Cannot imagine any H&S necessity (notwithstanding the risk of something failing because it had been incorrectly torqued) however there could easily be some Quality Management System issues. If there is an ISO9001 certificate 'in play' then calibration of measuring equipment is likely to be a requirement.

Hi Diesel

Don’t think you’ll find any legislation directly concerning torque wrench calibration per se; however as other have mentioned ISO may required calibration of such devises, or if fasteners must be correctly tightened for safety reasons then a risk assessment may require that torque wrenches use to perform this task are calibrated.

smitch

All equipment should be suitable and sufficient for its purpose inclusive of torque wrenches and the like as there is noting worse that something failing because of the nuts being improperly fixed - some people do not know the difference between different bolt types never mind other engineering areas

I do not think that there is anything written down in law which addresses specifically a torque wrench but PUWER will cover it so it does not need to be covered elsewhere ------- If you read about the history of boiler explosions you will see just how important correct engineering practices are

If this is not your specialist area get support from a 'proper' engineer ASAP as tightening up a high pressure steam flange is completely different to tightening up a low pressure heavy oil feed valve abet they should both be tightened in a 'fit for purpose' way by a competent person

Do torque wrenches come with Certificates of Calibration when you but them new, I wonder. Not really my area of expertise but I am conscious that say, a thermometer is likely to come with a certificate of calibration and will be required to be checked against a calibrated authorised device on a frequency that reflects its use.This to ensure that it remains within acceptable tolerances during its lifetime. UKAS certification houses do this (or it can be done in house with the appropriate equipment and training). This would all be covered by PUWER.

As boblewis has said if the nuts are safety critical then some evidence of their integrity would surely be required.