cool ...

On Thu, Jun 17, 2010 at 1:08 PM, John Reynolds <transporterjr@yahoo.com>wrote:

> Seat belt bolts are, for the most part, size 7/16-20 the world over - even
> on non-USA cars.  GM switched to M12 a number of years ago, now they have a
> global standard and Europe insisted it on being 7/16-20, so new GM designs
> will (again) be 7/16-20!
>
> The US MVSS  209(motor Vechicle Safety Spec) originally specified 1/2-20
> and 7/16-20 (some early cars used 1/2-20), it now has added "or metric
> equivalent".  Funny thing is, US made cars had seat belt bolt standards to
> pass, imported cars only had to have the entire system pass, so some imports
> had M10 size bolts, but even cars that were never going to be made here
> generally used the 7/16-20 size.
>
> So what Dave says below is true - the bolts are actually 7/16-20.
>
> John -
> Who has has been involved in testing and design of "few" seat belt bolts
> for a few decades now.
>
>
>
>
>
>
> >Just so happens that 7/16-20 UNF is practically identical to
> >M11x1.25; 1% on diameter and 2% on pitch.  For a short thread
> >engagement this doesn't matter.  The UNF and ISO thread forms are
> >slightly different, but not enough to matter here.
>
> >Yours,
> >David
>

--
roger w
From Proverbs:
Under three things the earth trembles, under four it cannot bear up: a
servant who becomes king ...
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