Self-tapping screw and method of making same

Details Self-tapping screw and method of making same Self-tapping screw and method of making same

B - Operations, Transporting

23

G

10/10, 10/3, 10/

B23G 9/00 (2006.01) B21H 3/02 (2006.01)

Patent

CA 1114565

SELF-TAPPING SCREW AND METHOD OF MAKING SAME ABSTRACT OF THE DISCLOSURE A self-tapping screw of the type including a head, a depending cylindrical portion, a tapered point and a thread running continuously from the cylindrical portion onto the tapered point and a method of making same are disclosed. A screw blank is formed with a constant diameter cylindrical shank, the lower end of which includes a de- pression or concavity. Cooperating, relatively moving dies including opposed faces defining a tapered slot within which the blank is received cut a continuous thread into the blank. The concavity in the blank permits the metal to flow more readily resulting in crisp threads and a significant increase in the life of the thread rolling dies. -1-

335247

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