براغي رأس مقبس M5-0.8 × 50 مم | محرك سداسي | جزئي الخيط | فولاذ سبائكي فئة 12.9 أكسيد أسود حراري (400 / عبوة)

The partially threaded shank made installation into my jig much easier than fully threaded bolts would have. These M5x50mm screws held firm under torque testing with no sign of stripping.

Installed these in a jig I'm building, and the hex socket drive made tightening them down in tight spots so much easier. The black oxide finish looks clean and feels durable for long-term use.

The partial threading on these M5 screws makes them perfect for clamping down jigs without bottoming out, and the black oxide finish handles oily shop conditions well. I used them to rebuild a fixture on my mill, and the hex drive seated firmly without stripping. They're a solid upgrade from lesser