براغي رأس أسطوانية M20-2.5 × 55 مم | محرك سداسي | ملولبة بالكامل | فولاذ سبائكي فئة 12.9 مطلي بالزنك (25/عبوة)

I've been using these socket cap screws on a heavy-duty machining fixture, and the 12.9 grade alloy steel holds up really well under stress. The zinc plating on them looks clean and hasn't shown any rust after a few weeks in a slightly damp shop. They threaded smoothly into pre-tapped holes without

I needed fully threaded bolts for a jig assembly and these M20s fit perfectly without any extra machining. The zinc coating looks clean and even, and they threaded smoothly into my pre-tapped holes.

The hex socket drive on these M20 screws grabbed my wrench perfectly without any slippage, and the zinc plating looks clean and durable. They threaded smoothly into my machine base with zero binding, exactly what I needed for a sturdy jig assembly.