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Advantages 
of the purely axial tensioning force generation

Comparison between Bolt Tensioners and Hydraulic Nuts
Declaration on the basis of a video-presentation

 

Bolt Tensioners (SSV) 
Functioning of the Bolt Tensioners (SSV).

Hydraulic Nuts (HM) 
Functioning of the Hydraulic Nuts (HM).

Multiple Stud Nuts () 
Axial Bolt Tensioning using torque.

Tensioned Thread Geometry (TTG) 
Targeted equal force in the thread area

ExpaTen Bolt, ExpaTen 2, ExpaBolt
The ideal connecting bolt.

ExpaTen ETC
Perfect flange connection for high speed turbines

GripCon
Axial and radial force transmission in 
unreachable never seen before compactness

GripLoc PG 35, PG 36, PG 37, PG 38 and PG 39
The optimum connection 
for shafts and axles

.

Oil press fit A55-series 
The Hydraulic Nut for mounting and 
dismantling roller bearings and 
oil-pressure mountings.

STG 4000-2K 
Fully automatic production and 
separation of oil press fits.

STG 4000-2K 
Fully automatic production and separation of oil press fits.

Hand Lever Pumps up to 4000 bar hydraulic pressure
Hand Lever Pumps that are coordinated best with our high pressure tools.

Air-Hydraulic Pumps up to 4000 bar hydraulic pressure
Air-Hydraulic Pumps that are coordinated best with our high pressure tools.

Electrohydraulic High-pressure Units up to 4000 bar
Electrohydraulic High-pressure Units that are coordinated 
best with our high pressure tools.

Mounting Documentation System
Mounting Documentation System for controlling and monitoring 
the axial hydraulic tightening process of bolts. 

Hydraulic High Pressure Accessories
Hydraulic High Pressure Accessories which are customized to each application.

High Pressure Cylinders
Special High Pressure Cylinders which are customized to each application.

Hydraulic Mounting and Dismouting Devices
Hydraulic devices for mounting and dismounting hubs on conical or cylindrical shaft seats,
which are customized to each application.

Special Designs
Hydraulic High-pressure tools designed to the customers requirements.

Schemata, Tables, Diagrams
Tables for the sequence of tightening bolts, thread calculations and much more.

Clamping Nuts
Clamping Nuts are customized and can be used in systems that 
require quick clamping features or as overload limiters.

• Torsion-free generation of tension force – Economical use of bolt material capacity 
  A bolt is designed to hold two or more components together. Axial bolt elongation is the only force at work here. Torsion, which is generated, due to friction in the threads and in the support surface, by using torque wrenching methods, means only unnecessary weaking of the components. This requires stronger bolt connections. This disadvantage is no longer existing when using SCHAAF SSV and HM to generate the axial pre-tension. This increases the economic utilisation factor. Axial tension force has been attained by using SCHAAF SSV and HM for bolts with a thread diameter from 8 mm to over 800 mm.

• Maximum accuracy
  Since the pre-tension is purely axial and only varies by -4% maximum, bolts can be tightened up to the yield strength of the material used. An integrated displacement transducer even allows tensioning beyond the elastic limit.

• Increased safety 
  Due to the purely axial bolt tensioning force applied and as the safety factors given in bolt calculation instructions come down to a minimum, bolts can be higher tensioned for the same bolt thread cross section. The connection is more secure.

• Frictionless application of tensioning force
  Due to the purely axial bolt tensioning force applied, the main nut (SSV) or the locking nut (HM) can be threaded without effort or friction up to the flange. This compley eliminates the problem of chewing of the threads with a fine pitch or of bolt connections made of austenitic steel. For large bolt connections the calculated total torque is dependant, by more than 90% on the amount of friction. Estimated coefficients of friction for torque from µ = 0.08 to µ = 0.35 (a tensioning difference of around 400%) are now a thing of the past.

• Capability to start simultaneous tensioning at multiple points
  ?Crossover-tightening“ of several bolts at several points is no longer necessary, since SCHAAF SSV and HM offer the possibility of tightening all the bolt connections simultaneously with exactly the same tensioning force. This also applies when increasing the tensioning force.

