M6 X 10mm 滾花杯頭內六角止付螺絲 | 合金鋼 (1000 顆/包)

The knurled cup points really bite into the surface, holding firm even under machine vibration. I used these for a jig fixture and didn't have to retighten a single one after the first run. Exactly the grip I needed for metal-on-metal clamping.

The hex socket drive made adjusting these in a tight spot on my CNC frame much easier than I expected. Having a full box of a thousand means I won't run out for a while, and the knurled cup point gives them a really firm hold without stripping.

Finally found a set screw that stays put even in high-vibration setups – that hex socket really lets you cinch them down tight without stripping. The knurled cup point digs in nicely on shafts, so no slipping under load.