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The other thing is to see if you actually have a metric thread, or if there is a metric close enough to do the job.
5/16 is 7.9375 mm. Very close to 8.0 mm (0.0025 inches off)
34 TPI is .747 pitch in mm, very close to 0.75.
An M8 x .75 tap will be easier to find and is probably the actual corect size.
It is a standard metric fine thread.
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