M14-2 X 170mm 圓柱螺絲 | 六角驅動 | 部分螺紋 | 12.9級合金鋼 熱處理黑氧化物 (25 / 包)

Been using these in a heavy milling fixture for a few weeks now, and the Class 12.9 strength handles the torque without any issue. The black oxide coating on the partially threaded shank has held up well against cutting fluids and chips.

Installed these in a jig fixture I’m building and the hardened black oxide finish feels grippy and tough. The 12.9 grade holds torque beautifully, and the partially threaded shank lined up perfectly for my application.

These M14-2 x 170mm cap screws are a perfect fit for my jig setup—the hex socket drive made tightening in tight spots a breeze. The 12.9 alloy steel feels incredibly solid, and the thermal black oxide coating gives them a clean, uniform look that also resists oil smudges on the bench.