HOLO-KROME 72288 براغي رأس مقبس 5/8-11 × 4-1/2 بوصة | قيادة مقبس سداسي | فولاذ سبائكي بأكسيد أسود حراري (20 / عبوة)

These hex socket screws threaded cleanly into my jig fixture without any binding, and the 4-1/2" length was perfect for a heavy-duty assembly I was working on. The thermal black oxide coating seems much more durable than the plain steel ones I've used before.

The black oxide finish on these 5/8-11 screws looks flawless and the hex socket drive seated perfectly with my Allen wrench, no stripping at all. Installed a dozen into our fixture table and they torqued down smooth without any binding, solid purchase for the money.

Had to replace some bolts on a press jig, and these threaded in smoothly without any binding. The alloy steel feels sturdy, and the hex socket grabbed tight with no rounding.