HOLO-KROME 32216 1/2-13 X 5/8" 杯端內六角止付螺絲 | 合金鋼熱處理黑氧化物 (100個/包)

Needed a few to secure a shaft coupling on a small gearbox, and these cup point screws bit in just right without stripping the hex drive. The black oxide finish should keep them rust-free in the shop environment for years.

Bag arrived neatly packed in a hundred-count box, and the threads are clean with no burrs. Used them to lock a pulley onto a motor shaft, and the hex socket drive made install a breeze.

The cup point bites into the shaft exactly as it should, and the black oxide finish makes them easy to handle even with oily fingers. Opened the package and all 100 were clean, no burrs or debris. These are the ones I'll order again when I run low.