Thanks CoryPad and diamondjim. I had previously looked at FAT731-376. It was not clear if ASTM STP 1236 and 1391 included UNJ threads in addition to UNC and UNF threads. We have ASME B1.15-1996, so we have all the geometry for UNJ threads, but we do not have a way right now to determien fatigue...
Does anyone know where I can get thread fatigue data/curves for internal and external UNJ threads? The only data we have been provided by our customer is from the UK with no reference to thread type. Thanks in advance for the help.