M30-3.5 X 240mm 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

Used a set of these for a custom jig build and the black oxide finish held up perfectly against the metal shavings. The hex socket drive made installation with an Allen key effortless, and the Class 12.9 alloy steel feels incredibly sturdy for the price.

Finally got around to swapping out some worn bolts on a press fixture. The black oxide finish slid right into the tapped holes without any binding, and the hex socket drive seated perfectly with my torque wrench.

The black oxide finish on these M30 screws is flawless and the partially threaded design made alignment in my tooling fixture much easier. They drove in smoothly with a hex key and feel incredibly solid. Very happy with this purchase.