RE: [CR]US Source of Whitworth Tools

(Example: Racing:Beryl Burton)

Date: Sat, 2 Jun 2007 20:51:14 -0700 (PDT)
From: "Fred Rednor" <>
Subject: RE: [CR]US Source of Whitworth Tools
In-Reply-To: <>

> >I bought a set of Whitworth tools from Snap-on years ago
> when I was
> >attempting to restore a Bentley (automobile). If memory
> serves, they
> >were
> >call "British Standard" sizing. You might try this link:
> >
> >group_ID=
> >567&store=snapon-store&dir=catalog
> Here's the link not wrapped:
> I believe Whitworth refers to the thread form, which is 55°
> instead of the
> more common 60°. Also, British wrenches (sorry, spanners)
> were described by
> the body diameter of the bolt, not the measurement across the
> flats of the hex head, like SAE and Metric.
> John Betmanis
> Woodstock, Ontario, Canada

John, What you wrote is correct, but the result of this system is that you end up with strange values across the the flats - e.g. things like 19/32". Fred Rednor - Arlington, Virginia (USA)

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