Torque Moment (for mechanical anchor)

Hi Thuyet Trinh Thi,

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The values for tightening torque printed in the fastener assessment reports will not alter with static, seismic, fire, or fatigue design and the Engineer simply needs to follow the minimum spacing and edge distance values in the assessment report (ETAs & ESRs) while designing a fastening, as these derive from the fastener’s installation torque. If the fastener is installed and torqued to the correct value per the ETA or ESR, the Engineer can rest assured that the fastener will perform as it was designed at Ultimate and Serviceability Levels.

As an example please see below the setting details of a HST3 wedge anchor derived from the assessment report.


If you would like to know more about torque and it's impact to post-installed fasteners (e.g. mechanical anchors), you can refer to this expert article that was written by our Regional Fastening Expert.

Thank you very much and we hope that this answers your question. If you have additional question on this topic, please continue to post it here in Ask Hilti.

Best regards,

Ask Hilti Team
South East Asia.