M2.5-0.45 X 4mm 內六角螺絲 | 圓頭內六角驅動 | 全螺紋 | 10.9 級合金鋼 熱處理黑色氧化 (600 顆/包)

The hex socket on these is cut clean and deep, so the driver bites every time without slipping. The black oxide finish looks uniform across all 600 pieces, and the 10.9 grade gives me confidence they'll hold up in my fixture builds.

Finally, a tiny screw that actually holds tight in jigs and fixtures without stripping. The black oxide coating seems durable and the threads are crisp, so they start cleanly even in tight holes. A solid six hundred pieces for the price, and I’ve already used half for tooling builds.

The hex socket drive grips the Allen key perfectly without any stripping, and the black oxide finish gives them a clean, uniform look across all 600 pieces. I’ve used them in a few precision assemblies so far and the Class 10.9 strength feels solid, threading smooth and consistent every time.