Technical Pilot Hole Sizes
Page 1 of  1          Screw Size Metal Thickness Type A-AB Sharp Point Use Drill No. Type B Blunt Point Use Drill No.   20  .038  40  42    22  .031  42  42    24  .025  42  43    26  .019  44  44  No. 4 .125"   28  .016  44  44