Bolt refers to a screw with a larger diameter. It can also have no head, such as a stud bolt. Generally, it is not called “stud” but “stud”.
High strength double head bolt grade 8.8 through thread stud grade 12.9 blackened full thread rod grade 10.9 full thread screw
It is used for the fixed link function of connecting machinery. Both ends of the stud bolt have threads, and the screw in the middle is thick and thin. It is generally used for mining machinery, bridges, automobiles, motorcycles, boiler steel structures, lifting towers, large-span steel structures and large buildings
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