Metric hex nuts are a type of fasteners with a threaded hole that is used for fastening to a bolt or screw when mechanically joining materials together.The two parts are kept together by a slight stretch of the threads as the nut and bolt are torqued and pressure is applied to the bolt threads. Also a split ring lock washer may be used to lock the nut in place. Metric hex nuts are also used with flat and fender washers. Metric hex nuts are available in both coarse and fine thread.
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