Thread dimensions for ISO "medium" class threads 1,6mm to 300mm
Equations & Tables for Screw Thread Tolerance calculations
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Sites Providing Information On Bolt/Screw Design
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Note: on tapping holes:
I normally specify a tapped hole depth of 1.5 dia for a fully threaded hole in a blind tapped hole (steel male and female).
The depth of threaded hole if a plug tap is not used i.e for automatic one stage tapping would be deeper.
According to BS1936 the tapping drill should be have a depth greater than the tapped depth (clearance depth) as follows
Less than M6 = 0.25 x full thread depth...
M6 TO M12 = 0.2 x full thread depth...
Greater than M12 = 0.15 x full thread depth.