براغي رأس سداسي 2"-4-1/2 × 7" | درجة BD فولاذ سبيكة عادي | ملولبة جزئياً (1 / عبوة)

Needed a heavy-duty bolt for a press repair and these hex heads fit the bill perfectly. The partially threaded shaft grabbed tight without any wobble, and the Grade BD alloy steel feels solid enough for repeated high-torque work.

Spent the afternoon rebuilding a hydraulic press frame and these hex heads bit into the alloy steel without a single stripped thread. The partial threading gave just the right grip for the deep clamp load I needed.

Driving these into steel beams for a conveyor repair, the partial threads grabbed cleanly without binding halfway. Heat-treated alloy steel took the impact wrench torque without snapping or stripping.