On the left we have a terminal that was crimped using a parallel-action tool, and on the right the bad terminatio from above. The bad one was crimped with the scissor style tool.


An interesting observance to make is the wire crimp width of the crimp band area on the paralle-action tool, and how smooth the insulation transition is on the left vs. the right.


On the inexpensive mid grade scissor style tool the wire crimp die is considerably thinner and makes a much narrower crimp band on the terminal. This is why the parallel-action tool (left crimp) will repeatably wind up at about 190 pounds of tensile force (exceeds NASA and Mil-Spec), and the one on the right varies between 60 pounds and 105 pounds of tensile strength depending on how well you execute the termination.


Attention to detail matters.