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By certification 
Jiangsu Zhenya Special Screw Co.,Ltd is one of the leading China heavy hex nuts manufacturers and suppliers, as a professional company, our productive factory is able to produce CE certification heavy hex nuts at both high quality and low price. Welcome to buy discount and cheap, or wholesale products from us.
Heavy hex nuts are slightly larger and thicker than standard hex nuts. There are numerous grades and the heavy pattern is typically used for large diameter and high strength bolts.
