HOLO-KROME 61020 براغي رأس مقبس 1/4-28 × 5/8 بوصة | رأس مسطح بمحرك مقبس سداسي | فولاذ سبائك معالج حراريًا بمؤكسد أسود (100 / عبوة)

I've used a lot of these black oxide screws for jigs and fixtures over the years, and this batch had a consistently clean thread fit across the whole package of 100. The flat head sits flush without any wobble, which is exactly what I need for precision assemblies.

The socket drive seated perfectly in my Allen wrench, no stripping even when I torqued them down on my jig. Used about thirty on a precision fixture and every one threaded smoothly with zero binding.

The black oxide finish on these screws is flawless—every single one in the pack threads cleanly into my tooling fixtures without any binding. For a hundred pieces at this price, they’re a solid deal for precision work.