12mm bolts on vanagons come in two differnt thread pitches.
those with waterboxer vanagons won't see many 12mm thread diameter bolts on
their vans..
but diesel vanagon owners will..
namely engine-to-bell housing ( the coarser thread ) and at the ends of the
engine cradle bars on the 82 Diesel vanagon.
The bell housing bolts use the coarser thread,
the 4 used in the ends of the 82 DV cradle bars use the finner
thread.......the same thread as the spare tire bolt.
for lug bolts. 14 X  1.5 sounds right.

----- Original Message -----
From: "Alistair Bell" <albell@SHAW.CA>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Tuesday, March 08, 2011 12:21 PM
Subject: Re: How to get that (bleep) spare tire out (continued)

> not that fine Scott, its a 1.5 mm thread pitch. Maybe you were
> expecting 1.75 mm thread pitch on a bolt that size?
>
> I believe the lug bolts/nuts are same 1.5 mm pitch, but a 14 mm
> diameter. MB uses 12 X 1.5 mm thread pitch on some model's wheels.
>
>
> alistair
>
>
>
>
> On 8-Mar-11, at 11:13 AM, Scott Daniel - Turbovans wrote:
>
>> so much discussion over one simple bolt !
>>
>> it is a 12mm thread diameter bolt.
>>
>> a 19mm hex head is a very normal size bolt head for a 12mm thread
>> bolt.
>>
>> It's a rather fine thread and is about the only spot in a waterboxer
>> vanagon
>> where you will find this fine  12mm thread.