Engine Hood (Bonnet) Stamping Die

Hole Flanging (Extruded Hole) Die

Our hole flanging dies create extruded flanges around holes in sheet metal parts, increasing the engagement length for bolt threads and providing reinforced mounting points. Haoxinran delivers precision hole flanging solutions for automotive applications.

Hole Flanging Process

• Pre-Piercing: Small pilot hole pierced in the initial operation.

• Extrusion Forming: Material stretched upward around the hole to create a cylindrical flange.

• Thread Engagement: Increased wall thickness allows direct thread tapping without nuts.

• Consistent Quality: Uniform flange height and diameter across production runs.

Applications

Hole flanging is used on automotive mounting brackets, body panels, chassis components, and interior trim parts where threaded holes are required without separate nut welding or rivet nuts.

Haoxinran hole flanging dies reduce assembly cost and improve part integration.