Calculating Torque Needed for M20x100

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Calculating the torque needed for an M20x100 bolt is complex and depends on several factors, including joint design, load, number of fasteners, and required bolt pretension. The formula for torque is not straightforward, as it varies based on the specific application and conditions. Reference materials like Machinery's Handbook provide detailed guidance on this topic. It's essential to consider the bolt rating, coating, and lubricant used, as these can significantly impact torque values. Therefore, there is no universal answer, and each situation must be evaluated individually.
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if i have M20x100 how many torque is needed?
Could you explain to me its formula?
 
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(This thread belongs in Engineering - hint to moderator ;) )
My copy of Machinery's Handbook 26th Edition, pp 135 and 1475-1491 go through all of this. I'd suggest that you go to a library or consult your own copy of any edition.

The reason is: the application itself, the bolt rating, bolt coating, and lubricant can change the values.
 
Hint taken!
 
This is not a simple question to answer. There is no right answer for all situations. The answer depends on:

- The joint design
- The joint load
- The number of fasteners involved
- The pretension required in the bolt
 
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