Hey guys! So tell me...what is the UN series thread all about? What makes it different from other threads? Why can't I find taps in my KBC catalog? Seems the auto industry uses this thread for tie rod ends. Any idea why? I did a google search for this and found a few tidbits but nothing to explain the ins and outs. Any info on internal 7/8 X18 UNS thread cutting on a lathe? Thanks in advance!