براغي رأس مقبس M4-0.7 × 18 مم | محرك مقبس سداسي | خيط كامل | فولاذ سبائكي درجة 12.9 مؤكسد أسود حراريًا (900 / عبوة)

The black oxide finish on these screws is holding up perfectly in my precision assembly setup, no rust or wear after repeated adjustments. Torqued them down with a hex key and the socket drive engaged cleanly without stripping—exactly what I needed for tight spots.

Used these to replace hardware on a jig fixture and the black oxide finish cleaned up nicely without any residue. The 12.9 grade steel feels noticeably sturdier than standard screws I've worked with.

Got a full box of these for a jig I’m building, and the hex socket drive made driving them into tight spots painless—no stripped heads at all. The black oxide finish feels properly grippy too. Solid value for a 900-pack that’s clearly meant to hold up in real use.