Please refer to the table below for the recommended pilot hole diameters for Screw Thread Insert (STI) taps.

 

Cutting taps for screw thread inserts

・A-SFT HL
・EX-HL-SFT
・EX-HL-POT
・HL-HT 
 

Rolling taps for screw thread inserts

・HL-B-NRT