M6-1 X 50mm 圓柱頭螺絲 | 平頭六角凹槽驅動 | 部分螺紋 | 10.9 級合金鋼 熱黑氧化物 (300 入/包)

Needed some fasteners for a jig build and these M6s were exactly the right length and pitch. The 10.9 alloy steel feels substantially stronger than the standard hardware store stuff.

The black oxide finish looks clean and professional on my jig setup, and the hex socket drive makes installation quick even in tight spots. These feel solid enough for heavy-duty tooling work, no stripped heads so far.

I needed a bunch of these for a custom tooling fixture, and the black oxide finish held up perfectly against minor chips and coolant splashes. The hex socket drive felt precise and didn't strip during tightening, just what you want for repetitive assembly work.