Comments by "mpetersen6" (@mpetersen6) on "Best Wrench (ALLEN KEY)? Wera Hex Plus, Bondhus, Wiha, PB Swiss, Craftsman, Kobalt, Husky, Eklind" video.

@barelybear5489 Ball Ends are fine. As long as they are used for their intended purpose. If some hammer handed idiot misuses them he deserves the problems removing the broken end. Ball ends on stainless screws especially the smaller sizes pretty much are not going to be torque high enough to reach the yield strength on the wrench. Before I retired I worked on industrial centrifuges. These machines are all stainless steel with stainless fasteners on all parts aside from high stress areas such as retaining flanges that the back drive for the internal screw conveyor mounts to. A lot of the issues with Ball Ends can also apply to Tee Handles. The absolute worst screws with an internal hex to take out are Flat Heads. It's not the torque of the screw it's the taper of head locking in the countersink.
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My go to over the years has always been Bondhaus. They will fail. Just about anything will after all. And for pipes we used ones that had a short section maybe 1/4 to 1/3 the the length of the main section welded on at a 45° angle. This allowed more angle to get into tight spots and afforded a better grip when just using the main section.
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@xmbiedirt One thing I always found to help on the smaller flat heads is to use a punch and hammer to put a shock load on them. I suspect the reason that flathead lock down so well is the slight mismatch between the tapped holes and the countersinks. Let's say the pass holes have a +/- tolerance of .004"/.1mm and now if you are dealing with countersinks that got machined in a drill press or by hand those could be all over the place. And they can give your hand a tingle when they break loose. The job I retired from first we had machines that put all the rings on a piston in one operation. They had arms that would carry all 5 components in to place which would be clamped in place. The arms swing out and you put the piston in. Clamp releases. You pull the piston out and the cycle repeats. The arms where separated by thin plates with socket head flat screws retaining them. 1/4-28 or 10-32 iirc. Any time you took the plates apart for any reason you threw the screws away. Trying to reuse them was asking for trouble.
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Should have used high grade SAE and ISO screws. 304 stainless is weak. A 12.1 carbon steel vs an A2-70 stainless is about 175% higher torque rating. Also the rated torque of comparable ISO vs SAE is higher. An ISO thread in comparision has a finer pitch for a higher percentage of the cross section in comparision to SAE of equivilant diameter.
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