[Healeys] Fastener Curiosity

[John Harper]

Mike

Just as a matter of interest; early Whitworth fasteners like nuts and bolts
heads were originally larger than is the general  case today

They were one size different so for example on a spanner you will see
markings like 1W/4 and 5/16 BSF. on the same end.

Best regards

On Fri, 5 Jun 2020 at 14:04, Michael MacLean <rrengineer.mike at att.net>
wrote:

> Kees,
>      I know the difference.  I have a degree in mechanical design and have
> worked as an aerospace fastener designer.  The threads in both nuts were
> exactly the same BSF thread.  The only difference was the distance across
> flats were BSF/Whitworth on one set of nuts and SAE across flats distance
> wise on the other set.  That is what surprised me.  I did not know hybrid
> fasteners even existed, but both sets were sold as fastener sets for 100-4
> pedestal studs.
> Mike MacLean
>
> Sent from AT&T Yahoo Mail on Android
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>
> On Fri, Jun 5, 2020 at 3:33 AM, Kees Oudesluijs
> <coudesluijs at chello.nl> wrote:
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-- 
Best wishes

John Harper

AHC UK 100 Register Secretary
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