Calculating Torque Needed for M20x100

[miloziz]

if i have M20x100 how many torque is needed?
Could you explain to me its formula?

 

[jim mcnamara]

(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.

 

[HallsofIvy]

Hint taken!

 

[FredGarvin]

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