Bob,
Whitworth in that I beleive they are BSPP (British Standard Pipe Parallel.)
Remember there are five different Whitworth thread forms, i.e. BSW, BSF,
BSPP, BSPT, and BSB (British Standard Brass.)
British Standard Fine is the most common on the 100s, followed by Bripish
Standard Pipe Parallel, and a few British standard Whitworth.
Cheers,
Curt
On Mon, Nov 30, 2009 at 6:11 AM, Bob Spidell <bspidell@comcast.net> wrote:
> 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 :{)
>>
>>
>>
>
>
> --
> *******************************************************************
> Bob Spidell San Jose, CA bspidell@comcast.net
>
> *******************************************************************
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