I have had two exact same size/pitch bolts and several nuts will thread on the one and none will go on the other until I chase it's threads. It's the plating/finish on the bolt. You end up taking it off and probably exposing it to corrosion. But I don't want to go back to the store so I do it. I have always used my regular taps and dies to chase threads and have never had a problem with that. Never really understood the reason for special chasers. I always take off the handle when unscrewing the die/tap so as not to damage my good job I just did with too much unthread wobble. I would seriously try to get a set of dies that are hex. It's real handy to use your sockets sometimes in tight places and they will NEVER slip in the handle.
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn |