For concours you definitely want to retain the original fasteners whenever
possible, as their appearance varies from those available new. There is an
excellent discussion and specifications of fasteners in the appendix of
"Austin-Healey 100/100-6/3000 Restoration Guide" by Gary Anderson and Roger
Moment.
Doug Ingram
Victoria BC
1958 Sprite (AN5L/636)
1963 Sprite Mk II project (HAN7L/30003)
1987 Jaguar XJ6 VDP
----- Original Message -----
From Geoffrey P. Muttart <gmuttart at mtdc.ns.ca>
To: Spridgets Group <spridgets@autox.team.net>
Sent: Wednesday, August 08, 2001 4:20 PM
Subject: Nuts & Bolts for Concours (Was Re: BSF threads)
> 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
|