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ExpaTen QL

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

ExpaTen QL is the optimal connection for flanges that are designed with a threaded blind hole on one side. By adapting the shape and the assembly method, achieving a 100% positive and frictional connection is also guaranteed for this flange hole variant.


Due to ExpaTen QL the following advantages result compared to conventional connections:

  • Quick radial and axial tensioning for components, which cope with torque / shear force, axial force and / or side load
  • 100 % form fit and friction fit
  • Simple and quick installation and removal of ExpaTen QL 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 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 ExpaTen comprises the following

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

ExpaTen QL Bolts are the optimum solution wherever, one of the thread ends of the ExpaTen Bolt has to be screwed into a stud hole and the connectable components need to be mounted with 100% form fit and friction fit.


Quality Assurance

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



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

SCHAAF ExpaTen QL 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 QL proves particularly effective for:

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