Norbar’s torque wrench extension calculator is now available as an app to download free on iPhone and Android. An invaluable tool for engineers, the torque extension app calculates the exact torque wrench setting value for required level of torque to be applied.
When you put an extension on a torque wrench (e.g. a crow foot or a dog bone) the torque applied to the fastener increases as the lever arm extends. The calculator will work out what value you should set into the wrench to achieve the required fastener torque (to view the torque extension calculator on our website, you must have Java enabled on your web browser).
The following formula has been used:
- M1 is the torque setting of the wrench.
- M2 is the actual torque applied to the nut
- L1 is the normal length of the wrench
- L2 is the extended length of the wrench
While we have done our best to test this programme, we cannot be responsible for errors or damages that result from its use. You must verify that the values obtained from the calculator are accurate before using them in any critical application.