Calculators & Converters

Pilot Hole Design for Metric Thread Formers

Consider the screw size and material in order to determine the recommended screw hole size for metric thread-forming screws. Different materials may require different pilot hole sizes for optimal performance.

Start Your Calculation Based on DIN 7500-2

Tapping Holes for Die-Cast Metal

Model Used

  1. t1 [mm]: fillets, which provide an advantage for die-cast metals strengthening the mandrel, centering the screw, preventing buckling of the material, and adapting to suit cost-effective standard screw lengths
  2. t2 [mm]: bearing part of the tapping hole, taper angle α max. 1°
  3. t3 [mm]: thread engagement length for the tapping hole, taper angle α max. 1°