براغي رأس كبسولة M5-0.8 × 55 مم | محرك سداسي | ملولبة جزئياً | فولاذ سبائكي فئة 12.9 مؤكسد أسود حراري (300 / عبوة)

I needed a batch of strong bolts for a jig I'm building, and the 12.9 alloy steel on these feels incredibly sturdy. The black oxide finish looks professional and seems durable enough for repeated adjustments under pressure.

Installed a full set of these in my new tooling fixture, and the 12.9 alloy steel held up perfectly under repeated clamping. The black oxide finish has a nice, uniform look that resists smudging.

Used a dozen of these for a jig I’m building — the 12.9 alloy steel feels way tougher than the standard stuff I’ve used before, and the black oxide finish handled a few drops of cutting oil without any rust. Fit perfectly into pre-tapped holes, too.