> What is meant by the "M" sizes on screws and bolts?

What is meant by the "M" sizes on screws and bolts?

Posted at: 2015-01-07 
Metric

Metriccccc.

Hmm Michael is right

so I assume by that, that a M5 bolt/screw would by a 5mm width thread, so a M6 would be 6mm, followed by a M7 7mm, etc, etc, is this right please?