WOOD SCREW FOR PLYWOOD FOR FLOOR AND FLOOR FASTENING CONSTRUCTION

摘要

PROBLEM TO BE SOLVED: To enable the improvement of the earthquake resistance in a wooden building using the most suitable wood screw for a plywood for a floor.;SOLUTION: An outer screw 2 is formed at an front end side of a shaft 1 by form rolling using a steel wire containing boron. A dish-lile head 3 is formed at the rear end, and after the form rolling, is subjected to carbonizing/tempering.;COPYRIGHT: (C)2005,JPO&NCIPI