The ER20 tap collet with internal square drive according to DIN ISO 15488 (DIN 6499) is designed for high-precision synchronized tapping operations on CNC machine tools, automatic lathes and machining centers. This solution belongs to the ER collet family specifically developed for threading applications and is characterized by the internal square drive that ensures positive tap drive during machining, preventing slippage and guaranteeing reliable torque transmission.

The ER20 system provides precise tool centering and uniform clamping force distribution along the shank of the tap. Clamping is performed exclusively on the nominal shank diameter with h8 tolerance, an essential requirement to maintain concentricity and stability throughout the tapping cycle. This configuration significantly reduces transmission play between tool and holder, improving thread quality and ensuring high process repeatability.

The integrated internal square in the collet couples with the square drive of the tap, allowing perfectly synchronized rotation with the machine spindle. This design is particularly suitable for operations where high torsional rigidity and accurate torque transmission are required during thread formation.

ER20 tap collets are designed for taps compliant with DIN 371, DIN 374 and DIN 376 standards, which are widely used in industrial threading operations. The absence of axial compensation makes these collets ideal for rigid or synchronized tapping systems, where the feed motion of the machine tool is perfectly synchronized with spindle rotation.

From an application perspective, these collets are widely used in various sectors of industrial mechanics, including automotive manufacturing, machine tool construction, precision machining and production of threaded mechanical components. They are commonly installed on CNC lathes, vertical and horizontal machining centers, tapping units and automated production systems.

The elastic structure of the ER collet ensures stable and uniform clamping, reducing vibrations and micro-movements of the tap during machining. This results in improved thread surface quality, longer tool life and greater reliability of the machining process.

Thanks to compatibility with ER clamping nuts equipped with eccentric extraction systems, installation and removal of the collet are fast and secure, simplifying machine setup and maintenance procedures.

ER20 tap collets therefore represent a reliable technical solution for industrial threading applications requiring high precision, rigidity and process stability, contributing to improved productivity and consistent machining quality.