براغي رأس أسطوانية HOLO-KROME 72254 1/2-13 × 5-1/2 بوصة | محرك سداسي | فولاد سبائكي مع أكسيد أسود حراري (25 / عبوة)

The black oxide finish on these socket cap screws held up perfectly against the oil and metal shavings in my shop press rebuild. Threads cut cleanly and seated flush with no binding. Exactly what I needed for heavy-duty fixture work.

Needed a dozen for a jig I was building and these threaded in cleanly with no binding. The alloy steel feels solid, and the 5-1/2 inch length gave me plenty of grip in the assembly. Exactly what my tooling needed.

The black oxide finish on these screws held up well when I tightened them into my steel fixture, no chips or flaking at all. Used them to secure a heavy clamping block and the hex socket drove true without stripping.