ExpaBolt
Fast positive and non-positive connections for blind holes
SCHAAF is leading the way with ExpaBolt bolts in order to revolutionize detachable flange connections of propulsion shafts of the shipbuilding industry. Not only are the bolts 100% non-positive and form fitting, which transfers high torque, but even after high stress they can be easily disassembled and reused. The bending and rotating resistant connection absorbed shock like changes of revolutions, torque as well as turning direction dependently. The system is made of heat treated steel, which is a safety plus during torque transfer. The safety factor in comparison to regular screws is 5. ExpaBolt is easy to handle since all tools and hydraulic high-pressure pumps for assembly and disassembly are adjusted to the system. ExpaBolt is certified by well-known buyers.
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Expa = Expansion = 100% positive locking in the flange bore Ten = Tension = frictional connection for the joint
Pressure connection bore
e to press out the Tapered Bolt.
Tapered Bolt made of high-strength quenched and tempered steel
l to absorb radial shear forces and a high axial pre-tensioning force.
SCHAAF Bolt Tensioner (SSV)
up to 4000 bar hydraulic pressure.
Positioning ring
g to hold the Conical Sleeve in position while the Tapered Bolt is being pulled into the Conical Sleeve. This results in expansion (Expa) of the sleeve and produces a press fit in the bore.
Guaranteed reusability
even after years of use. Again and again.
Pressure distribution grooves on the taper
to allow easy removal even after years of use.
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Advantages
ExpaBolt offers the following advantages over normal connections:
- Fast radial and axial bracing for components that have to absorb torques / shear force, axial force and / or bending moments
- 100% positive locking and frictional connection all the time after mounting, no slipping between the flanges
- 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
Quick form and force fit connections with detachable axial tensioning system (Quick Locking).
Optimal flange connection in case of non-aligned flange bores and / or bore diameters that are not the same.
Versions
The standard version of the SCHAAF ExpaBolt 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
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.
Services
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.
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