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Clamping Force non-joint

Clamping Force non-joint

Clamping Force non-joint

(OP)
i was wondering how i would determine a bolts clamping force, or the amount of tension in the threads when the bolt is screwed into a flange.  there is no washer or nut.  the bolt is directly screwed into the part.

RE: Clamping Force non-joint

Is there anything between the bolt head and the flange?  If so, you have a joint - one with a tapped hole, which is very common.

If you don't have anything clamped between the bolt head and the flange, then you have the equivalent of a threaded plug.  This can develop tension in the threads, or very commonly, shearing of either the bolt threads or the flange threads.

Regards,

Cory

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RE: Clamping Force non-joint

(OP)
no there isn't anything between the bolt and flange.

yes this is a threaded plug.  would i just use the normal T=KDP formula to dermtine the clamping force/tensile force?

RE: Clamping Force non-joint

Is this the same, or different than your gland thread?

RE: Clamping Force non-joint

It depends on the joint geometry.  Is there a significant unengaged shank length?  Almost assuredly not.  If you have a short screw going into a tapped hole, then this configuration has nonuniform force distribution throughout.  This isn't suited to easy calculation.  Plus, this type of joint is notorious for large torque/tension variation during assembly due to the unfavorable bolt to joint stiffness ratio and the small rotation angles involved.

Regards,

Cory

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RE: Clamping Force non-joint

(OP)
yes it is.   

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