Calculating Torque Needed for M20x100

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Discussion Overview

The discussion revolves around calculating the torque needed for an M20x100 bolt, exploring the factors that influence this calculation. Participants seek to understand the relevant formulas and considerations involved in determining the appropriate torque for various applications.

Discussion Character

  • Technical explanation, Debate/contested

Main Points Raised

  • One participant inquires about the torque required for an M20x100 bolt and requests an explanation of the formula.
  • Another participant suggests consulting the Machinery's Handbook for detailed information, noting that factors such as application, bolt rating, coating, and lubricant can affect torque values.
  • A later reply emphasizes that the question is complex and context-dependent, listing several factors that influence the torque requirement, including joint design, joint load, number of fasteners, and required pretension in the bolt.

Areas of Agreement / Disagreement

Participants acknowledge that there is no single answer to the torque question, indicating a general agreement on the complexity of the issue. However, multiple competing views on the factors involved remain present.

Contextual Notes

The discussion highlights limitations related to the variability of torque requirements based on specific conditions and assumptions that may not be fully articulated in the thread.

miloziz
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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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