Steep Taper Drawbars & Grippers (SK)

Reliable Clamping for Automatic Tool Changers

When it comes to steep taper tooling systems, OTT-JAKOB’s automatic drawbars and grippers deliver unmatched performance and reliability. Engineered for high clamp force, consistent tool retention, and extended service life, these components are trusted by leading machine tool builders around the world.

Key Features

  • Universal Spindle Compatibility | OTT-JAKOB’s specially developed spindle inside contour allows the use of multiple tool standards (ANSI, DIN, MAS etc.) in the same spindle—maximizing machine flexibility.
  • Force Intensifying Mechanism | A maintenance-free force intensifier at the back of the spindle shaft boosts clamping force while ensuring reliable, long-term performance.
  • High Pull-In Force with Compact Design | Power drawbars deliver maximum clamping force in a compact package—reducing release forces, lowering spindle bearing load, and simplifying balancing.
  • Self-Locking System | Effectively prevents frictional corrosion and vibration damage to the spindle taper, extending spindle life and maintaining machining accuracy.
  • Optional Integrated Monitoring | Sensor packages offer tool presence detection and real-time monitoring of clamping force for enhanced safety and reliability.

Why Choose OTT-JAKOB Steep Taper Solutions?

High Clamp Force & Safety

Patented force intensifying technology ensures your tools remain secure in even the most demanding applications.

Proven Performance

Designed for SK/CAT steep taper systems, these drawbars and grippers meet or exceed OEM standards—delivering the durability and precision required in high-production CNC environments.

Complete System Integration

Compatible with all major machine interfaces and optional sensor packages for easy integration with automatic tool changers.

Universal spindle contour

Thanks to OTT-JAKOB’s specially developed spindle inside contour, various tool standards (ANSI, DIN, MAS, etc.) can be used in the same spindle—ensuring flexibility and compatibility across your machine fleet.

  • DIN 2080 (OTT-Rille)
  • DIN 69871/69872 (ISO 7388/1/2 Type A)
  • ANSI B5.50-1978 (ISO 7388/1/2 Type B)
  • MAS 403-1982 BT/PT1 (30°)
  • MAS 403-1982 BT/PT2 (45°)

configurations of ott-jakob steep taper drawbars (SK)


ES

With the inside spindle drawbar, the force intensifying mechanism is in a cylinder behind the spindle shaft. Due to the position of the gearing, the position of the clamping system can be monitored with ease. The ES configuration is suitable for applications involving spindle speeds of up to 10,000 rpm.

IS

In order to ensure that our steep taper clamping systems can also be used at higher speeds, the structure of the spindle integrated drawbar was kept as compact as possible by the force intensifying mechanism built into the spindle shaft. This allows for rotation speeds far higher than 10,000 rpm.

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