براغي رأس مقبس M3-0.5 × 50 مم | محرك سداسي | ملولبة جزئيًا | فئة 12.9 سبيكة فولاذ أكسيد أسود حراري (200 / عبوة)

Thread engagement feels precise and clean, and the black oxide finish resists smudging better than I expected during assembly. These are perfect for jig work where a reliable grip matters.

For a 200-pack of precision fasteners, these 12.9 alloy steel screws are surprisingly consistent—every one threading cleanly into my jig without any wobble. The partially threaded design gives just the right grip depth for the 50mm length.

The black oxide finish is holding up beautifully on my jig fixtures, and the hex socket drive gives a solid, no-slip grip with my Allen wrench. I've used a dozen so far and every thread cut clean into the alloy steel without any stripping.