The rule I learned is that you only need
thread-to-thread contact as deep as the bolt shaft is
wide. The context for the rule was wheel lugbolts on
Porsches, but it makes some sense.
Using the rule, a 3/8" shaft bolt (any length) that
has 3/8" of thread-to-thread contact won't be any
stronger, or any less apt to break, than one with 3/4"
of thread-to-thread contact. [Substitute your actual
bolt size for 3/8"]
OICBW,
M D "Doc" Nugent
Renton, WA
--- Larry Vaughan <lvaughan@pldi.net> wrote:
> . . . how
> much thread length should enter the crank when
> bolting on a flywheel?
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