| 摘要 |
A thread-forming tap is provided to which a chamfer (4) can easily be mounted. The thread forming tap has a threaded portion (3) comprising a tapered chamfer (4) and a parallel threaded portion (5) formed continuously with the chamfer (4). The depth of the root of the chamfer (4) is set equal to that of the root of the parallel threaded portion (5) constantly. <IMAGE> |
