M4-0.7 X 12mm 內六角螺絲 | 低頭六角驅動 | 全螺紋 | 10.9級合金鋼熱處理黑氧化 (400個/包)

Ordered these for a jig I'm building and the 12mm length fits perfectly into my drilled holes without any slop. The hex socket drive grabs cleanly with my allen key, and the class 10.9 strength gives me confidence they won't strip under load.

The black oxide finish on these is really clean and uniform, made them easy to handle with a hex key without slipping. Great fit for my jig assembly since the low head profile sits flush in tight spaces.

Needed a batch of high-strength fasteners for a jig setup and these were exactly the spec I ordered, the black oxide coating looks even better in person. Threads are clean and consistent across all 400, so no chasing or binding when driving them in.