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Robert LaLonde
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Ball end are very handy. However, and I am sure somebody will disagree, the square ends will lock up a little better when you really have to twist on one. That being said, if you really have torque on a fastener get out your L handle set or your socket drive set. I've got so darn many hex keys its nuts.
A little trick. When you have to really torque on a fastener go through all your hex keys that are close and find the one that is the absolute tightest fit, but still goes in without pounding on it. Do not torque on it with one that's "close enough." I have an tire drawer full of hex keys along with several full sets around the shop. Some just work better for some jobs than others. They are not all perfectly consistent from one to the next. Neither are the machine screws.
A little trick. When you have to really torque on a fastener go through all your hex keys that are close and find the one that is the absolute tightest fit, but still goes in without pounding on it. Do not torque on it with one that's "close enough." I have an tire drawer full of hex keys along with several full sets around the shop. Some just work better for some jobs than others. They are not all perfectly consistent from one to the next. Neither are the machine screws.