Hydraulic expansion technology

Stay ahead of the technology

As inventor and market leader in the field of hydraulic expansion technology for more than 30 years

The high requirements of our customers are our drive for perfection.

Your advantages of hydraulic expansion toolholders from the market leader

Sophisticated technology with simple operation

More than 30 years of experience in designing hydraulic expansion technology

Micron precise tool change in seconds without
peripheral equipment

Time savings due to reduced set-up times and no investment
and energy costs for additional clamping devices

Excellent vibration damping

Micro-blowouts are prevented, best workpiece surfaces, machine spindle protection, increased tool service life resulting in a reduction of costs

Fine-balanced by default

With a balancing grade of G2.5 at 25,000 RPM,
suitable for high speeds of rotation.

Permanent run-out and repeat accuracy
< 0.003 mm

Even cutting action, increased tool service life,
and reduced costs for regrinding or
buying new tools

Dirt grooves for reliable torque transmission

Dry clamping surfaces, by displacement of oil,
grease or lubricant residues into the dirt groove

High level of flexibility

Clamping of different diameters due to the use of slotted or coolant-proof intermediate sleeves

Benefit from the inventor's experience

SCHUNK - the pioneer in hydraulic expansion technology
The first clamping tools were produced with the hydro-expansion principle as early as 1980 for a wide range of our customers' applications
Our expansion toolholders for clamping shank tools were standardized in 1983
In response to the already constantly increasing requirements of dynamic production technology, a patent was filed on 02/26/1990
TENDO was launched in 1990 as a new generation of standard expansion toolholders

Continuously perfected for your requirements

1991

TENDO Platinum
Over 30 years of experience.

2007

TENDO LSS
Super-slim. High-precision. Optimized interfering contours.

2008

TENDO ES
Zero interfering contours.

2010

TENDO E compact
Up to 300% longer tool service life.

2016

TENDO Slim 4ax
1:1 interchangeable with heat shrink toolholder

2021

iTENDO²
Same shape, but with an intelligent real-time sensor system

More about TENDO Platinum

More about TENDO LSS

More about TENDO ES

More about TENDO E compact

More about TENDO Slim 4ax

More about iTENDO²

Satisfied customers drive us

"The hydraulic expansion toolholders from SCHUNK are the right mounts for us because they decouple the vibrations. Compared to heat shrinking technology, using hydraulic expansion technology not only offered a better energy balance, but also better machining results."

Lukas Betz (center), Managing Director, ROC

"Every single measuring device that we machine here undergoes a hundred percent inspection. Because we are extremely strict about everything here, we are happy to now be able to continue working seamlessly with the new TENDO E compact. We can hereby be sure that everything is one thousand percent correct."

Martin Römer (center), Plant Manager, Lehren- und Meßgerätewerk Schmalkalden

"With TENDO Slim 4ax, it was possible to achieve significantly longer tool life and optimal surfaces, allowing us to completely eliminate a second finishing process that was previously necessary."

Thomas Petermann, Production Manager, South Branch, Ingersoll Werkzeuge GmbH, Vaihingen-Horrheim

1) Clamping screw

The clamping screw is used to move the clamping piston. Clamp the clamping screw to dead stop using an Allen key. A torque wrench is not needed.

2) Clamping piston

The clamping piston compresses the hydraulic fluid into the oil chamber system.

3) Expansion sleeve and oil chamber

The expansion sleeve evenly expands against the tool shank. The tool shank is centered first and then clamped powerfully and uniformly across the entire surface during this clamping process. When the chamber system is filled with hydraulic fluid, it has a damping effect on the clamped tool. Wear on the cutting edge of the tool is minimized, service life is increased by up to 40%.

4) Base body

The machine-side interface is located on the base body.

5) Length-setting screw

For fast and easy tool-presetting.

6) Tool

The tool is centrically clamped to the middle axis – highest run-out and repeat accuracy of less than < 0.003 mm.

7) Dirt groove

The enormous clamping pressure of the hydraulic expansion toolholder creates a displacement of oil, grease, or lubricant residues into the groove, whereby the clamping surfaces stay dry.

Modern hydraulic expansion toolholders are more sustainable

Especially in this day and age, sustainability in the production process is becoming increasingly important. The focus is not only on saving energy. The economic efficiency of the means of production used and the retention of skilled workers in the company have also become elementary components.

With hydraulic expansion technology from SCHUNK, you can contribute to more sustainable production. Due to the choice of many different TENDO models, conventional clamping devices can be easily replaced for almost all metal cutting tasks.

The reasons why hydraulic expansion toolholders are sustainable:

Economical:

Significantly longer service life than shrink toolholders
Reprocessing possible by SCHUNK for a second life cycle
No material fatigue due to the shrinking process, thus consistent clamping quality
Efficient production process due to a fast tool change of maximum 2 minutes

Resource saving:

No energy expenditure as with shrinking
Less power consumption and lower CO2 emissions

Attractive:

Skilled workers like to work with modern work equipment
Safe clamping without risk of burns for employees
Easy handling and thus pleasant work

Always the optimum tool holding system for your task

Intelligence

SCHUNK iTENDO² for safe "closest-to-the-part" workpiece machining in the unmanned, automated production process with the necessary intelligence

Find out more about iTENDO²

Premium

SCHUNK TENDO Platinum is DIN-compliant in 29 interfaces and over 1,000 variants
SCHUNK TENDO Slim 4ax in DIN-standardised heat shrink contour

Tech

SCHUNK TENDO LSS, ES, KSR, ZERO and Engineered are problem solvers for the most demanding tasks in every machining process

Economy.

SCHUNK TENDO E compact for volume machining, drilling, reaming and threading

Find out more about TENDO E compact

Basic

Mechanical toolholders form the basis of the SCHUNK total tooling complete program

Quickly find the matching toolholder

Find the right hydraulic expansion toolholder from the SCHUNK portfolio with just a few clicks.

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