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I’m doing a “Systematic calculation of highly stressed bolted joints – Joints with cylindrical bolt“ according to VDI 2230 Part 1. In step of calculation R11 “minimum length of engagement”, when my internal thread is critical, I have to calculate the ratio of $s/d$.

In my specific application I’m using a tapped thread joint (TTJ) and I’m connecting some kind of tube (internal thread) with a threated bolt. And because my tube is thin-gauged I get a small $s$ and therefore my ratio $s/d$ is smaller than $1.4$.

VDI 2230 only considers ratios greater than $1.4$ and here my questions arise:

  • What is the effect on my calculation when I’m out of the mentioned ratio-borders?
  • Is it possible to compensate the effect?
  • What’s the amount of error I’m introducing?
  • ...

Okay, I could reconstruct my connection – but that’s not the topic of my question.

Thanks in advance for your help.

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