How to quickly identify the quality of tap?

Time：

2021-07-20 10:47

There are numerous tap brands on the market. Due to the different materials used and grinding methods, the price and quality are confused, which makes the buyer feel like a flower in the mist and don't know how to choose. Here is how to quickly identify the quality of taps.
When purchasing (except for slotless tap due to lack of testing equipment), it can be simply tested (M6 extruding tap as an example)
1: Check whether the chamfer at the front end of the extruding tap groove is uniform, and whether there is a notch at the cutting groove edge. The good ones are positive 7-shaped, and the bad ones are inverted 7-shaped or U-shaped (withdrawal of the tap will cause two cuts, which is easy to break and affect the accuracy of the thread).
2. Detection of heat treatment: whether the wire drawing cone is broken when it falls flat in a parabola (about 1 meter) in the air. If it is broken, it means that it is brittle and the heat treatment quality is poor.
3: Knock off the extrusion tap, and see that its fracture is oblique long, and the molecular particles (metallographic structure) in the fracture are fine, which indicates that the heat treatment and material are good, flat or oblique short, and the molecular particles (metallographic structure) are coarse, but not good.
The quality of tap mainly depends on its original material, heat treatment, groove type, precision, equipment, rotating speed and processed material, hardness, quality of operators, etc!
When selecting the extruding tap, pay special attention to the original material, heat treatment and groove type of the tap. For different processing holes, it is recommended to select different types of taps!
From the appearance: 1. Whether there are signs of blackening, yellowing and burns. 2. Whether the front corner of the edge is straight, and whether there is negative edge or step. 3. Whether the sign is clear and in compliance with relevant regulations.

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