Metric System??

Can any one explain me what is metric system in a easy way??? getting confused in this... does 5M thread means 5mm thread diameter????
thanks in advance

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The "M" designation for metric screws indicates the nominal outer diameter of the screw, in millimeters (e.g., an M6 screw has a nominal outer diameter of 6 millimeters). Wiki.

 
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As Mihail pointed out, the 5M designates the nominal outside or inside diameter of the thread. Whether it is outside or inside depends on if you are working with a nut or a bolt. Keep in mind that these are "nominal" dimensions, don't expect a bolt or nut to actually measure 5mm.

In additional to the diameter, the pitch would also be listed. Maybe like M5 x 0.8
The pitch is a measurement of how fine or coarse the threads are. Smaller values are finer.

 
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Hai Mohammedazim

Matric System means [(MKS) Meater, Kelogram, Second] System
Where, Unit of Length is Meater.
Unit of Weight is Kelogram.
Unit of Time is Second.
This is Worldwide Standard in Matric System.

 
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