> A friend wants to replace
> this bolt with a US equivalent
I can't answer your question, Alex, just wanted to point out that there may
be more to that bolt than just grade. For example, TR driveshaft bolts have
a particular diameter and length of unthreaded shank, and unusually short
threads.
IMO it's unlikely to be any stronger than SAE grade 5, but that's just a
guess. One way to estimate it is to look at the torque spec. Standard
torque for a grade 5 7/16-20 is 75 ft-lb. If the specified torque is less
than 75, it's probably less than a Grade 5 bolt.
Randall
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