M5-0.8 X 180mm 內六角螺絲 | 六角凹頭驅動 | 部分螺紋 | 12.9級合金鋼熱處理黑氧化物 (25個/包)

I needed a longer bolt for a custom jig setup and these 180mm screws fit the bill perfectly—the hex socket drive made installation straightforward even in tight spaces. The thermal black oxide finish looks professional and seems durable.

The black oxide finish gives these a nice, uniform look that resists smudging during assembly, and the 12.9 grade definitely feels sturdy when torqued down. Threads ran clean into my jig’s tapped holes without any binding, even at this length.

Had to order these twice because I underestimated how far 180mm actually reaches on my jig setup—the thermal black oxide finish looks sharp and hasn't chipped during assembly. Threads cut clean into my steel plate, though the partially threaded section meant I had to double-check my depth before tig