M8-1.25 X 50mm 內六角螺絲 | 六角驅動 | 部分螺紋 | 12.9級合金鋼熱黑氧化物 (200入/包)

The thermal black oxide finish on these screws gives them a nice, uniform look, and the hex drive held up perfectly under high torque while building a custom jig. No stripped heads or wobble, even after tightening several in tight spots.

I needed class 12.9 strength for a jig I was building, and these screws torqued down without any sign of stripping. The partial threading made alignment much easier than fully threaded bolts would have.

The black oxide finish handled my greasy shop environment without a single rust spot after two weeks on a jig fixture, and the hex socket drive made tightening them in tight spots a breeze. The 12.9 alloy steel feels rock solid, and the partial threading grabbed perfectly when I needed a secure clam