M5-0.8 X 15mm 內六角螺絲 | 平頭 六角驅動 | 全螺紋 | 等級 12.9 合金鋼 熱處理黑色氧化 (600 顆/包)

The flat heads sit perfectly flush in my jig plate, and the hex socket gave a clean bite on the first turn. For precision work like tooling, these M5s feel incredibly sturdy.

Pulled these out of the bag and the hex drive seated perfectly on my first try, no wobble at all. For 600 pieces at this price, the class 12.9 hardness gives me serious confidence for jigs and fixtures.

The black oxide finish on these has held up without a speck of rust through weeks of shop use. The hex socket drive seats cleanly and the threads cut smoothly into my fixture plates every time.