Technical

This easy to use chart allows you to directly compare Metric, Fraction, Gauge and Inch conversions from 0.3mm through to 40.8mmm.Click on the image to download

The flute form, web thickness and helix angle of the standard drill are suitable for most materials producing semi-continuous chips. Drilling sizes of 13mm and smaller in soft materials which produce continuous chips, e.g. copper, aluminium. A bright finish fast helix drill may be required to move the swarf more effectively. Conversely on materials producing discontinuous chips like brass, gunmetal and some plastics, a slow spiral is preferable. For effective drilling, the rigidity of …