Q: What is the standard angle of a metric flat head screw?

A: Metric flat head screws have a standard angle of 90 degrees. This is stated in the metric DIN standard DIN963 for flat head phillips and slotted flat head screws. Also, the standard angle for metric flat head socket cap screws per DIN7991 for M3-M20 sizes is 90°. Flat head socket cap screws in metric sizes M22 and M24 will have a standard angle of 60° according to DIN 7991.