The characteristic of the cup head square neck Bolt is that the head is made into a semicircular ball, and a section of square neck is made under the head. A section of square hole shall also be made on the connected part connected with this bolt. When the bolt is inserted into the connected part and the nut is screwed on, the bolt will not rotate because of the square neck. Its head is relatively smooth, and it is not easy to hook other objects. Cup Head Square Neck Bolt,Carriage Bolts,Round Head Square Neck Bolts,Cup Head Square Neck Bolts Jiangsu Jiajie Special Screw Co., Ltd , https://www.jiajiescrewcompany.com
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Metal hard seal butterfly valve manufacturers special valve years of production experience