Internal thread tensile strength

  • Thread starter rmf17
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calculation of internal thread tensile strength

Hi All!
I've got a coupling device that has two internal threads of different pitch, length, diameter. The smaller thread takes a lifting bolt, the larger attaches to a piece of machinery.
I've been asked to work out the safe working load (SWL) limit of the coupling. I have the lifting bolt and thankfully it is stamped by the manufacturer and so I've been able to easily calculate it's maximum lifting capacity.
What I need help with is working out the maximum load that can be applied on the internal threads of the coupling device in pure tension.
To make it harder I don't yet know the material of the device or the thread and pitch of the largest internal thread, but I'm working on it!
Can anyone suggest a good method for the calculation? It does not need to account for shear forces, pre-load or torque. The coupling is hand tightened and lifted purely along it's axial line.
 

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