براغي رأس أسطوانية M20-2.5 × 250 مم | محرك سداسي | ملولبة جزئيًا | فئة 12.9 من سبائك الصلب مع أكسيد أسود حراري (5 / عبوة)

The black oxide finish on these screws really helps them hold up in a dirty shop environment without rusting. The 12.9 alloy steel feels incredibly sturdy, and the partial threading made aligning my jig fixture much easier than a fully threaded bolt would have.

Used these for a heavy jig build and the Class 12.9 alloy steel held up perfectly under torque without any stretching. The partially threaded design made alignment in tight spots a lot easier than fully threaded caps I've tried before.

The black oxide finish on these M20 bolts is holding up nicely in my fixture setup, and the hex socket drive made torquing them down a breeze. Used them to replace older hardware on a press tool, and the 12.9 alloy steel feels solid.