Abstract
In this paper, involute profiles are used for the design of screw driver and screw heads instead of traditional straight line profiles to increase their load capacity and durability. New screw driver profiles have lower contact stress than traditional screw drivers due to the surface contact between screw driver and screw head. This enables the involute screw drivers to sustain higher load capacity than traditional screw drivers and reduce the material failure at the tip portions for both screw drivers and screw heads. Four different designs of screw driver profiles are provided for illustration.
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