A good rule of thumb for finding the tap drill size for a metric screw is to subtract the
pitch from the major diameter.
For example: M5 x .8, the tap drill is 5 - .8 = 4.2mm.
A good rule of thumb for finding the tap drill size for a metric screw is to subtract the
pitch from the major diameter.
For example: M5 x .8, the tap drill is 5 - .8 = 4.2mm.