براغي رأس مقبس M20-2.5 × 120 مم | محرك سداسي المقبس | ملولب جزئيًا | فولاذ سبائكي درجة 12.9 أكسيد أسود حراري (10 / عبوة)

Pulling these M20 screws tight into a tooling plate, the hex socket drive engaged perfectly without any stripping. The black oxide coating looks clean and should resist rust in my shop.

Installing these in a jig fixture today and the hex socket drive engaged perfectly with no wobble. The 12.9 alloy steel feels seriously tough, and the black oxide finish looks great on the bench.

The partially threaded design on these M20 screws made all the difference for my jig build—plenty of clamping force where needed. They threaded in smoothly without binding, and the black oxide finish looks great against the steel. Exactly the heavy-duty fasteners I needed for tooling work.