HOLO-KROME 72316 براغي رأس مقبس 3/4-10 × 3 بوصة | محرك مقبس سداسي | فولاذ سبائكي مع أكسيد أسود حراري (25 / عبوة)

Used a few of these to secure a fixture on a milling table, and the black oxide finish hasn't shown a single spot of rust yet. The hex socket seated perfectly with no stripping, even under decent torque. They feel solid for precision work.

I’m rebuilding a jig for a production line and these 3/4-10 x 3" cap screws threaded in cleanly with zero binding, even with the thermal black oxide coating. The socket drive gripped tight with my hex wrench, and the alloy steel feels solidly machined—no burrs or rough threads. Exactly what I needed

The black oxide finish on these is flawless, and the hex socket drive made installation a breeze with my torque wrench. They’re solid alloy steel through and through, exactly what you want for a precision fixture I’m building.