• Start of tensioning independently of tensioning path 
  As opposed to thermal screw starting procedures, SCHAAF SSV and HM make it possible to eliminate different gaps between individual components. Each bolt can be tensioned with exactly the same force and not over the same distance!

• Quickest test capability at any time 
  SCHAAF SSV and HM make it possible to apply a residual tensioning force by means of test force stress application in order to determine if any settling of the screw may occur, and if so, to eliminate it.

• Universal application
  With a compact unit and the ability to interchange the component parts relating to the size of the bolt, SCHAAF SSV can also be used for other thread sizes.

• Saving of time
  SSV and HM will dramatically save time required for tensioning applications. This effect increases for higher tensioning forces, larger bolt thread diameters and also the installation of several SCHAAF SSV or HM. Time savings up to 99% are possible! It is no longer necessary to apply large torque by hand. There is a number of handling features available, designed to make work easier with SCHAAF Bolt Tensioners and Hydraulic Nuts, especially when it comes to large dimensions.

You can select from the following brochures, information and data sheets and print
them on your own printer: 
 

Company (Version 04/2015) 
Development, expertise, manufacturing and application of Hydraulic Tools.

 

Printversion

Ships (Stand 08/2014) 
Propulsion shaft and power generation solutions
for Ship Owners, Ship Managers, Ship Designers
and Shipyards

 

Printversion

SSV / HM (Version 09/2012) 
Prospectus about Hydraulic Nuts and bolt tensioning devices.
Main features, advantages and applications.

 

Printversion
SSV inquiry form
HM inquiry form

Hydraulic Nuts PG 9 /A55-Series (Version 03/2012)
Brochure and data sheets about Hydraulic Nuts of PG 9.

Printversion
Data sheet A55-Series

- Multiple Stud Nut (Version 09/2012)
Brochure about Multiple Stud Nuts of PG48.

Printversion
Inquiry form
Mounting tools
Data sheet

ExpaTen Bolt (Version 09/2011)
Principle functions of the optimal connection of large diameter shafts - free from backlash - powerful - resistant to bending.
Standard design - equipment variations - accessories.

ExpaTen ETC (Version 04/2015)
Principle functions of the Perfect flange connection for high speed turbines.

GripCon (Version 04/2015)
Principle functions of the Axial and radial force transmission in 
unreachable never seen before compactness.

GripLoc PG 35 - 38 (Version 09/2012)
Principle functions of the optimal connection for shafts and axles.

Printversion
Info
Diagramm
Inquiry form

Pumps and Aggregates (Version 04/2015) 
Overview of pumps and aggregates.

 

Printversion

HP-Series (Version 09/2011)
Prospectus of the Hand Lever Pumps from 1000 – 4000 bar
Rugged – Efficient – Safe

HDL 1000-4000 (Version 03/2012)
Prospectus of the Air-Hydraulic Pumps 
HDL 1000-4000.

Printversion
Data sheet 1000-2500
Data sheet 1600-4000

 

HDE 3000-BK (Version 03/2012) 
Prospectus of the Electrohydraulic High-pressure Unit 
HDE 3000-BK

 

Printversion
Data sheet

HDE 4000 (Version 03/2012)
Prospectus of the Electrohydraulic High-pressure Pump Unit 
HDE 4000.

 

Printversion
Data sheet
 

STG 4000-2K (Version 09/2011)
Prospectus of the fully automatic production and separation 
of oil press fits.

 

Printversion
Data sheet

MDS Mounting Documentation System 
(Version 09/2011)
Prospectus of the mounting documentation system.
 

Printversion

Hydraulic High-Pressure Hose data sheets
(Version 2006) 
Detailed data sheets of the High-pressure hose.

 

Detailed 
700 bar
1600 bar
2500 bar
3000 / 4000 bar
 

Pressure gauges (Version 04/2007)
Detailed data sheets of the pressure gauges. 

 

Overwiew


 

Nipples / Adapters / Manifolds (Version 05/2009)
Detailed data sheets of nipples / adapters and manifolds.


 

Nipples / Adapters
Manifolds


 

Wind turbines (Version 09/2011)
SCHAAF offers specially coordinated products up to 4,000 bar hydraulic high-pressure technology for application
areas such as e. g. the assembly of devices, shaft and axle connections, blade and hub fi xing, axle and bearing
connections.