M18-2.5 X 65mm 內六角螺絲 | 六角驅動 | 全螺紋 | 12.9級合金鋼熱處理黑色氧化 (25 / 包)

Used these on a custom jig I was assembling and they torqued down nicely without stripping. The black oxide finish gives them a solidly premium look compared to standard hardware I've tried.

Finally upgraded my press fixture build from grade 8.8 to these 12.9s and the difference in tightening feel is noticeable. The black oxide finish wiped clean easily out of the packaging and the hex socket drive held my Allen key without slipping.

Used a few of these to rebuild a jig fixture on my mill, and the 12.9 alloy steel held up perfectly under heavy clamping loads. The thermal black oxide finish looks great and seems to resist corrosion better than the plain steel ones I usually get.