Reading screw thereads

Im a little rusty Its been a few years since my mechanical drafting classes LOL. What does an M5x0.8 - 6g screw thread mean. I know M is metric 5 revolutions .8 pitch?

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M is Metric (as you mention)
5 is 5mm major diameter.
0.8 is the pitch of the thread.
6g is the tolerance class for the pitch and major diameters (ref: BS ISO 965-1:1988).

 
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