just a quick one what size drill bit should i use for an M8 tap
cheers

 

Tap Metric Drill US Drill
3mm x 0.5 2.5mm -
4mm x 0.7 3.4mm -
5mm x 0.8 4.3mm -
6mm x 1.0 5.2mm -
7mm x 1.0 6.1mm 15/64
8mm x 1.25 6.9mm 17/64
8mm x 1.0 7.1mm -
10mm x 1.5 8.7mm -
10mm x 1.25 8.9mm 11/32
10mm x 1.0 9.1mm -
12mm x 1.75 10.5mm -
12mm x 1.5 10.7mm 27/64
14mm x 2.0 12.2mm -
14mm x 1.5 12.7mm -
16mm x 2.0 14.2mm 35/64
16mm x 1.5 14.7mm -
Drill sizes are for 75% depth of thread

 

good info