M3 X 4mm 滾花杯端內六角止付螺絲 | 合金鋼 (1000 / 包)

The knurled cup point really digs in and holds tight, even on softer metals where other set screws just spin. I used these for a small robotic joint and the hex socket made installation a breeze in the tight space.

The hex drive handled my high-torque tightening perfectly without stripping, and the knurled cup point tip provides a much more secure grip than standard screws. These M3s are exactly what my assembly jig needed.

The knurled cup point grips the shaft way better than standard set screws I've used before, so no more slipping under vibration. For a thousand pieces at this price, the alloy steel feels solid and the hex drive worked perfectly in some tight spots.