Why we have a varity of heads beause we have to meet all client requirements.
The thread of the screw is different. There is a triangular tooth self-tapping locking screw. It has the same pitch and angle as the metric thread, but the section is a triangle, with D and C values 2 parameters that control the locking.
Solutions to the problem of unstable output of dispensing machine, small skills and normal operation methods of dispensing machine.