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Hydrajaws - About Us

Hydrajaws Limited have recognised the need for a simpler method of carrying out on-site testing of anchors and fixings, preferably using a single hand held unit. 

The First Tester

Through a contact with the fixing industry, Hydrajaws Limited recognised the need for a simpler method of carrying out on-site testing, preferably using a single hand held unit which would have none of the problems associated with testing in locations with difficult and restricted access. Using our design capabilities and hydraulic experience we began formulating our ideas for a truly portable tester, lightweight and fully self-contained, which could be used by any reasonable operator on site as well as carried around by visiting building inspectors.

When our first prototype was introduced to the market in 1985, the response from the fixing industry was immediate and quite soon we were working with fixing manufacturers, carrying out modifications and improvements to the original concept based on the suggestions made.

As a result we were able to create a tester which would meet the precise requirements of the industry, taking into account installation efficiency and material strength as well as the design and mechanical strength of the anchor itself.


Over the years we have gained considerable experience in the field, and through the continued co-operation of the fixings industry, safety officers and specialist installers, we have continued our work of development, increasing the capacity range and introducing a wide choice of adaptors and load spreading bridges or stools to match the wide variety of fixings in use and our widely differing applications. Special refinements have been added to the tester itself, such as linear movement scale enabling the operator to measure more precisely the first movement of a fixing under the test loading.

Our Tester Range

The Hydrajaws fixing tester comprises of a hydraulic cylinder contained within an aluminium body and connected to a turning handle. At the opposite end is an attachment for securing the fixing, while a dial type pressure gauge with maximum load pointer gives a reading of the loading as it is progressively applied through rotation of the handle. Several models are available including the popular medium duty model with maximum capacity of 25 kN and the heavy duty version of 145 kN.

The testers are designed to suit the requirements of various testing procedures and standards including BS5080 and the construction fixings association (CFA) in respect of installed fixings. Testers are in kit form complete with carrying case and all the necessary accessories including a load spreading bridge. The latter item is of special significance as it provides an unsupported area around the fixings, so giving a true value of both the mechanical efficiency of the anchor itself and the strength of the concrete or masonry into which it has been installed. This is of special importance where old buildings are concerned.

Fixings which may be accommodated include stud projections, threaded inserts, eyebolts for safety harnesses, scaffold ring bolts, remedial wall ties and other fixing systems for which selection of adaptors are available.