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Re: Nuts & Bolts for Concours (Was Re: BSF threads)

To: "Geoffrey P. Muttart" <gmuttart@mtdc.ns.ca>
Subject: Re: Nuts & Bolts for Concours (Was Re: BSF threads)
Date: Wed, 08 Aug 2001 17:33:30 -0700
Cc: Spridgets Group <spridgets@autox.team.net>
References: <37.190a303a.28a31de2@aol.com> <011301c12060$ca273180$e300005b@ws12>
The British UNF hex head screws on the Bugeye are marked with a small circular
depression on the top of the head.  The British UNF nuts have either a straight
line of overlapping circles embossed on one of the flats or a circle around the
threaded hole on top of the nut.  Some of the British UNF screws Have the
circular depressions AND the manufacturers name on top of the hex head, (ie.,
"Rubery Owen" or "AUTO", etc.).  Virtually all of the Phillips head (wether pan
head, oval head or whatever) have the 4 half moon cuts between the crosses on 
the
top of the screw.  This includes the door screws, cockpit aluminium, windshield
post, etc.  These screws are even where you don't see them such as in the door 
on
the hinge tongue.
     A source for the correct hex head screws and nuts is British Tool and
Fasteners.
Their web site is:  http://www.mrcybermall.com/machine_tool_parts/
Mike MacLean Supercharged 60 Sprite
P.S. Sorry you rae on your own for the original Phillips screws.  Plating?
"Geoffrey P. Muttart" wrote:

> For those Listers out there who aspire to maintain complete originality,
> Lindsay Porter's "Guide to Purchase and DIY Restoration" (now that I have it
> nearby) states that Spridgets use Unified National Fine (UNF) in "almost
> all" applications, which is "completely compatible with American Fine (AF)
> or SAE threads".  He goes on to state that:
>
> "A few applications use a Unified National Coarse (UNC) compatible with
> American coarse threads (some studs into the block and gearcase).  There are
> only a few applications of BSF (British Standard Fine) or BSW (British
> Standard Whitworth - coarse).  The dampers (shock absorbers) use a BSF
> thread for their filler screws.  All Lucas electrics use Whitworth until
> around 1969 when the change was made to metric."
>
> Additional information is provided in the book.
>
> My question is:  Is there a distinction between what UNF and AF/SAE look
> like when installed (particularly from a concours perspective).  (Perhaps
> symbols on the end of the bolts?)
>
> (All of this assumes that Porter is correct, obviously.  If there is some
> question about this, please let me know).
>
> Thanks for your assistance.
>
> Geoff Muttart
> gmuttart@mtdc.ns.ca
> Nova Scotia, Canada
> AH 'Bugeye' Sprite



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