HOLO-KROME 730003340 3/4-16 X 7英吋 內六角螺絲 | 六角驅動 | 合金鋼 熱處理黑色氧化物 (10 / 包)

The black oxide finish is a nice touch—they don’t look like they’ll corrode anytime soon in my shop. Threads seated smoothly in the tapped holes for a fixture I’m building, and the 3/4-16 grip feels solid. Exactly what I needed for a precision assembly.

Used these to secure a heavy jig on a mill table and the threads engaged smoothly right to the full seven inches. The hex socket drive held up without any rounding even under our torque wrench.

The thermal black oxide finish wiped clean before install, and every one of the ten threads seated smoothly into my fixture plate. These are holding a heavy tooling setup with zero flex so far, exactly what I needed for the jig work.