| 摘要 |
A screw is provided to maintain strong fastening force by forming a female thread on a fastening member of an object with less torque when driven to the object. A screw comprises a head(10) in which a screw driver is inserted, a fastening part(20) extended from one side of the head and in which a screw thread(22) is formed in order to be inserted into a fastening member of an object, and a screw forming part(30) in which a screw thread(32,34) is formed continuously from the screw thread of the fastening part, where the angle of the screw thread is smaller than that of the fastening part in order to form a female thread on the fastening member of the object.
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