DIN7500d st ezn M4x20 /1000 zelftappende zeskantflenskopschroef pz

DIN 7500 thread forming screws form their own "female thread" in ready-made holes by thread-rolling into malleable material.
The resulting thread corresponds to standard metric thread.

Advantages:
- thread-cutting becomes unnecessary
- no play in the mating threads
- high vibration resistance
- no chips