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M5 is the metric measurement of 5mm diameter the .5 refers to the gap between threads.
So it is a 5mm fine thread not only available in the states but any good engineering suppliers will get you a set.
they are only supplying one tap which you can use to some degree of success with care but we come back to a quality issue here.

[QUOTE="Grump, post: 76234, member: 232"] M5 is the metric measurement of 5mm diameter the .5 refers to the gap between threads. So it is a 5mm fine thread not only available in the states but any good engineering suppliers will get you a set. they are only supplying one tap which you can use to some degree of success with care but we come back to a quality issue here. [/QUOTE]

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