The purpose of a torque wrench is used to apply the correct amount of force when tightening a fastener such as a nut or bolt. A torque wrench allows the operator to measure the torque applied to the fastener so it can be matched to the specifications for a particular use.
Torque wrenches are essential in applications where the tightness of a screw or a bolt is crucial. Frequent applications of torque wrenches include the automation industry (ensuring the correct tightness of vehicle wheels bolts for example).
Preset torque tools are used when the same amount of torque is required to be applied to a fastener each time.
Calibrated scale torque tools have a visible scale that allows an adjustment to be made at a desired torque setting. This tool is ideal for use in areas where a range of different torque settings need to be applied.
There are several types of torque wrenches and each type is available in many different sizes and designed to suit a wide range of torque specifications:
- Click torque wrenches – make a loud “click” noise when the specified torque is reached. Over-torque conditions are possible with this style of torque wrench due to the fact that the click occurs around 3 degrees after the specified torque is reached
- Break torque wrenches – indicate the specified torque has been reached by deflecting 20-90 degrees on delivery. This restricts the amount of torque applied and it is unlikely that over tightening will occur
- Slip torque wrenches – prevent over-torque by sending a signal when specified torque is achieved and then released a short time later. Even if the application of force is repeated, the preset torque value will not be exceeded, therefore making it impossible to over tighten the fastener
- Beam type torque wrenches – are the style of torque wrench that is used most frequently in industrial applications since they are most affordable and simple to use of the various torque wrench types. A beam torque wrench has a long lever arm between the handle and the wrench head with a scale attached to it so the user can see the torque applied to the fastener. The user stops applying force when the desired torque has been reached.
To ensure accuracy of a torque wrench device and that torque specifications are met during manufacturing processes, a calibration programme is essential.
If calibration isn’t performed on a regular basis, general wear and tear can have an effect on the internal workings of the torque wrench device, eventually leading to incorrect readings each time the torque device is applied.
Hitek technicians are highly trained and competent to perform calibration services across the UK from the Mobile Calibration Laboratory which goes direct to premises and provides effective on-site calibration.
Hitek also offer a 100 mile radius collection and delivery service to and from the calibration laboratory in Horsham, West Sussex.
Hitek can provide traceable calibrations to national and/or international standards or to manufacturer’s specification from 1 to 1000 Nm.
01403 243 535 | www.hitek.co.uk