I am sure there is a simple way to calculate a revised torque figure when
switching from one grade of bolt to another. There is nothing special about
the manufacturers figures - they just decided to use a certain spec of bolt
and then calculated the torque figure for it.
1312
In a message dated 16/10/00 03:52:04 GMT Daylight Time, ccrobins@ktc.com
writes:
<< The reason to stay with the same grade bolt as was originally supplied
is that it's the only way to make the mfr's torque figures apply.
Torque figured are meant to stretch the fastener to the middle of its
tensile strength. Change the elasticity of the fastener and you change
the torque spec. Then you don't know what the correct figure is for the
application.
The above is why I doubt what you said about the fastener losing its
tensile strength when torqued to the right spec.
Regards,
CR
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