M20-2.5 X 140mm 內六角螺絲 | 平頭六角驅動 | 部分螺紋 | 10.9級合金鋼熱處理黑色氧化 (10 / 包)

The partially threaded length saved me a ton of setup time on my jig—I could bolt through the fixture without extra spacers. The black oxide finish looks sharp and the hex socket took my torque wrench without stripping.

The hex socket seated perfectly on my driver with zero wobble, and the thermal black oxide finish looks like it'll shrug off shop grime for years. These M20s are replacing some lesser bolts on a jig I use daily, and the partial threading gave me just the grip I needed on the clamp plate.

The 10.9 alloy steel is noticeably tougher than the standard screws I’ve used before. These flat head screws are holding my new machine fixture perfectly, and the black oxide finish gives them a clean, professional look.