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Cheers.
So would you suggest I just give it another go with the M8 x 1.25 from the back side as dron suggested?
It should feel more or less like screwing a normal screw to start with, right?
Are there any tips for making sure that I start correctly?
hugo7-
So would you suggest I just give it another go with the M8 x 1.25 from the back side as dron suggested?
Yes. Get the tap started in the good threads, and that should hold it once it starts cutting the damaged area. If you can get the work piece onto your mill/drill table, use a tap follower to keep it aligned.
gbj_tester
5/16" is close enough to 8mm diameter to cause confusion, but the most common thread pitches of 18TPI (UNC) and 24TPI (UNF) are plenty far enough from 1.25mm to make the difference between the three pretty obvious. There is a 5/16"×20TPI UN thread which is very close to M8×1.25, but I'd be surprised if you had it. With a general industrial fit, you could get a 5/16"×20TPI UN male quite a long way into an M8×1.25 female before you noticed the difference.