8-fold polygonal tool interface for

turning machines


An eight-fold polygon is the centerpiece of the polygonal turning interface (PTI) – a design element for high performance and accuracy.


The standardized contour of shaft and receiver is open to everyone and creates the conditions for a comprehensive supplier platform.


The new PTI interface is an upgrade for your lathe. Highest technological performance guarantees economic production.


A turret lathe is only as good as its tool interface. Discover the possibilities of the new PTI interface for your flexible production. Improve the quality of your workpieces and increase the productivity of your production.

The interface between turret disk and toolholder is a crucial factor – the pti-working-group supports you.


EMO Hannover 2019

At the EMO Hannover 2019, the companies of the pti-working-group and the extended body of experts present the new turret interface PTI. Get important information from our specialists on a development that will make your lathe even more powerful. We show PTI products from the toolholder and driven tool to the turret with clamping system up to the complete machine tool. For the first time you can see the new PTI interface in a vertical turning center at the EMO (Rasoma, NSH-Group).

PTI-standard proposal

The companies of the pti-working-group submitted the PTI standard proposal to DIN in May 2019 following completion of various successfully completed research projects. The proposal comprises the three parts: shank (1), receiver (2) and coupling (3). The proposal was accepted on 06 June 2019 at a meeting of NA 121-02-05 AA “Toolholders and Machine / Tool Interface” (DIN) and NA 122-59-01 AA “Machine-Side Toolholder Interface” (VDW). At DIN, the standard proposal is now being converted into a first draft standard under the number DIN 69108. It is expected that the PTI standard will be completed by the end of 2020. For information, the standard proposals can be downloaded. It should be noted that changes are still possible during the standardization process.


PTI-Normvorschlag_DIN 69108-1.pdf

PTI-Normvorschlag_DIN 69108-2.pdf

PTI-Normvorschlag_DIN 69108-3.pdf


Automotive Parts Manufacturing

Precision Parts Manufacturing

Medical Technology

Aerospace Industry

Watch Industry

Railway Industry



holds tight precisely and rotates

WTO has developed toolholders with the new PTI interface and introduces a program for static tool holders and driven tools in the PTI-sizes. Based on the design of the interface polygon, the PTI shank and holder body form a precise unit with all the necessary elements for mechanical power transmission and media supply. The tool receivers of the precision toolholders are matched to the PTI sizes and make the outstanding performance of the PTI interface technologically feasible at the cutting edge.

Features of the driven PTI toolholders are the large drive shaft and the wedge-shaped coupling, transmitting 85 Nm torque (PTI65).


clamps powerful and accurate

The simply constructed, compact PTI clamping system from OTT-JAKOB clamps the tool shaft centrically with high precision over a 25° clamping shoulder. The high pull-in forces (75 kN with 35 Nm actuation torque at PTI65) give the PTI system a high bending load capacity and the polygon a tight fit for high torque transmission. The quick change system with manual operation on a screw can also be used for automatic clamping.

OTT-JAKOB completes the range of PTI products with the manufacturing of the polygon flanges. They are fitted with a friction-enhancing coating technology that provides power transfer from the polygon flange to the turret disk.


receives and drives

Sauter has designed the PTI radial turret with a front cover which allows easy mounting of the PTI clamping system. The compact design results in a width across flats of only 340 mm for PTI65 with a 12-fold turret disc.
The turret construction allows both the use of Speed-Drive® and Torque-Drive® technology. Despite the installation of the components in a confined space, a stable turret design has been created, realizing the performance of the PTI interface to 100%. All pathways required for the media supply are integrated as well. A strong drive for DTH (85 Nm) gives the PTI65 turret a unique milling performance.

In addition to the tool turret, the Sauter product range also includes toolholders and driven tools with a PTI interface.


turns faster and out-of-round

Weisser completes the team of the pti-working-group and is the first manufacturer to integrate a PTI turret in a turning centre. With a power of up to 80 kW and a torque of 1,250 Nm the vertical turning center Univertor AM-1 is a basis for a solid realization of the performance of the PTI65 interface. As a pioneer of out-of-round turning technology, Weisser is a manufacturer of PTI parts and a partner to the toolholder industry. Tool blanks with PTI shank as well as PTI receivers are produced on Weisser out-of-round turning centers.