HOLO-KROME 61024 براغي رأس أسطواني بمقبس سداسي مقاس 1/4-28 × 1 بوصة | رأس مسطح، محرك سداسي | فولاذ سبائكي، أكسيد أسود حراري (100 / عبوة)

The black oxide coating on these screws held up perfectly during assembly—no galling or stripping when torqued into hardened steel. Threads cut cleanly and seated flush in my fixture. Exactly what I needed for a precision tooling project.

Used a full pack of these on a jig for a production run and every single screw threaded clean without a single stripped head. The 1/4-28 grip on the hex socket feels snug, and the black oxide held up fine against coolant splashes. Exactly what I needed for tooling work.

The black oxide finish on these is uniform and slick, not patchy like some sets I've had. Threads are clean and the flat heads seat flush every time, so they're perfect for jig plates and fixture builds.