318 Water Pump Bolt That "Always Wants to Leak" Story

You are not gonna wear out threads, BUT they can rust and deteriorate, they can be overtightened and damaged, especially if one that had been in there was too short. Thread chasers/ taps are always good to have. There are three popular types of taps, and many hardware stores don't know squat. A "normal" tap is often characterized as being a 'starting' tap as it is somewhat tapered. A plug tap is straight all the way, and a "bottom" tap as the name implies, is able to tap closer to the bottom of a hole