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Application filed by John Wagnerassociates IncfiledCriticalJohn Wagnerassociates Inc
Priority to TW96105232ApriorityCriticalpatent/TW200833961A/en
Publication of TW200833961ApublicationCriticalpatent/TW200833961A/en
A self-drilling screw capable of engaging with a metal plate having plywood thereon is provided. The self-drilling screw has only one wing or two wings asymmetrically formed on the screw. Such design can prevent the cutting edges of the screw from being stripped out as a result of heat resulting from that the cutting edges rub against the metal plate during drilling. The plywood on the metal plate is also not to be ignited.