COLD FORMING TAP AND THREADING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a cold forming tap to be easily provided with a fitting part, and to provide a threading method having high flexibility. SOLUTION: A screw part 3 of the cold forming tap 1 has a leading part 4 tapered toward a tip thereof and a parallel screw part 5 continued thereto. Depth of a bottom of the leading part 4 is formed constant and equal to the depth of the parallel screw part 5.