How to check the quality of taps

There are many grades of taps on the market.

Due to the different materials used, the prices of the same specifications also vary a lot, making buyers feel like they are looking at the flowers in the fog, not knowing which one to buy. Here are a few simple methods for you:

When purchasing (because there is no testing equipment, except for slotless taps), it can be easily tested (M6 as an example):

1.  1.Check whether the thread relief grinding (chamfering) at the front end of the tap groove is even, and whether there is a quick opening on the edge of the cutting groove.If it is good, it is in the shape of a positive 7, and if it is not, it is in the shape of an inverted 7 or U (it will cause two times when the tap is withdrawn. Cutting, easy to break and affect the accuracy of the thread;
2.  Check the heat treatment situation: whether the tap tap is dropped into the air in a parabola (about 5 meters) and whether it breaks, which means that it is brittle;
3.  Break the tap and see that its fracture is obliquely long, and the grains (metallographic structure 10.5#) in the fracture are finely knotted, indicating that the heat treatment and material are good, flat or obliquely short, and the grains (metallographic structure) are rough it is good.

The quality of the tap mainly depends on its original material, heat treatment, groove shape, precision, equipment, speed and processed material, hardness, quality of the operator, etc., it has a lot to do with it!

When choosing a tap, pay special attention to the original material, heat treatment, and groove shape of the tap. For different processing holes, it is recommended to choose different types of taps!

In actual operation, it is very important to sharpen the cutting edge, especially for stainless steel series, it can be cut in stages, and the length of the guide can be used.

The cutting edge should be ground into a lower angle to increase the strength of the tap. At the same time, cooling and lubrication must be Keep up with (pumping), the service life of the tap is relatively long! In short, it is being treated on a case-by-case basis.

If you have any need about machine taps, you can check on our shop.