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100% positive locking in the flange bores plus frictional connection between flanges with guaranteed dismounting and remounting

ExpaTen – Safety and cost reduction

The leading design concept of SCHAAF ExpaTen takes hydraulic coupling bolt design to a completely new level. ExpaTen offers maximum product safety, reliability and overall performance. All other coupling bolt connections on the market have problems due to structural thread failures, the extension/extraction of the bolt or due to failure of the oil injection process during removal. The patented SCHAAF technology offers a lifetime warranty – even for multiple complete installations and removals.

The patented technology of the ExpaTen design achieves a radial expansion and axial preload that guarantees a 100% positive and frictional fit. This allows high torques to be transmitted via the coupling while remaining completely backlash-free. ExpaTen bolts have revolutionised the detachable flange connection of drive shafts using high-pressure hydraulic technology, which increases safety and leads to recognised time and cost savings. ExpaTen installation and removal is guaranteed and can be completed within 10 – 15 minutes per bolt. ExpaTen is certified by renowned customers.


Expansion and pretensioning result in the following advantages compared to conventional bolts:

  •   100% positive locking and frictional connection all the time after mounting, no slipping between the flanges
  •   Simple and quick installation and removal of ExpaTen even after years of use – nearly unlimited times
  •  Reusable after removal, again and again – no sparebolts required
  •  Torsionally and flexurally rigid connection even with sudden changes in the rotational speed, torque, or direction of rotation
  •  No jammed or oversized bolts any longer
  • High torque transmission, completely free from backlash
  • Reduction of flange dimensions possible due to fewer num
  • Maximum torque and shear force transmission in minimum space
  • Reusable after removal, again and again – no sparebolts required
  • Tolerance for mounting is 0.05 to 0.2 % of the bore diameter
  • Simple machine ring of the flange holes is sufficient

Overview ExpaTen

The Perfect Fastening Bolt

Perfect flange connection for high-speed turbines

Quick form and force fit connections with detachable axial tensioning system (Quick Locking).

Ideal flange connection for misaligned flange bores and / or unequal bore diameters

for flange-component connection

ExpaTen Speziallösungen


The standard version of the SCHAAF ExpaTen comprises the following components:

  • Tapered Bolt and Conical Sleeve of high-strength quenched and tempered steel for maximum shear strength and axial load capacity
  • Two ultra-high-strength Round Nuts
  • Fine thread for maximum fatigue strength
  • Pressure connection bore and pressure distribution grooves on the taper for easy removal of the Tapered Bolt
  • Protective caps in various designs and materials

Areas of Application

SCHAAF ExpaTen Bolts are the optimum solution wherever high forces (torques) must be transmitted and, at the same time, easy removal must be ensured. For example ship drive shafts, powerplants, crushers, steel
and non steel mills and windturbines.


Quality Assurance

All ExpaTen Bolts are checked for material quality, dimensional accuracy, correct functioning and load-resistance. During order execution, they are subject to continuous quality assurance measures and are supplied together with detailed technical documentation.



ExpaTen Bolts are, of course, supplied packaged, ready
for installation and use.

SCHAAF ExpaTen Bolts are user-friendly, reliable, and manufactured in accordance with the highest level of technical know-how. Our highly-motivated
staff would be pleased to train your personnel, in situ or at our works, in mounting and dismantling the bolts.

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Industry-specific special solutions:

All SCHAAF products offer an individual solution for every industry.

ExpaTen proves particularly effective for:

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