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JIS Zinc Pre ISO Coarse Pitch

In April 1967 the JIS (Japanese Industrial Standard) was changed to match the screw pitches of the ISO standard.
A little chart is below comparing pre April 1967 JIS screw pitches with post April 1967 JIS screw pitches.
It may help explain why some metric screws don't seem to fit on your motorcycle or car.
 
Pre Apr 1967 JIS
3mm.....0.6
4mm.....0.75
5mm.....0.9
6mm….. 1.0
8mm.....1.00
10mm...1.25
12mm...1.5
 
Post Apr 1967 ISO
3mm.....0.5
4mm.....0.7
5mm.....0.8
6mm… ..1.0
8mm.....1.25
10mm...1.5
12mm...1.25