Alan,
I have done most of the research on this in preparation for a series of
articles on British Fasteners. I don't have my notes with me at the moment
but I have equivalent ratings for Grades B, D, R, S, T & V with regard to
the specific "Tons Tensile" ratings for these grades. You can reference
these to the S.A.E. ratings of Grades, 2, 5 & 8.
Off the top of my head I believe that Grade "R" is 45-55 Tons Tensile
(nominal and ultimate loads) with equates roughly to a S.A.E. Grade 5.
I'll have the specific information later this evening.
And no, the letters are NOT the vendor, that would be the vendor name on the
bolts, e.g., WILEY, NEWTON, TORRINGTON, AUTO, and about 30 others.
One would think that an "S"rating would be a grade 8 but I believe that it's
closer to a Grade 5 and the "S" replaced the "R" rating in the early 1960's.
Cheers
Curt Arndt
Carlsbad, CA
'55 BN1, '60AN5 :{) '72 RWA Midget, '06 Cooper S
On Fri, Sep 5, 2008 at 9:16 AM, Alan Seigrist <healey.nut@gmail.com> wrote:
> All -
>
> Is there a guide somewhere that tells me what the codes mean on british
> made
> bolts?
>
> Specifically,
>
> Is type "R" similar to Grade 5 (US) and
> Type "S" similar to Grade 8 (US)?
>
> Is R good enough for most purposes on a Healey? Anything that requires
> Type
> S?
>
> Thanks,
>
> Alan
>
> '52 A90
> '53 BN1
> '64 BJ8
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