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Old April 18th 17, 05:08 AM posted to rec.bicycles.tech
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Default Selecting An Appropriate Bolt

On Tue, 18 Apr 2017 10:29:32 +0700, John B Slocomb
wrote:


If you want to talk length then yes. A bolt should be long enough that
one complete thread will be extend past the nut. but there is not
maximum length, un less, or course it hits the other side of the
automobile.



This is not true with AN hardware.AN hardware is spec'd by it's
diameter and grip length -and there is a stringent spec as to how much
thread must/may extend beyond the nut. You NEVER have threads within
the "grip"


It is not an 8-32, nor is it an 8mm. Both of these suggestions are ridiculous. It is an M6x18 and while fine m6 bolts do exist in 1.10 pitch they are not common and it is safe to say it is, in this application, almost undoubtedly a 1.0. You seem to have latched on the number 8 for some reason.

An M6X10 is the metric "functional equivalent" of a 1/4" UNC bolt.
It's dimensions and strength are very close. Being a metric bolt it
will be neither a Grade 5 nor a Grade 8. - it will be a class 8.8 or
10.9 or 12.9 An 8.8 is the metric "functional equivalent" to a grade 5


If you wish to be picky then let us be picky. There is no such thing
as a M6X10 thread, and even if it existed it would hardly be
equivalent to a 1/4-20 bolt. After all a 1 inch 1/4" bolt would have
20 threads on it while your imaginary M6X10 bolt would have only
(roughly) 4. Probably have to tighten the nut real tight to get it to
hold. I wonder can one even cut a 60 degree 10mm thread on a 6 mm rod?


Who's being picky??
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