M10-1.5 X 55mm 內六角螺絲 | 平頭、內六角驅動 | 部分螺紋 | 12.9 級合金鋼、熱處理黑色氧化 (100個/包)

The black oxide finish on these socket screws looks great and held up perfectly during assembly of a custom machine guard. The partially threaded design made alignment a breeze in my fixture setup. Exactly what I needed for a heavy-duty jig.

Used a handful of these in a jig I’m building, and the black oxide finish feels tough and the threads caught cleanly without galling. They’re 12.9 grade, so I’m not worried about them snapping under load, though the heads sit a little proud if you’re countersinking.

The hex socket drive on these M10 bolts makes installation easy with just an allen key, and the black oxide finish seems durable enough for my jig setup. For the price, getting 100 pieces of class 12.9 alloy steel feels like a solid deal for precision work.