Machine tap DIN 371 B HSS-E for through-holes – Koronet

The DIN 371 B HSS-E machine tap from Koronet is a precision tool designed for making ISO metric internal threads in through-holes. Made of high-quality high-speed cobalt steel HSS-E (HSSE), it ensures stable operation, good wear resistance and high thread quality in workshop and production conditions.

The tool will work well in the processing of structural steels, low-alloy steels and medium-strength materials, where process repeatability and control of threading parameters are crucial.

HSS-E steel – durability and stability of the process

The tap is made of high-speed steel with the addition of cobalt (HSS-E), which is characterized by:

• increased resistance to torsional loads,

• better stability of operation at elevated temperatures,

• higher wear resistance compared to classic HSS steel.

Thanks to these properties, the tool provides even cutting, stable guidance and a longer service life while maintaining a high thread quality.

Geometry B – for through-holes

The tap has a type B cut, designed for:

• threading in through holes,

• smooth and stable insertion of the tool into the material,

• efficient chip discharge towards the hole exit.

This geometry reduces the risk of thread damage and improves process safety, especially during machine threading.

Straight grooves – a proven solution

The straight grooves used ensure:

• simple and stable cutting geometry,

• Good process control in standard applications,

• versatility in the processing of typical steel materials.

This is a classic solution used both in series production and in workshop work.

DIN 371 standard – compact design

Compliance with DIN 371 means:

• shorter, compact tool design,

• Suitable for standard thread depths

• stable guidance in machine holders.

The tap is designed to work on CNC machine tools and conventional machines, where precision and repeatability are important.

Application

The DIN 371 B HSS-E machine tap is recommended for machining:

• structural steels,

• low-alloy and alloy steels,

• medium-strength materials,

• Parts that need to be threaded in through-holes.

The tool provides stable operation, good thread quality and reliability in everyday production applications.