#UN TAP DRILL CHART PDF#

To calculate tapping drill size for metric threads subtract the pitch from the major diameter, Select the next larger standard drill size. are based on an average of salary, housing & food allowances and health coverage with dependents.

#UN TAP DRILL CHART PDF#

Both are available as a printable tap drill chart PDF as well. eg for 3/4.10 UNC pitch = 0.1, diameter = 0.75, tapping drill = 0.65 = 16.5mm. The first tap drill chart below is in mm and the next in inches. This percentage is thoeretical as holes are often drilled slightly oversized.

eg for an M5x0.75 thread the tapping drill is 5-0.75mm = 4.25mm.įor Imperial (inch) threads the tapping drill size is calculated in the same way, diameter minus pitch. Tap Drill & Thread Height Chart This chart displays a variety of UN Thread sizes, their likely Tap Drills and the resulting Theoretical Thread Height Percentage. As a rule of thumb, for Metric threads, the tapping drill can be calculated by subtracting the pitch from the diameter of the thread.

Un tap drill chart