Approximate values for metric fine threads VDI 2230
Download full chapter: preload and tightening torques
The details are based are based on VDI 2230, edition 2015: prestressing forces and tightening torques for headless screws of strength classes 8.8 to 12.9 for a 90 % utilisation of the yield point Rp 0,2.
The table does not include any factors of safety and assumes the user is familiar with the design criteria.
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