Stainless steel torx drive CD vein micro screw for smart phones

Industry knowledge：

The origin of screws is not clear.
According to contemporary history, the first screw was made for a machine . Some say that the thread structure could only be imagined by a genius mechanicist like Archimedes.

Production method and development of standardization

1850s In Europe, the cold forging method Began to develop, a large number of interchangeable screws were made.

After the interruption of the World War II period, the International Organization Standardization (ISO) was established in 1947. and the international standardization was promoted even with screw standards. The “ISO metric thread” standard was enacted.