Specialty Products Design Mandrel U-Bend 4 Inch Radius Mild Steel
Mandrel-bent U-bends preserve the tube’s round profile through the full arc, giving custom builders consistent geometry for clean header routing. Without mandrel support during bending, tubing wrinkles at the inner radius and collapses at the outer wall – restricting exhaust flow and creating stress points that crack under heat cycles.
Key Features
- Mandrel-bent construction maintains consistent outside diameter through the full 180-degree bend – no wall thinning, wrinkling, or oval deformation at any point in the arc
- The 4-inch centerline radius offers a moderate sweep for header runs with comfortable frame and engine clearance; this family also includes a 3-inch OD option for larger-diameter exhaust configurations.
- Available in 4 outside diameter options within this family: 1-3/4 inch, 1-7/8 inch, 2 inch, and 3 inch
- Clean as-formed mild steel surface accepts MIG and TIG filler rod without sandblasting or chemical preparation
- Sold individually – order the exact count required for your exhaust layout without committing to a multi-piece kit
Technical Specifications
- Material: Cold-rolled mild steel
- Wall Thickness: 0.060 inch (16 gauge)
- Bend Type: 180-degree U-bend, mandrel formed
- Centerline Bend Radius: 4 Inch
- Available OD: 1-3/4 inch, 1-7/8 inch, 2 inch, and 3 inch
- Surface Finish: As-formed bare mild steel (no coating, paint, or plating)
Fitment Notes
- Fabrication-grade raw bends for cut-and-weld installation – professional welding equipment and experience are required for proper installation
- Verify your header tube outside diameter before ordering; nominal OD must match your tube stock for consistent wall contact at weld joints
- No flanges, brackets, bungs, or end caps included – sold as individual formed bends only
- Bare mild steel will oxidize after installation; apply ceramic coating, header wrap, or high-temp paint to protect the finished exhaust system
Reviews
There are no reviews yet