As bolting specialists the question we are often asked is "what torque do I apply to my bolts?"

This is a loaded question and surprisingly difficult to answer. As a fastener is tightened it is influenced by many factors, but by far the most noticeable in the torque/load comparison is lubrication.

Not satisfied with general 'theoretical calculations' a series of Christie Bolt Analyser (CBA) machines were built to enable the practical testing of fasteners to help give customers with critical applications a unique insight into the behaviour of their bolted joints.

The CBA is able to test a wide range of bolts (M16 - M56) accurately comparing torque and load during the tightening process. This process is carried out using a torque transducer and a hollow load cell monitoring both torque and load simultaneously via CBA computerised software.

It is invaluable to be able to assess the various torques required to achieve the same load, changing the lubrication coefficient. A major UK bolting manufacturer appreciate the value of this information and frequently send random samples of bolts to Christies for testing, to prove their integrity to clients working with critical torque/load tolerances.

Ensure the safety of your installation and the integrity of your bolts, call Christie to discuss in more detail the reasons to utilise the CBA service centre.