I remember reading something like this in Carroll Smith's fastener book....
Not the first time the wheel has been re-engineered.
tim
-----Original Message-----
From: Roger Sieling [mailto:sarl45@hotmail.com]
Sent: Monday, August 21, 2000 8:06 PM
To: derek.lola@sympatico.ca; vintage-race@autox.team.net
Subject: Re: Screw Threads (was BSP to NPT fittings)
Now look who's calling whom a Ludite.
>From: Derek Harling <derek.lola@sympatico.ca>
>Reply-To: Derek Harling <derek.lola@sympatico.ca>
>To: vintage-race@autox.team.net
>Subject: Screw Threads (was BSP to NPT fittings)
>Date: Mon, 21 Aug 2000 20:54:30 -0400
>
> > NO! BSP and NPT do NOT have the same Threads per Inch.
> > I think that the English just
> > went one thread off to confuse us over here.
>
>Reminds of the recent research by NASA (or some similar organization)
>into improved thread shape for high stress bolt applications. SAE Grade
>8 etc obviously didn't make it; some of you maybe surprised to find
>neither AS not MS made it - they actually recommended a "new" thread
>form which to all intents and purposes was the same as good old
>Whitworth! The 19th century strikes back.
>
>I'm sure I got the gist of the story right - maybe someone can correct
>the details.
>
>Derek
>
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