How to top a suitable tightening torque

Update:10-11-2020
Summary:

Question: I don't know the tightening accuracy of my to […]

Question: I don't know the tightening accuracy of my tool. How can I proceed with the torque calculation?

Answer: All tightening tools have a certain degree of inaccuracy. This should be taken into consideration when determining the appropriate tightening torque.

The accuracy of the fastening tool is provided by the manufacturer or retailer. There are specific classification standards for fastening tools and their accuracy levels (including operators). If you do not know the tightening accuracy of your tool, you need to remember that the difference in friction will affect the final load, and the effect of his final preload is usually greater than the impact of tool imprecision. Therefore, a cost-effective, accurate fastening method is to properly lubricate the fasteners.

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