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Fast positive and non-positive connections for blind holes

With SCHAAF ExpaBolt, form-fit connections of flange joints with blind bores are realised. Due to the positive locking, high torques or shear forces can be transmitted. Due to the axial clamping force additional axial loads can be transmitted by friction.


ExpaBolt offers the following advantages over normal connections:

  • Fast radial and axial bracing for components that have to absorb torques / shear force and / or bending moments
  • 100% positive locking
  • Simple and quick installation and removal of ExpaBolt 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, the torque, direction of rotation or direction of load
  • No jammed or oversized bolts any longer
  • High torque transmission, completely free from backlash

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 ExpaBolt comprises the following

  • Tapered Bolt and Conical Sleeve of high-strength quenched and tempered steel for maximum shear strength and axial load capacity
  • Round Nut
  • 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
Wind energy

Areas of Application

SCHAAF ExpaBolt is 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 ExpaBolt 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.



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

SCHAAF ExpaBolt 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.

Related Accessories

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High-pressure generators optimally matched to our high-pressure tools.

Hydraulic high-pressure accessories specially adapted to the function.


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Industry-specific special solutions:

All SCHAAF products offer an individual solution for every industry.

ExpaBolt proves particularly effective for:

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