M27-3 x 180mm 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 (5/包)

The hex socket drive seated the Allen key perfectly, no wobble or stripped edges even under full torque. The black oxide finish has a consistent, matte look that fits right in with my tooling setup, and the 12.9 grade gives me confidence these won't shear on the press.

Used these 180mm screws for a heavy jig build—the hex socket drive made tightening them in tight spots much easier than I expected. Thread engagement felt solid and precise right out of the box. Definitely glad I went with the 12.9 alloy steel for this job.

The thermal black oxide finish on these screws held up perfectly during assembly—no chipping or galling at all. I used them for a custom jig setup, and the hex socket drive made tightening much easier than a standard hex head.