براغي رأس كبس M42-4.5 × 110 مم | محرك سداسي | ملولبة بالكامل | فولاذ سبائكي فئة 12.9 بأكسيد أسود حراري

The threads are cut clean and the black oxide finish looks proper—no flaking or rough edges anywhere along the 110mm length. I've got them holding a jig together that sees constant vibration and they haven't backed off a millimeter after a week of use.

Torqued these down on a tooling fixture today and the hex socket took the full 12.9-alloy torque without stripping. Fully threaded 110mm length gave me just the right grip for a thick jig plate. Finish looks uniform and hasn't smudged a bit.

The black oxide finish on these M42-4.5 screws is flawless, and the threading feels precision-cut across the full 110mm. I used them on a heavy-duty jig and they seated perfectly without any wobble.