Thread cutting dies with undersize at Gewindebohrer.de

The correct dimensions are particularly important when cutting external threads. After all, no matter how carefully you work and take care to keep the thread cutting die holder plumb - if the nut doesn't fit on the bolt in the end, then the nicest thread is of no use to you. That's why every screw tap can be assigned to a tolerance class, which specifies exactly what margin there is in the dimensions. This way, you ensure the correct fit of nut and bolt.

Sometimes it may be necessary to cut the external thread slightly smaller. This is then referred to as undersizing. This usually happens when coatings are subsequently applied or the bolt undergoes heat treatment. In other words, whenever the dimensions of the bolt change again after the external thread has been cut. In these cases, you then need a thread cutting die with undersize. The undersize thread cutting die cuts the thread slightly smaller than a standard thread cutting die, creating space for the coating. Indispensable so that you do not experience any unpleasant surprises!

Have you found the right undersize thread cutting die for your application? Then there is only one step left to the precisely fitting external thread: You still have to determine the correct bolt pre-machining diameter. This is also particularly important for thread cutting dies with standard tolerance. But be careful: other values apply to thread cutting dies with undersize. The easiest way to do this is to have a meaningful table at hand. At BAER Online-Shop for screw taps, you will find the appropriate information linked to each product page for thread cutting dies with undersize. In the table, first find out the nominal thread diameter you want. Then simply read off the guide value for the undersize tolerance 6e.