5/8-11 x 5/8" 滾花杯端內六角止付螺絲 | 合金鋼（50個/包）

The knurled cup point really grabs and holds the material tightly, which is exactly what I needed for my jig setup. They're sturdy enough to handle repeated adjustments without rounding out.

The hex socket drive made seating these in a tight spot under the machine frame a breeze, and the knurled cup point dug in firmly without stripping. All 50 pieces arrived with clean threads, and they’ve held their torque setting through a full week of vibration. Exactly what I needed for a stubborn

The knurled cup point grips way better than the smooth set screws I've used before, and the hex socket makes it easy to get torque on them even in awkward spots. These are solid for the price, especially since you get 50 in the package.