براغي رأس أسطوانية M12-1.5 × 70 مم | محرك سداسي | ملولبة جزئيًا | فولاذ سبائكي فئة 12.9 مؤكسد أسود حراريًا (50 / عبوة)

I needed some high-strength fasteners for a jig I'm building, and these 12.9 alloy steel cap screws fit the bill perfectly. The 70mm length was just right for my application, and the partially threaded design made alignment much easier.

The black oxide finish on these screws held up perfectly during assembly of a custom jig, no chips or flaking. Thread engagement felt smooth all the way down, and the 12.9 grade gives me confidence in high-stress applications.

Put these into a hydraulic press fixture I'm building, and the black oxide finish really helps prevent galling against the hardened steel plates. The 12.9 grade feels rock solid even under heavy tension.