M24-3 x 55mm 內六角螺絲 | 平頭內六角驅動 | 全螺紋 | 12.9級合金鋼熱處理黑氧化 (10/包)

The black oxide finish on these looks proper, not just cosmetic, and the hex socket seated the driver perfectly with zero wobble. Class 12.9 is the real deal for a jig I’m building, and the thread engagement was clean all the way down. These are staying in my fastener kit from now on.

I needed some high-strength fasteners for a jig I'm building, and these M24-3 x 55mm socket cap screws fit perfectly. The hex socket drive seated firmly with my Allen key, and the black oxide coating gives them a clean, professional look. They feel solid and well-made for this kind of precision work

The black oxide finish on these M24-3 screws is holding up perfectly in my jig setup, no chipping after repeated tightening with a hex key. They threaded smoothly into pre-tapped holes and the 55mm length was just right for my application.