Self-tapping screw mfd. by cold rolling - has specified ratio between outer and core dia. and between outer dia. and pitch

摘要

The self-tapping screw is formed by cold rolling and has a 1.2 ratio between its outer dia. (d1) and core dia. (d2). The ratio of outside dia. to pitch (P) is 2.9, and the flank angle (alpha) is around 40 deg. the screw pref. having a single start thread. USE/ADVANTAGE - For plastics etc., with high quality thread tapping, without dust or swarf formation.