M30-3.5 x 240mm 소켓 머리 볼트 | 육각 소켓 드라이브 | 부분 나사산 | 클래스 12.9 합금강 열처리 블랙 옥사이드

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.