Hexagonal nuts are used to tighten the bolts with wrenches with the help of the pins inserted into the bolts through the nuts.
Nuts are made of hot or cold rolled Q235B/45# steel/Q345B material in conformity with GB/T700-2006 or GB/T699-2015 standard.
Nuts are coated with about 275g/m2 zinc by electro galvanization.
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