M8-1 X 40mm 內六角螺絲 | 六角驅動 | 部分螺紋 | 12.9級合金鋼熱處理黑色氧化 (200顆/包)

The partially threaded design makes seating these in a jig a breeze, and the black oxide finish handled a bit of shop grime without a speck of rust. The hex socket drive took my torque wrench without any stripping, even at the higher end of spec. These are going straight into my permanent tooling st

The partially threaded design made aligning them in my jig so much easier than fully threaded bolts. They seated perfectly with a hex key and feel incredibly solid for the price.

The black oxide finish on these screws looks professional and resisted scratching when I tightened them into my jig frame. Threads ran smooth all the way down without any binding.