براغي ذات رأس مقبس M36-4 × 170 مم | محرك مقبس سداسي | ملولبة جزئياً | فئة 12.9 من سبائك الصلب مؤكسد أسود حراري

I needed a high-strength fastener for a heavy jig I'm building, and the 12.9 alloy steel on these screws feels incredibly solid. They threaded cleanly into the tapped hole without any binding, which was a relief for such a large size.

These bolts fit perfectly in my milling jig—the Class 12.9 alloy steel is seriously tough. The hex socket drive made installation straightforward with my Allen wrench.

The black oxide finish makes them slide into tapped holes without any galling, and the 12.9 alloy steel feels rock solid under torque. I used them on a fixture table and they seated perfectly with no thread binding. Exactly what I needed for heavy-duty work.