براغي رأس أسطوانية M20-2.5 × 120 مم | رأس مسطح محرك سداسي | جزئية الخيوط | فئة 12.9 سبيكة فولاذ أكسيد أسود حراري (25/عبوة)

The 12.9 alloy steel feels seriously rigid—these threaded in clean without a hint of binding on my fixture plates. Partial threads are just right for clamping thick jigs, and the black oxide is holding up well after a few weeks of shop use.

The black oxide finish on these screws looks great and resists wear well in my jig setup. Although they are partially threaded, the flat head sits flush and the hex drive grabs securely without stripping during install. A solid choice for heavy-duty tooling where you need exact fit and strength.

These bolts mated perfectly with the M20 die I was using, and the black oxide finish gives them a clean, professional look. The hex socket drive makes it easy to get good torque without stripping the head.