براغي رأس مقبس 3/8-24 × 4 بوصة | رأس مسطح محرك سداسي | فولاذ سبائكي أكسيد أسود حراري (50/عبوة)

The flat head sits perfectly flush in my counterbores, and the black oxide finish was consistent across all fifty screws. These handled the torque for my press tooling without a single stripped drive.

I used these for a custom jig setup, and the hex socket drive made installation straightforward even in tight spaces. The 4-inch length was perfect for securing thicker material, and the black oxide finish has held up well without rust.

The black oxide finish on these screws is a nice touch—they slide into the hex driver without any stripping, even after a few hours of tightening down fixture plates. All fifty came out of the box with clean threads and no burrs.