What are the reasons for the breakage of nut taps?

6 common reasons for the breakage of nut taps:

1. During the tapping process, the operator's hands exerted uneven force, causing the direction of the force to change and the tap to break. This situation often occurs in thread processing with a smaller diameter.

2. The bottom hole diameter does not match the nut tap. For example, when processing M5×0.5 threads, the bottom hole should be drilled with a Ø4.5mm drill bit. If a Ø4.2mm drill bit suitable for M5 is used for processing by mistake, the hole diameter becomes smaller and does not match the tap, and the torque will inevitably increase. At this time, if the operator still does not find that the wrong drill bit is used and continues to force tapping, the nut tap will inevitably break.

3. When processing blind hole threads, when the nut tap is about to touch the bottom of the hole, the operator does not realize it and still feeds it at the tapping speed before reaching the bottom of the hole, the tap will inevitably break.

4. When processing blind hole threads, if some chips are not discharged in time and fill the bottom of the hole, if the operator continues to tap forcibly, the tap will inevitably break.

5. The quality of the tap itself is problematic, which is also one of the reasons for the tap breaking during tapping.

6. At the beginning of tapping, the tap is not positioned correctly, the axis of the nut tap is not concentric with the center line of the bottom hole, and the torque is too large during tapping, which is the main reason for the tap breaking. The front end of the manual nut tap currently used is conical, and its initial working surface is in point contact with the bottom hole. The concentricity of the tap and the bottom hole depends entirely on the operator's skills and experience to maintain, and the tap must be twisted with both hands while pressing down. So many contents must be taken into account and carried out simultaneously. Even senior technicians with good technical levels cannot always master manual tapping operations accurately.