M24-3 X 150mm 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 (10個/包)

Put them into a tooling fixture yesterday, and the 12.9 grade steel really holds up under torque without stripping. The partially threaded shaft gave just the right grip length for my application.

The black oxide finish on these M24 screws looks flawless under the workbench light, and the hex socket drive seated perfectly on my torque wrench without any wobble. I've already used four of them on a heavy-duty jig and the 12.9 alloy steel feels reassuringly tough.

The hex socket drive seated perfectly on my driver with zero wobble, and the black oxide finish feels properly oiled out of the bag. These 12.9-grade screws handled the jig clamping torque without a hint of strip, which is exactly what I needed for the precision assembly.