HOLO-KROME 720000290 #5-40 X 5/16" براغي ذات رأس مقبس سداسي | محرك سداسي المقبس | فولاد سبائكي مع أكسيد أسود حراري (100 / عبوة)

The black oxide finish on these screws looks great and held up perfectly during assembly of a small precision fixture. They seated cleanly with a hex driver and the threads were crisp—no binding or galling at all. Exactly what I needed for this tooling job.

Used a full pack of these on a jig I'm building and not a single one stripped or rounded out, which is more than I can say for some cheaper hardware. The black oxide finish has a nice uniform look and the alloy steel feels properly heat-treated. For a hundred pieces at this price, they're the kind o

The drive sockets fit snugly on my hex key with zero wobble, and the black oxide finish looks even better up close on the machine jig I’m building. Threads started cleanly into the tapped holes, so no fighting or cross-threading on the first few pieces.