براغي رأس سداسية داخلية M36-4 X 360mm | محرك سداسي داخلي | خيط جزئي | فولاذ سبائكي درجة 12.9 أكسيد أسود حراري

I’ve been using these for a heavy jig assembly and the partially threaded design made alignment a lot easier than I expected. The hex socket drive seated cleanly with a standard Allen key, and the black oxide coating hasn’t chipped despite some rough handling.

Installing these M36-4 x 360mm screws into my fixture jig went smoothly; the hex socket drive grabbed perfectly even with the 360mm length. The thermal black oxide finish looks consistent and feels durable, not brittle. Solid fasteners for heavy tooling.

Finally, some hardware that can handle the torque on our heavy-duty jig without bending. The 360mm length and class 12.9 alloy steel make these perfect for the precision assembly I needed. A bit pricey, but the thermal black oxide finish should keep them from corroding in the shop.