Tag » Torque control


According to “Brake”, the road safety charity, runaway wheels kill 8 to 10 people and cialis generic impotence kamagra viagra viagra injure many more each year in the UK.

Naturally, as a torque solutions provider and torque tool manufacturer this is very concerning and our fear is that the issue is not given its due attention by the road haulage and public service vehicle industries where speed and low cost often seem to be the most important factors in wheel bolting.

It’s very important that maintenance engineers know that wheel nut movement indicators and nut locking devices are no substitute for good bolting practice, including the correct application of torque to wheel bolts.

Plastic wheel nut movement indicators can be applied to commercial vehicles, such as articulated lorries and buses, to indicate movement in the wheel nut.  Many commercial vehicle users also apply nut locking devices which link two or more adjacent nuts in such a way as to prevent them from undoing.

Wheel nut movement indicators are an excellent warning system to visually alert a driver, buy cheapest viagra transport manager or mechanic that there is a potential problem with the wheel nuts.  Equally, locking devices can serve a purpose in helping to retain the initially applied torque.

However, the indicators and locking devices are not a substitute for good bolting practice which includes ensuring that the threads are undamaged, clean and free from rust and paint.   Vehicle manufacturers’ recommendations for thread lubrication should be strictly adhered to and the correct torque should be applied using a calibrated torque tool.

We regularly come across situations in both car and heavy vehicle garages where the wheel nuts are over tightened with an impact wrench before the torque wrench is applied for the final tightening.

We would always recommend that wheel nut movement indicators should only be fitted once this good practice has been applied.  The same is true of locking devices but they should not be used as a substitute for the regular wheel nut re-checks that are required by law.

Philip Brodey, Sales and Marketing Director, Norbar Torque Tools


The importance of setting the correct torque when assembling equipment cannot be overemphasised. If you need an example of how important it is to set torque at precision accuracy, you actually need look no further than the common bicycle.

Old ‘bedstead’ bikes were generally easy and quite inexpensive to fix and an over torqued bolt might result in a stripped thread, simply requiring a trip down to the local bike shop or ironmonger.

However, those days are long gone and cheap and easy maintenance is a thing of the past because a revolution has taken place in the materials used in cycle manufacture. Heavy steel frames and components have been replaced by aluminium, carbon fibre, titanium and ultra-thin section steel tubing.

Bikes that are as light as those currently ridden in the Tour de France, such as one of Mark Cavendish’s specialised Venge  bikes, are now within reach of amateur racers and keen leisure cyclists – note the next cyclist you see when stopped at a set of traffic lights.

Today’s bikes have the required torque stamped on their critical components. Clamping down too hard on carbon bars will crack them but insufficient tension in the bolts may result in the bars moving in the clamp. A torque wrench is becoming an essential component in the cyclist’s maintenance kit! Long gone are the days of the Penny Farthing – the correct application of torque is vital to engineering performance when it comes to bicycles.

At Norbar we demand the same consistent levels of quality and accuracy when manufacturing a 200 Nּm Norbar torque wrench as we do in the production of more specialised equipment. All of our tools are designed and manufactured in house and supplied with traceable calibration certificates. Accuracy and traceability help us to ensure that internationally recognised standards of quality and reliability are maintained for equipment used worldwide and across every industry sector – whether on a deep sea pipeline or a Trek Madone 6 Series.

By Philip Brodey, Sales and Marketing Director


The week of Coach & Bus Live at the National Exhibition Centre, Birmingham, England (you can visit us at stand K35) is an appropriate time to be addressing the issue of torque control in coach and bus applications.  Torque control of threaded fasteners can have a significant impact on the efficiency of a vehicle, but more importantly it can play a very significant role in terms of safety.

The road safety campaigners, BRAKE, call loose wheels from vehicles ‘bouncing bombs’ and while Barnes Wallis coined the phrase for an entirely different application, the end result can still be catastrophic.  It is estimated that ‘runaway’ wheels from vehicles kill 8 to 10 people and injure many more each year in the UK.

For example, a few years ago a van driver was killed on the M2 Motorway in Kent, England when a wheel detached itself from a truck and struck his vehicle.  This is not an isolated case and it highlights the fact that the correct wheel nut torque can have life or death implications.

The fact that technicians servicing and maintaining coaches and buses need to be skilled is a given.  Crucially, however, employers need to be able to prove through correct procedures and documentation that a job was carried out correctly.  In any kind of product liability claim it is not sufficient for the employer to claim that all their technicians are highly trained and are capable of doing the job.

One way of ensuring accurate torque in commercial vehicle workshops is to use pneumatic torque multipliers rather than a traditional impact wrench.  The reason for this is that impact wrenches, which are not torque controlled devices, require the torque to be checked using a manual torque wrench.  The torque wrench check will only correct under-tightened nuts and so frequently nuts can be left over-tightened.  A pneumatic torque multiplier like the Norbar TrukTorque™ undertakes accurate torque tightening in a single process.

A video on how to use a pneumatic torque multiplier can be found on the Norbar Youtube channel at http://www.youtube.com/user/TruTorque#p/u/7/Ib8dH4az1Dg

By Philip Brodey, Sales and Marketing Director