Nitinol Expansion Spring

Nitinol Expansion Spring

When cool, spring can be extended to 14 cm (5-1/2"). Heated, contracts to 29 mm (1-1/8") overall. With 350 gram hanging mass shrinks from 60 mm (2-1/4") long coil (cool) to 30 mm (1-1/8") long (heated) with 2 Amps. 6 mm (1/4") coil, 750 µm (.03") wire, activates at 45-55° C equivalent to (131-149° F). Use several in series for greater distance, or in parallel for greater force.

PDF Manual

Nitinol tension coil spring

Wire diameter 0.75mm (0.030in), mean coil diameter 5.55mm (0.22in), Alloy M

Analysis

• Wire diameter: 0.754 mm
• Mean coil diameter: 5.50 mm
• Total turns: 21.4
• Free length: 26.8 mm
• Austenite finish: 51.5ºC
• Nickel: 55.36%
• Titanium: Balance