NiTi Shape Memory Spring - 20mm (Nickel-Titanium Alloy)

This high-quality NiTi Shape Memory Spring is made from a nickel-titanium alloy renowned for its shape memory and superelastic properties. At room temperature, the spring is soft and easily extended with a small pulling force, reaching up to 50mm in length.

When heated to around 70 °C-either by passing an electric current through the coil or using hot water, a heat gun, or another heat source-the spring rapidly contracts back to its original length. During contraction, it provides a useful pulling force equivalent to lifting a 0.5 kg weight, making it ideal for demonstrations of material behaviour, energy transfer, and smart materials in action.

Compact and lightweight, this NiTi spring weighs just 1.1 g and measures 20 mm (closed length) with a 5.5 mm external diameter and 4 mm internal diameter.

Key Features

• Manufactured from nickel-titanium (NiTi) shape memory alloy
• Superelastic and heat-responsive behaviour
• Extends up to approximately 50mm at room temperature
• Contracts back to original shape when heated to 70 °C
• Produces a pulling force equivalent to lifting a 0.5 kg mass
• Lightweight design (1.1 g)
• Dimensions: 20mm closed length, 5.5mm external diameter, 4mm internal diameter
• Ideal for demonstrating smart materials and thermal activation concepts

Perfect for School Science Lessons & STEM Learning

This NiTi Shape Memory Spring is an excellent teaching tool for KS3, GCSE, and A-Level science and technology lessons. Its dramatic, heat-activated movement vividly demonstrates the behaviour of smart materials and the relationship between temperature, energy, and material structure.

• Exploring shape memory alloys in physics and D&T
• Demonstrating thermal activation and energy transfer
• Investigating superelasticity and material properties
• Supporting coursework and projects involving smart materials
• Providing hands-on, visually engaging STEM demonstrations

Reliable, compact, and engaging, this NiTi Shape Memory Spring brings material science concepts to life and enriches practical learning in the classroom.