1/2-20 X 4" 杯頭內六角止付螺絲 | 合金鋼 (50 顆/包)

Installed these in a tight jig setup and the full 4-inch length gave me just enough reach without needing a spacer. Cup point bit into the steel shaft cleanly on the first try.

The hex socket drive held up perfectly when I torqued these into a tight spot on my milling machine. All fifty screws came with clean threads and consistent cup points, which made the alignment job much smoother than I expected.

These 4-inch long set screws worked perfectly for aligning a heavy machine base where regular screws wouldn't reach. The cup point bites into the steel nicely and the hex socket gave me plenty of torque with an Allen key.