# Material selection

| Property | Value |
|---|---|
| Alloy | Aluminum 6061-T6 |
| Spec | ASTM B221 / AMS 4117 (reference) |
| Yield (typ.) | 276 MPa |
| Density | 2.70 g/cm³ |
| Why selected | Machinability, corrosion resistance, strength-to-weight for light duty bracket |
| Rejected | 7075 (overkill cost), mild steel (weight + finish), polymer (creep under clamp) |
| Stock | 50 × 50 × 6 mm bar, mill to 3 mm legs |