M6-1 x 145mm 內六角螺絲 | 內六角驅動 | 半牙 | 12.9級合金鋼熱處理黑氧化物 (50顆/包)

I needed longer screws for a jig I was building, and these 145mm ones worked perfectly for the deep access holes. The hex socket drive made installation straightforward with a standard Allen key.

The black oxide finish looks properly applied, no flaking or uneven spots anywhere on the 50 pieces. Threads cut smoothly into my steel fixture with the hex socket biting perfectly, and the 145mm length was exactly what I needed for the through-hole alignment.

Installed these on a custom jig I’m building and the hex socket drive makes tightening them into tight spots way easier than using a hex key on a bolt. The black oxide finish also seems to resist oil and grime better than the plain steel ones I usually buy.