Clevis and lug design - Peterson's

The chart was incorrectly annotated which caused some confusion. This has been corrected in v1.2.

I think you have hit on something here Henk. I'll have to go back and check things over to make sure it works when c does not equal H/2. I post up a new version when I have had time to correct it. It is worth noting that the shear stress is simply a reference stress in the calculation and does not effect the stress concentration factor which is the focus of the calculation. However thank you for your fresh pair of eyes. Your feedback is very useful and much appreciated.

There are a few I think the simplest to use is Pin and Lug.xls this is a traditional UK railway engineers method. The method is extended for fatigue design in Pin and Lug - Static and Fatigue.xls
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There a good aerospace industry method to be found in Aerospace_lug_analysis.xls.
An offshore industry method is presented in API PADEYE Design.
I hope this helps.

In response to the comment:
"I am sorry, but shouldn't the moment for simply supported be PL/4 not PL/8?" Posted by: psuarez Jan.26
No the calculation is correct as the pin is assumed to be simply supported and the load is uniformly distributed (PL/4 would be true if all the load was concentrated at the centre of the pin). Thanks.

thekal there is nothing wrong with the calculation but you most likely need to install the XLC addin which can be downloaded from this site (follow the 'Main Menu'). At the top of the spreadsheet it does actually say that you need to install XLC if you get #NAME errors. Hope this helps