M3-0.5 X 60mm 內六角螺絲 | 六角驅動 | 部分螺紋 | 12.9 級合金鋼 熱處理黑氧化物 (100 入)

The black oxide finish has held up perfectly through repeated assembly and disassembly in my jig setup, no flaking or rust spots. The hex socket bites cleanly every time, and the 12.9 alloy steel feels seriously rigid—these are going to last.

The partial threading on these 60mm screws gives me just enough grip depth for my tooling setup, and the black oxide coating hasn't shown any wear after a week of use. A solid choice for precision work.

I needed longer M3s for a jig I'm building, and these 60mm ones fit perfectly. The hex socket drive engages cleanly with my driver, no stripping so far. 4 stars because I wish the package had a few extra spares.