# 420 Go-Kart & Mini-Bike Chain Sprocket Laser .DXF Studio

Create laser-ready AutoCAD R12 .DXF files for 420 pitch (1/2 x 1/4 in) go-kart, drift trike, and mini-bike axle sprockets with mounting bolt circles.

## Engineering Geometry & Export Specification
- Uses exact 12.70mm pitch and 7.772mm roller diameter for 420 racing chains with clean closed polylines for fiber laser and waterjet tables.
- 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/go-kart-420-sprocket-laser-dxf.html