how funny.
I wasn't going to be a whatever and say ..
'socket size for the hex head, or thread size  ??  '

most people correctly guessed the poster meant hex socket size.
now someone has thoughtfully gone  to the trouble to say the thread sizes.

if you ask what size a bolt is ..
you really have to say if you are asking what size thread it  is,
or what size wrench or socket goes on it.

   exhaust flange bolts are 8mm bolts or studs , for example...
that's 8mm thread with usually either a 12 or 13mm hex head or nut. .
M8 x 1.25mm  specifically ..
and they can have different size hex heads or nuts.

I'd say Mr Zimmerman answered the question more correctly, as it was
written.

but why aim for clarity in communication anyway ?
it's more fun when people have to guess what is being asked.

On 5/12/2012 10:22 AM, Phil Zimmerman wrote:
> ate:         Sat, 12 May 2012 10:56:00 -0400
> Reply-To:     "kenneth wilford (Van-Again)"<kenwilfy@COMCAST.NET>
>
>
> Does anyone know off the top of their head what size in mm the large crank
> pulley bolt on a waterboxer is?  Also size of rear axle nut on Vanagon?
>
> Thanks in advance for all help.
>
> --------
>  From Ekta
>
> Bolt for 3 groove pulley: M20x1.5x45x14*
> *(don't know what the 14 means hear? Thread tolerance perhaps)
>
>      Single groove pulley: M20x1.5x31,9
>
> Rear axle nut: M40x1.5
>
>
> Pz
> on a rock off the West Coast