Common methods for removing Tapping cone that are broken in threaded holes

2025-09-01 15:14:25

（1） Vibration method

The breakage of Tapping cone usually occurs suddenly under high force, causing the cutting edge of the half Non standard tap that is broken in the threaded hole to be tightly wedged in the metal. It is generally difficult to separate the cutting edge of the Non standard tap from the metal. In order to loosen the Non standard tap in the threaded hole, vibration can be used.

Before vibration, the chips should be cleaned thoroughly. If there are cracks on the Non standard tap that have not been broken, try to pull them out as much as possible to prevent the Non standard tap from getting stuck again when spinning. When doing the above cleaning, be careful not to damage the cut threads, otherwise it will hinder the removal of the Non standard tap.

When vibrating, use a curved chisel to press against the chip groove of the Non standard tap, take a hand hammer weighing less than half a pound, and repeatedly tap gently in the positive and negative directions of the thread until the Non standard tap becomes loose and can be smoothly tapped out.

（2） Corrosion method

When cutting stainless steel materials and Extrusion tap break inside the workpiece, the workpiece can be immersed in nitric acid solution for corrosion. Because stainless steel can withstand nitric acid corrosion, while Tapping cone made of low-alloy tool steel or high-speed steel can quickly corrode, it is very convenient to remove the broken Non standard tap.

（3） Arc cutting method

Tapping cone above M10 can be cut off by welding. Immediately align the electric welding rod with the broken Non standard tap to form a small high-temperature arc between the welding rod and the broken Non standard tap, causing the middle part of the broken Non standard tap to melt within 15 to 30 seconds, and then remove the slag.