براغي رأس أسطوانية 1/2-13 × 2 بوصة | محرك سداسي منخفض الرأس | خيط كامل | فولاذ سبائكي مؤكسد حراري أسود (50 / عبوة)

The black oxide finish on these screws held up perfectly against the cutting oil in my milling machine, no rust after a full week of use. They threaded smoothly into my fixture plate without any binding.

I needed these for a jig I was building and the alloy steel with black oxide finish seems plenty tough so far. The hex drive seated each screw firmly without any stripping, which was my main worry.

Installed these in a jig for a drilling fixture and the low head profile gave me just enough clearance under the guard. The hex drive seated firmly with no stripping, and the thermal black oxide coating looks clean and resists rust. Worked perfectly for the price.