Standardised Polygon Coupling Systems for CNC Turning Centre Optimisation

The TungCap series is a modular tooling system utilizing the ISO 26623 standard polygonal shank coupling (PSC) to provide high-rigidity tool holding and rapid changeover capabilities for high-precision machining environments. By expanding the lineup to include 75 new items, the system now supports a wider variety of stationary and rotating tool applications, particularly in sectors such as aerospace, automotive, and general mechanical engineering where machine downtime directly impacts the digital supply chain.

Technical Mechanisms of the PSC Interface
The core of the TungCap system is the polygon coupling structure, which serves as a mechanical interface between the machine turret and the tool holder. Unlike traditional cylindrical shanks, the tapered polygon shape provides simultaneous fit on both the taper and the flange face. This dual-contact mechanism ensures high static and dynamic rigidity, which is essential for maintaining tolerances in the automotive data ecosystem where component consistency is paramount.

One of the primary technical advantages of this system is its repeatability. The PSC interface provides a tip-position accuracy within ±2 micrometers. This precision level allows operators to replace tools without performing preliminary test cuts, a process that traditionally consumes significant machine time.

Expansion of Machine Compatibility
In January 2026, the expansion increased the total standard-specification offering to 559 items. This growth is specifically designed to bridge the gap between specialized quick-change equipment and standard CNC lathes. The new clamping units are engineered to be compatible with machinery from 31 different international manufacturers, allowing for the retrofitting of existing tool posts with high-precision PSC interfaces.




The expanded portfolio includes:

Efficiency and Operational Impact
The move toward standardized PSC interfaces addresses the industrial requirement for reduced machine downtime. By utilizing a unified interface across different machine brands, a manufacturing facility can standardize its tool inventory. This reduces the capital expenditure required for machine-specific holders and simplifies the maintenance lifecycle.

The high-rigidity design also supports increased cutting parameters. Because the polygonal shape prevents radial movement and provides a large contact area, the system can withstand higher torque loads compared to conventional VDI or round-shank systems. This mechanical stability results in improved surface finishes and extended tool life by minimizing vibration-induced wear on the inserts.

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