Patent ID: 6572316
Filing Date: 2003-06-03
Classification: F16B,Y10S

Abstract:
A screw with a thin head comprising a screw head (2) in which a recess (10) coinciding with a driver bit that transfers driving force is formed and a shank (4) which is integrated with and a thread portion (3) is formed on, featuring a circular arc of a comparatively large radius formed on the head top (5); an unthreaded part (20) with larger diameter at a bottom of the head and smaller diameter at an upper end of the thread; which is tapered down between a bearing surface (6) and the threaded portion (3) of the shank (4); a radius (21) with a curved surface at a sectional view along almost one pitch of thread, which is formed at an end of the unthreaded part (20) of the shank in such a way as to be directly connected to the thread portion (3) preventing stress concentration from occurring herein at and after the fastening of the screw.