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The size of flange nut and general hex nut is basically the same as the thread specification, but compared to hex nut, it is a one-piece gasket and nut, and there are anti-skid teeth underneath, which increases the nut and workpiece Compared with the combination of ordinary nut and washer, it is stronger and more tensile.
DIN 6927 - 1983 Prevailing Torque Type All-Metal Hexagon Nuts With Flange
The domed surface protects the bolt threads underneath while providing a finished appearance and may improve safety in certain circumstances.
DIN 6334 metric hex nuts have a height of 3 x the major diameter of the thread.
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