| 摘要 |
PURPOSE: A coupling member having a burr slot is provided to raise coupling intensity of coupling members by preventing a gap derived from burr of an opposite coupling member when combining coupling members, such as a screw nail and a bolt, with each other. CONSTITUTION: A coupling member has a burr slot. A screw nail includes a head part(41) having a hemispheric shape, and a body part(42) inserted into an opposite coupling member. A lower side of the head part(41) making contact with the opposite coupling member(45) has the burr slot(44). Accordingly, when the screw nail having the burr slot(44) is coupled with the opposite coupling member(45), burr(43) formed on the opposite coupling member(45) is closely inserted into the burr slot(44) so as to prevent a gap between the screw nail and the opposite coupling member(45).
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