The Steel Company of Canada, Limited

George K Masuda

This invention provides a self-drilling screw and a method of making the screw. The screw comprises a shank tapering to a substantial point at one end, a head on the other end, at least one spiral thread, and a flat facet on the point end, the facet being at an angle to the axis of the screw. The method of making the screw includes the steps of heading and roll-threading a blank to provide a screw having a head, a point, and at least one spiral thread, and grinding a flat facet on the point at an angle to the axis of the screw. In a preferred form, the screw is surface-hardened either before or after the grinding.

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Hamilton, Canada

George K Masuda