5/8-11 X 4英吋 內六角螺絲 | 六角驅動 | 美國製造 | 合金鋼 熱處理黑氧化物 (140顆/包)

The hex socket drive seated perfectly on my torque wrench, and all 140 pieces came out of the box with a consistent, even black oxide coating. I used them to bolt down a heavy jig plate and they held rock solid.

The black oxide finish on these 5/8-11 x 4" screws looks uniform and feels durable, and the hex socket drive engaged perfectly with my driver on a tooling jig. No stripped heads or wasted time, which is exactly what I need for precision assemblies.

Finally, a batch of socket cap screws that are actually perfectly threaded all the way—no frustrating burrs or binding when I'm setting up a jig. The thermal black oxide finish looks great and seems to resist any surface rust in my shop.