At 09:35 PM 02/06/2007 -0400, Phil Whirley wrote:
>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
>call "British Standard" sizing. You might try this link:
Here's the link not wrapped: http://tinyurl.com/ysafnl
I believe Whitworth refers to the thread form, which is 55° instead of the more common 60°. Also, British wrenches (sorry, spanners) were described b y the body diameter of the bolt, not the measurement across the flats of the hex head, like SAE and Metric.