... Hex bolt is most widely used kind of bolts, it has the outer thread's main function is to cooperate with the ... Using this thread connecting methods, make two parts fucked. • Applications:main service in the petrochemical industry, food machinery, construction decoration, solar ... on other countries and area. WENZHOU HOWLS FOREIGN TRADE CO.,LTDRm.1106,Digital Mansion,No.140,Xincheng Road,Wenzhou,Zhejiang ...