Posted on 01/09/2015 By Norbar
Torque wrenches are common place across a variety of industrial processes, commercial garages and even homes wherever there is a precision assembly process utilising threaded fasteners. Considering their widespread use however, there remains a number of things that people get wrong or simply don’t know. Here Philip Brodey at Norbar Torque Tools highlights the top ten things to consider.
1. Storing your torque wrench
When a torque wrench is in regular use it does not need to be wound back. However, when storing a torque wrench for an extended period of time, users should always wind it down to the minimum scale setting and never to zero.
A fully loaded torque wrench, left in storage for a long period, can cause a ‘set’ in the spring, causing it to weaken over time. On the other end of the scale, by completely off-loading the spring, other components within the wrench may move fractionally relative to each other. When you re ...
Posted on 05/02/2014 By Norbar
If we asked a handful of maintenance engineers what exactly they are trying to achieve when they tighten a bolt, it’s likely that we’d receive a wide range of answers.
Strictly speaking, when we tighten bolts we’re trying to stretch the bolt enough so that the elastic tension within it clamps the assembly together. That’s right - it’s one that’s easier done than said!
In a perfect world we would always recommend measuring the tension in the bolt, as opposed to the torque, because the tension is what we really need to know. In the real world, torque is the simplest way of achieving control in threaded fasteners but it is only an indicator of the tension.
Unfortunately there is no cheap, easy, reliable way to directly measure tension in a bolt but application of known torque gives sufficient control in the majority of situations.
It is widely accepted that the majority of torque we put into a threaded fastener goes into overcoming friction in the assembly as only between ...