Drive configuraiton

A drive configuration adapted to be formed on a fastening assembly, said fastening assembly including a first working unit and a second working unit adapted to engage with or separate from said first working unit, with a screw defined as said first working unit and a driving tool defined as said second working unit, wherein said screw includes a head, a bearing surface formed on said head, and a socket recessedly formed in said bearing surface, said socket including a bottom portion distal from said bearing surface and an entrance portion joined to said bearing surface, said driving tool including an end portion adapted to be inserted into said socket;

• and
• wherein said drive configuration defines a central axis axially applied to said fastening assembly and comprises a plurality of operating regions and a plurality of driving regions, a plurality of engagement regions being each extended between every two adjacent operating regions, said plurality of operating regions and said plurality of engagement regions being formed between said bottom portion and said bearing surface, a plurality of fitting regions being each extended between every two adjacent driving regions, said plurality of driving regions and said plurality of fitting regions being formed on an outer periphery of said driving tool;
• wherein each said fitting region of said driving tool has a single arc wall provided with a single radius, a surface of each said operating region of said screw including a base wall, a first socket side wall formed on a first side of said base wall, and a second socket side wall formed on a second side of said base wall, a surface of each said engagement region including a main arc wall provided with a radius, a first engagement arc wall connected to a first side of said main arc wall, and a second engagement arc wall connected to a second side of said main arc wall, said first engagement arc wall being provided with a radius and extended to said first socket side wall of one operating region of said every two adjacent operating regions, said second engagement arc wall being provided with a radius and extended to said second socket side wall of the other operating region of said every two adjacent operating regions, said radius of said first engagement arc wall being equal to said radius of said second engagement arc wall, said radius of said main arc wall being different from said radius of said first engagement arc wall and said radius of said second engagement arc wall, each said engagement region of said screw thereby being in the form of a three-section arc structure, a first distance being defined from said main arc wall to said central axis, a second distance being defined from said base wall to said central axis, said first distance being shorter than said second distance;
• and
• wherein when said screw and said driving tool are engaged with each other, each said operating region of said screw touches each said driving region of said driving tool, and said first engagement arc wall and said second engagement arc wall of each said engagement region come into contact with each said fitting region of said driving tool, each said engagement region thereby intersecting with and engaging with each said fitting region to create two engagement points, thereby applying torque caused by said driving tool to said head efficiently.