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Curtis,
Thank you for putting together such a definitive treatise on the fascinating
history of British threaded fasteners and the industry's conversion to U.S.
standards. The British experience is a precursor to the U.S. slow walking
conversion to ISO standards. Looking at Austin-Healey products, one might
think that the Brits were more accommodating to having a variety of
approaches than their U.S. cousins. Might be a cultural thing.
I, we, would like to read a supplemental discussion of the relative merits
of the 55 degree rounded roots and peaks thread design versus the U.S.
standard of 60 degree with 'V' roots and peaks. What I remember from past
discussions regarding the overall performance characteristics of modern
thread designs; including thread stripping, pull out strength, and fatigue
resistance favored Whitworth first, then U.S. standard, with ISO bringing up
the rear. Is that your belief?
Will you possibly in a later effort describe the best uses of the various
fasteners depending on the materials being joined, loads and their
direction, vibration, load cycling, etcetera in selecting fine versus
course thread; bolt shoulder, head, bearing surface and wrenching method,
and the many other criteria that enter into fastener selection.
You added to the points to consider when judging a car's concours 'as born'
condition. Thank you. However, would you consider expressing your opinion as
to which specific fastened joints a Healey owner might want to use a more
modern substitute fastener to make a more reliable daily driver?
Thank you again for your authoritative contribution.
Hap
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link=3D"#0563C1" vlink=3D"#954F72"><div class=3DWordSection1><p =
class=3DMsoNormal>Curtis,<o:p></o:p></p><p class=3DMsoNormal>Thank you =
for putting together such a definitive treatise on the fascinating =
history of British threaded fasteners and the industry’s =
conversion to U.S. standards. The British experience is a precursor to =
the U.S. slow walking conversion to ISO standards. Looking at =
Austin-Healey products, one might think that the Brits were more =
accommodating to having a variety of approaches than their U.S. cousins. =
Might be a cultural thing.<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>I, we, would =
like to read a supplemental discussion of the relative merits of the 55 =
degree rounded roots and peaks thread design versus the U.S. standard of =
60 degree with ‘V’ roots and peaks. What I remember from =
past discussions regarding the overall performance characteristics of =
modern thread designs; including thread stripping, pull out strength, =
and fatigue resistance favored Whitworth first, then U.S. standard, with =
ISO bringing up the rear. Is that your belief?<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>Will you =
possibly in a later effort describe the best uses of the various =
fasteners depending on the materials being joined, loads and their =
direction, vibration, load cycling, etcetera in selecting fine =
versus course thread; bolt shoulder, head, bearing surface and wrenching =
method, and the many other criteria that enter into fastener =
selection.<o:p></o:p></p><p class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal>You added to the points to consider when judging a =
car’s concours ‘as born’ condition. Thank you. =
However, would you consider expressing your opinion as to which specific =
fastened joints a Healey owner might want to use a more modern =
substitute fastener to make a more reliable daily =
driver?<o:p></o:p></p><p class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal>Thank you again for your authoritative =
contribution.<o:p></o:p></p><p =
class=3DMsoNormal>Hap<o:p></o:p></p></div></body></html>
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