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New Foundation Bolt Tensioning Tools Added to Tentec Range

New Foundation Bolt Tensioning Tools Added to Tentec Aero Range

Tentec, a leading UK designer and manufacturer of bolt tightening equipment has been working closely with major manufacturers and suppliers of wind turbines looking at the problems associated with anchoring bolts into the foundation structure.


Due to the unusual length of foundation bolts and the anchoring methods used, relatively large amounts of bolt extension are seen. It is important, therefore, that bolt tensioning tools have plenty of piston/ram extension capacity. With this in mind, the new Aero Model WTF offer a 25mm piston/ram capability for “one pull” uninterrupted tensioning.

Another important design feature of these new tools is that they can be supplied to suit many different thread forms such as Williams and Dyson threaded bars and the more conventionally ISO metric and Imperial Unified Thread forms. Versatility is also key in the design of the Model WTF. As the amount of thread protruding can vary significantly from turbine to turbine, the tensioning tool has been designed to work in two different ways. When there is long stud protrusion from the foundation hexagon nut, a spare nut can be used on top of the Aero WTF tensioner, whereas with a short stud protrusion, an extended length puller can be used. This reaches down inside the tensioner to grip on to the short stud protrusion.

Full details and graphic illustrations are show on the Tentec Aero microsite at

Other features available include the inclusion of a gear nut run-down mechanism that offers a very rapid and consistent method to seat the foundation hexagon nuts during the tensioning procedure. To further aid speed in constructing the turbines, all WTF tensioners are fitted with a spring mechanism that automatically resets the tensioner once the pressure has been released to zero. The Model WTF is then automatically ready to tension the next bolt. No operator intervention is required.

All Aero WTF tensioners have been designed for use with Structural Hexagon Nuts to DIN 6915 & more conventional nuts to DIN 934. WTF is also designed for nuts that use washers to DIN 6916 & DIN 125.

For added versatility, multiple Aero WTF tensioners can be linked together with high pressure flexible link hoses to give simultaneous bolt loading. All suitable hoses and connections are available from Tentec

Electronic copy and photo is available from Eileen at eileen@inpress.co.uk

Further Details: Roy Sheldon. Tentec Ltd. Plymouth House. Guns Lane,
West Bromwich, West Midlands B70 9HS. Tel: + 44 (0) 121 524 1990 Fax:
+ 44 (0) 121 524 1999
E-mail: sales@tentec.net Web: www.tentec.net