[Healeys] Reamers

Bob Spidell bspidell at comcast.net
Mon Nov 30 07:11:22 MST 2009


I always believed all the hydraulic--inc. fuel--fittings were 
'Whitworth.'  Zat true?


bs


Curt/Nancy Arndt wrote:
> Simon.
>
> Off the top of my head, the only common BSW thread on most Healeys is the
> front generator support bracket which uses a 5/16 BSW bolt into a threaded
> hole in the aluminum front plate of the generator.
>
> The confusion with the 5/16 BSW thread is that it has the same threads per
> inch as the 5/16 UNC thread (Most BSW have the same TPI with UNC except for
> 1/2"), therefore this bolt will screw in but it's not correct and SHOULD NOT
> be used.  Why?  Because Whitworth fasteners, by definition have a 55 degree
> pitch angle on the threads while Unified fasteners are 60 degrees.
>
> And yes, if you have a 100-6 or early 3000 this bolt will have been
> Whitworth.  Even my Bugeye Sprite has a 5/16 BSW bolt in this spot.
>
> Anyone know of other BSW applications on other that the 100s?
>
> Curt Arndt
> Carlsbad, CA
> '55BN1, '60 AN5 :{)
>
>   


-- 
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Bob Spidell           San Jose, CA            bspidell at comcast.net

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