براغي رأس مقبس مقاس M27-3 × 280 مم | محرك سداسي | ملولبة جزئياً | فولاذ سبائك فئة 12.9 أسود حراري

Was a bit concerned about the partially threaded length for my application, but it worked perfectly as a stop bolt on a press fixture. The black oxide finish feels durable and hasn't chipped during installation.

Pulled these out of the box and was surprised by how smooth the threading feels—no burrs at all. They seated perfectly in a tooling fixture I'm building, and the black oxide finish looks clean and durable.

Installed these in a heavy jig assembly and the hex socket drive made tightening much easier than a standard hex head. The 280mm length was exactly what I needed for the through-hole application.