براغي رأس أسطواني 1-1/4-7 × 12 بوصة | قيادة سداسية | خيط جزئي | فولاذ سبائكي أسود حراري

Used these for a jig I built and the partially threaded design held perfectly under load. The black oxide finish feels durable and hasn't chipped during assembly.

The hex socket drive made tightening them into my jig a breeze, and the partially threaded design held the workpiece rock-solid. These 12-inch screws feel hefty and precise, exactly what I needed for a heavy machinery setup.

The black oxide finish on these screws provides just enough grip for my tooling fixtures without feeling sticky, and the 12-inch length was perfect for a deep assembly I was working on. I've used cheaper bolts before, but these alloy steel ones held torque much better under heavy clamping pressure.