Q: I don't know the fastening accuracy of my tool. How can I continue my torque calculation?
A: There is some degree of inaccuracy in all fastening tools, which should be taken into account when determining the appropriate tightening torque.
The accuracy of the fastening tool is usually provided by the manufacturer or retailer. The fastening tools and their level of accuracy (including the tool operator) are subject to specific classification criteria. If you don't know the tightening accuracy of your tool, the values ​​in this table may apply.
It is also important to remember that the difference in friction affects the final preload, and its effect on the final preload is usually greater than the impact on tool inaccuracy. Therefore, a cost-effective way to accurately tighten is to properly lubricate the fasteners.
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