براغي ذات رأس أسطواني M10-1.5 × 65 مم | رأس مسطح محرك سداسي | ملولبة جزئيًا | فئة 10.9 فولاذ سبائكي مع أكسيد أسود حراري (100 / عبوة)

The threading is clean and the hex socket bites perfectly—no stripped heads on the first dozen I’ve used for jig frames. The black oxide looks uniform and holds up to clamping pressure without flaking.

I was a bit worried the black oxide finish would rub off during installation, but it held up perfectly on my tooling fixture. The partially threaded section made alignment much easier than fully threaded bolts.

I needed some sturdy bolts for a jig I'm building at work, and these class 10.9 alloy steel screws feel incredibly strong and the black oxide finish looks clean. The hex socket drive made installation easy with a simple allen key, and the partial threading was perfect for my application.