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Choosing the right adaptor

Choosing the right adaptor

When pull testing on site you never know what you might come across next.

The range of fixings, bolts, nuts and eyebolts is vast and each one needs the right adaptor to successfully test to see whether it is safe and secure.

That’s why Hydrajaws provide a range of testers and adaptors to cope with quite a number of scenarios.

Most pull testers will have a Hydrajaws M2000 which will cope with anything up to 25kN. Our M2008 is the heavy duty tester which will test up to 145kN. And in-between is our M2050 which will pull test up to 50kN whilst still remaining light and portable.


Hydrajaws adaptors are available for all testers and will be chosen to fit the fixing that is to be tested. This chart shows some of the main ones and the adaptor to be used:


They are set up as follows:

The M12 locking adaptor

The M12 Locking Adaptor fits into the tester and allows various adaptors to fit into the tester (eg the bolt adaptor.

The bolt test adaptor

For M16 nuts, the bolt tester adaptor (a) directly engages the nut (b) in the pulling jaw.

Bolt test adaptor


The slotted button adaptor

For testing fixings where a connection is made underneath the head of the fixing or anchor the slotted button adaptor is used. The slotted button adaptor (a) slots into the bolt tester adaptor (b) and engages the fixing (c).

Slotted button adaptor


The threaded button adaptor

For testing threaded fixings the threaded button adaptor is used. The threaded button adaptor (a) threads on to the fixing (c) and then slots into the bolt tester adaptor (b)


Threaded button adaptor

The clevis adaptor

For testing ringbolts the Clevis adaptor is used. Remove crosspin from the clevis adaptor and offer the tester and bridge to engage eye of the anchor in the clevis. Push clevis pin through the clevis and eyebolt, ensuring that the ball on the pin clicks into place, having passed through the second fork.

Clevis adaptor

Threaded stud adaptors

Suitable for testing sleeve and stud anchors. A suitable threaded rod (a) is screwed into the anchor and the adaptor (b) then fitted.

Threaded stud adaptors


Threaded rod adaptors

The M5 and M6 threaded rod adaptors are equipped with an external M12 thread for use in conjunction with the M12 threaded button adaptor. They are used primarily for testing remedial wall ties. The M8 and M10 threaded rod adaptors are equipped with an M16 external thread and the M16 nut fitted with connects to the pulling slot in the tester or bolt tester adaptor.

Connect the threaded rod adaptor complete with the M12 button adaptor to the thread on the fixing (fig 11)

Threaded rod adaptors


For more information on Hydrajaws adaptors and how to fit them – please see our Adaptors Instructions guide.


Hydrajaws Technical Advice

If a fixing location seems too unworkable then contact Hydrajaws and their technical team who will be able to suggest an appropriate adaptor or even an alternative bridge or setup.

Details of all testers and their manuals are available on the Hydrajaws website at:




Posted: 30/07/2019 07:45:30 by Hydrajaws | with 0 comments
Filed under: Accessories, Adators, guide, Hydrajaws