M22-2.5 x 320mm 內六角螺絲 | 六角驅動 | 部分螺紋 | 12.9 級合金鋼 熱處理黑氧化物

The hex socket drive made torquing these down in tight spots a breeze, and the 12.9 alloy steel feels seriously solid under load. They seated perfectly in my jig setup with no thread binding. Exactly what I needed for the machinery repair.

The black oxide finish on these M22 bolts looks professional and resists fingerprints well during assembly. The partial threading makes aligning them in jigs much smoother than fully threaded alternatives. They feel solid at 12.9 grade, exactly what I needed for tooling.

I needed heavy-duty fasteners for a custom jig and these M22 socket caps handled the load without any flex. The thermal black oxide finish looks clean and seems to resist surface rust well.