Screw thread refers to a continuously raised portion of a helical shape and of a specific cross-section made on the surface of a cylindrical or conical base. It is a shape with uniform spiral bulge on the external or internal surface of the products. It has the functions of tightening, connection and sealing, suitable for mostly used screw products.
Classification of screw threads
Threads can be divided into cylindrical threads and conical threads according to their parent shape.
According to its p
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