ARRGGHH - guys, you're right, I was off the beam on this one. Maybe I
should HEAD off this THREAD, grabbing the SHANK of the evening to WRENCH
myself back to reality....
Cat thread, anyone?
Cheers, PK
> ----------
> From: dmeadow@juno.com[SMTP:dmeadow@juno.com]
> Sent: Wednesday, January 28, 1998 2:41 PM
> To: Paul.Kile@Aerojet.com
> Cc: mgs@autox.team.net
> Subject: Re: Special Tools? (Clarification)
>
> On Wed, 28 Jan 1998 12:53:41 -0800 Paul.Kile@Aerojet.com (KILE, PAUL
> D)
> writes:
> >
> >If we are talking about fastener head sizes, there are only a few on
> >the B which use Whitworth (or British Standard) wrenches. British
> >Standard head size is similar to Whitworth head size, but differs by
> 1/16"
>
> Boy, if people weren't confused before, they sure will be now. See
> http://www.team.net/sol/tech/whitworth-hist.html for a full discussion
> of
> this. However, to sum up, the British used shank size not head size
> to
> denote the sizes of their wrenches. British Standard Fine altered the
> head size on a particular size shank. The result is that a BSF Wrench
> of
> 3/8" will fit the same nut as a British Standard Whitworth (BSW) 5/16"
> will fit. I guess this is what Paul means by a difference of 1/16".
> SAE
> wrenches will only fit BSF or BSW by accident, since they are sized by
> the size of the head of the bolt. BTW, Whitworth threads are
> different
> from BSF threads and are not interchangable, although the wrenches
> will
> fit. Confused yet?
>
> >Part of the confusion is that the old Whitworth head measurement
> >became known as British Standard (BS). This is entirely different
> from
> the
> >modern thread pitch known as British Standard Fine (BSF). BSF is for
> >all intents and purposes the same as the SAE's United National Fine
> >(UNF). That's why you can go down to the local 'Murrican hardware
> >store and find bolts whose thread size will work on a B.
>
> Eeewww. Where do I start? Ok, see above concerning "head
> measurement"
> as regards Whitworth and BSF. Now, let's go to threads as a separate
> issue. BSF threaded bolts are only found with BSF heads, however, as
> stated above, a Whitworth wrench will fit exactly, but it will have a
> different size marked on it. However, BSF threads are NOT the same as
> SAE or UNF threads. If you try to put a BSF bolt in a UNF or SAE (or
> vice versa) it will not fit. UNF is the SAE standard that British
> cars
> went to in the 50's and 60's. The MGA and younger MG's had mostly UNF
> (same as SAE) threads with some exceptions, mostly related to fuel
> lines
> and brake lines.
>
> >Clear as mud? I hope so, because this should be enough BS about BS!
>
> Wait a minute!! We haven't even discussed Nuffield's Mad Metric,
> which
> are the Whitworth-headed non-standard metric threaded bolts found in
> pre-1956 MG engines! And what about British Association (BA)? And
> British Standard Pipe (BSP)?
>
> The net of all this is, if you have an MGA or MGB, don't worry about
> it.
> If you have a TD or earlier car, you'll lie awake nights trying to
> figure
> it out.
>
> David Littlefield
> Sleepless in Houston, TX
> '62 MGA MkII (UNF and some BSF)
> '51 MGTD (Whitworth/metric, BSF, BA, and UNF (but I'm not tellin'
> where))
> '88 Jaguar XJ-S (Grace, space, and replace)
>
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