Low resistance anti-crack screw structure

Abstract: a low resistance anti-crack screw structure, including a low resistance screw comprising an upper section of screw, a middle section of screw, a lower section of screw, and a cone-shaped screw tail. the lower section of screw is recessed with at least one chip ditch that gradually becomes deeper from top to bottom. the chip ditch is tilted with respect to the central axis of the low resistance screw and has a chip removal angle between 10 degrees and 20 degrees. the second ditch section is inclined relative to the radial direction having an incline angle between 79 degrees and 89 degrees, and the maximum depth of the second ditch section is less than 55% of the radius of the lower section of screw. the lower side of the chip ditch is tapered close to the screw tail and has a drag reduction angle between 15 degrees and 20 degrees.

Inventor(s): Rick Wang, Chun-Ting Tu

CPC Classification: F16B25/0052 ({the ridge having indentations, notches or the like in order to improve the cutting behaviour})

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