needed by knowing the thread
>> pitch.  In our case, the thread pitch is 1.5mm per thread.  The nominal
>> bolt diameter is 14mm, therefore 14mm/1.5mm per thread = 9.3 threads.  And
>> since there is one thread engagement for each turn, the minimum number of
>> turns is 9.3 for the nut/bolt engagement.
>>
>> In the case of a lugbolt engaging into the brake drum, if the drum wall
>> thickness is less than the bolt diameter, there is no further strength
>> gain
>> by going beyond the depth of the available threads.
>>
>> If nothing else for a nut on a stud, make sure the stud is flush or
>> protruding from the top of the nut.
>>
>>
>>