# Sheet-Metal K-Factor Bend Allowance & Flat-Pattern .DXF Tool

Calculate neutral-axis sheet-metal Bend Allowance (BA), Outside Setback (OSSB), Bend Deduction (BD), air-bend V-die tonnage, and flat-pattern .DXF layouts.

## Engineering Geometry & Export Specification
- Applies BA = angle*(R + K*T) and BD = 2*OSSB - BA with etched press-brake bend tangent lines exported on dedicated AutoCAD DXF layers.
- CAD Outputs: 0.005mm AutoCAD R12 `.DXF`, `.SVG`, Watertight 3D Binary `.STL` (4–40mm face + hub boss + bore), and `1:1` Printable `.PDF`.
- Pricing: Free Spec Proof PDF ($0) · Single CAD Pack ($11.90) · Mechanical Engineer Pro ($19.00/mo).
- Live Interactive Workbench: https://gearcadpro.com/templates/sheet-metal-bend-allowance-k-factor-calculator.html