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# Torque capacity of flange

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## Torque capacity of flange

(OP)
I want to find design specifications and theory for the design of a coupling flange.....in terms of thickness I need to make the flange.

Can someone lead me to a site or reference to determine the torque capacity of a 2" thick (mild steel) 15" O.D plate with twelve 5/8" Dia bolts (grade 8)

My goal is to torque 14,000ft-lbs
I did a study on the shear of the bolts and it should take the load with good factor of safety.

Im just unsure of the plate failing (Too bad machine shop only has mild steel!!!)

Any help is much appreciated.

John

### RE: Torque capacity of flange

Hi jhowai

To solve your problem you need to consider the bearing failure of the plate.You do not mention on what pitch circle
diameter your bolts are on, which is important in order to
determine the force generated on each bolt by the torque.
If you divde the 14000ftlbs by half the pitch circle diameter and then divide that result by 12, that will give you the force on each bolt.Now with the force in each bolt
known you can calculate the bearing stress on the steel plate using the formula:-

F/(d x t)= bearing stress in plate

where F= shearing force on each bolt

d = diameter of bolt

t = thickness of coupling plate

The bearing stress that is calculated above should be less
than the allowable bearing stress for the plate material.I have assumed that the bolts are not close to the edge of the coupling outside diameter and that the bolts are seperated sufficently to avoid tearing of the plate between
bolts.

hope this helps

desertfox

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