M6-0.75 X 35mm 內六角螺絲帽 | 六角內驅動 | 部分螺紋 | 12.9級合金鋼 熱處理黑色氧化物 (400入)

I had to replace some fasteners on a jig at work, and these M6 screws threaded in smoothly without any binding. The partially threaded design gave me just enough grip for the clamping force I needed. They're definitely holding up well with no signs of wear.

The black oxide finish on these screws is incredibly consistent across all 400 pieces, which made them perfect for a precision jig I'm building. They drive smoothly with a hex key and hold torque beautifully.

Finally found properly hardened 12.9 screws for my jig builds—these didn’t deform under high torque like cheaper bolts I’ve tried. The black oxide finish looks clean and seems to resist rust in my damp workshop.