Nitinol shape memory alloy springs that expand or contract when heated to approximately 50C. Heating to a higher temperature speeds up the reaction.

Master selector for our nitinol springs that are in-stock ready for immediate shipment.

Select between 1-way or 2-way function.

1-Way 'Contract when hot' springs must be pulled open when cold manually.

2-Way 'Contact when hot' springs expand when cooled by themselves without any pullback mechanism.

1-Way and 2-Way springs exhibit different pulling forces and other characteristics; we advise trying both to see which suit your needs best for your specific application.

Custom orders: minimum order 20 units. Contact us with the spring spec and it will be ready in 3 weeks. We recommend starting with a spring that is in inventory, studying is performance, and extrapolating the results to your application prior to committing to a custom spring order.