| 摘要 |
A thread forming screw configured for insertion into relatively hard plasti cs includes an elongated core region having two ends, a head at one end and a point at the opposite end, a helical thread extending generally radially from the core region, the thread being asymmetrical when viewed in a cross-section taken through a diameter o f the 5 core, the thread defining a flank angle made up of a leading angle, facing the point, and a trailing angle facing the head, the leading angle being greater than the trailing angle. |
