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| Torqued figures - where do they originate https://www.ausmini.com/forums/viewtopic.php?f=2&t=78696 |
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| Author: | FNQ [ Wed Oct 03, 2012 1:54 pm ] |
| Post subject: | Torqued figures - where do they originate |
Hi Reading a fellow member's misfortunes due to a poorly calibrated torque wrench ( commiserations) picqued my interest. Torque settings - Are these derived from mathematical formulas, settings based on metals/thickness used , trial and error, etc - how does the factory produce the specs? Interest value only Cheers |
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| Author: | drmini in aust [ Wed Oct 03, 2012 1:59 pm ] |
| Post subject: | |
There are recommended maximum torque figures for all threaded fasteners- based on thread size form & pitch, and fastener's steel spec. The material it is threaded into (eg steel or alloy) varies the torque figure that can be applied. |
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| Author: | sam_1100 [ Wed Oct 03, 2012 3:47 pm ] |
| Post subject: | |
Torque settings are found from a combination of the bolts size and the preload required for the joint, which itself is found from a combination of the thread stress area, the bolts proof strength (eg a 10.9 bolt has a proof strength of 830Mpa) all multiplied by a certain preload factor eg 0.75. |
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| Author: | FNQ [ Wed Oct 03, 2012 3:59 pm ] |
| Post subject: | torqued |
excellent answers thank you |
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