براغي رأس أسطوانية مقاس 3/4-10 × 6-1/2" | محرك سداسي | صناعة أمريكية | فولاذ سبائكي بأكسيد أسود حراري (30 / عبوة)

These bolts torqued down perfectly on my jig fixture without stripping—the hex socket drive really grips the Allen key securely. The black oxide finish has a nice, even texture that seems like it'll resist rust better than the zinc-plated ones I've used before.

Finally found a proper 6.5" length in this diameter; the hex socket drive feels solid and the black oxide coating looks uniform across all 30 screws.

Was skeptical about the thread finish but these seated cleanly into my jig plate with no binding, and the black oxide looks properly done. The hex socket drive took a good amount of torque without stripping, which is exactly what I needed for a heavy fixture.