براغي رأس سداسية M5-0.8 × 50 مم | رأس مسطحة محرك مقبس سداسي | ملولبة جزئيًا | فولاذ سبائكي درجة 12.9 بأكسيد أسود حراري (200 / عبوة)

The black oxide finish on these screws held up perfectly in my precision assembly setup with no chips or scratches. They seated cleanly with a hex driver, and the 50mm length was exactly what I needed for this machinery rebuild.

Used these to build a custom jig for my milling machine and the 50mm length gave just enough bite for thick steel plates. The partially threaded shank lets them hold tight without stripping.

Machined some fixture plates over the weekend and these M5s seated cleanly in the holes, even with the partial thread grabbing exactly where I needed it. The black oxide finish feels tough and didn't chip during tightening with the hex key. Package of 200 gives plenty of spares for the shop.