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Whitworth Question

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The crankshaft thread was much beloved by Austin. It appeared on Austin Seven crankshaft and half-shafts long before the A-type.
I have read that it was originally an Admiralty specification.
 
OK sorry I asked this wrong - if you go to the (kijiji) ad it is selling wrenches and sockets - I thought the different bolt head sizes were metric/ Imperial (American) and Whitworth.

Aren't the head dimensions of BSF and BSW threads the same as any other imperial bolt size? IE a 7/16 bolt uses a 7/16 wrench regardless of thread size?
 
American wrench sizes are measured Across Flats. A 1/4 in bolt has a 7/16 head, typically, a 5/16 has a 1/2 inch.
BS wrenches (spanners) are marked with the thread size, and the heads are not the same as SAE sizes.
 
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