مسامير رأس أسطوانية M24-3 × 140mm | محرك سداسي | ملولبة جزئياً | فولاذ سبائكي فئة 12.9 مطلي بالزنك (10 / عبوة)

The partially threaded design is exactly what I needed for clamping workpieces on a drill jig, and the zinc coating on these Class 12.9 screws gives them a clean, corrosion-resistant finish. They drive smoothly with a hex key and hold up well under repeated tightening.

The threads are clean and precise, and the zinc coating has held up well in my tooling setup. These bolts offer great holding power for the price.

Installed these in a heavy jig at work and the 12.9 alloy steel held up perfectly under full torque without any deformation. The hex socket drive fit my wrench snuggly with zero stripping.