Nitinol Helical Springs can be used as actuators to realize longer travel distance and more controllable force than Nitinol wires.

Spring mandrel size (spring inner diameter) equal and bigger than 4.75mm is defined as Helical Springs.

The listing price is for per inch.  If multiple units are ordered, a continuous length will be sent out unless said otherwise in the comments box during check out.

For smaller Springs, please check “Micro-Springs” listings.

Mandrel Size

We use Mandrels to wrap springs, so mandrel size is the inner diameter of the springs.  Other than what shown on the table below, other mandrel size can be made, contact us for customization.

Pitch

Pitch is the distance between the center of adjacent wraps.  We have 4 pitch sizes order-able online, but any pitch size can be made, contact us for customization.

Transition Temperature
NameAustenite Finish

Transition Temperature(°C)

Effect
SuperElastic-15Springy in room temperature
Air Temp20Soft in cool environment(freezer, ice water…) and change to set shape when brought to room temp.
Body Temp35Soft in cool environment(freezer, ice water…) and change to set shape when held in hands.
Standard Temp45Soft in room temperature and change to set shape when heat to 45°C and above.
High Temp80Soft in room temperature and change to set shape when heat to 80°C and above
Alloy Composition

The micro-springs listed in the catalog below are all NiTi.  But other alloy types are also available. Contact us for customization.

AlloyEffect
NiTiRegular
NiTiCuLow Hysteresis
NiTiFeHigh Strength
Force/Travel/Reaction Time

Rule of the thumb, force is bigger with the bigger wire size and smaller mandrel size.

Springs listed here are one-way compression springs, meaning springs can be stretched at low temperature, and snap back to its original shape when heat up above transition temperature. For extension springs and 2-way shape memory springs, where travel needs to be defined, please contact us to Request A Quote.

Reaction time depends on the environmental temperature differences.

For more info, please refer to our Knowledge Base.

Nitinol Helical Springs

Select Pitch and Transition Temperature below to add to cart.

NameWire Size(mm)Mandrel Sizeprice(inch)Buyhf:att:pa_wire-sizemmhf:att:pa_mandrel-sizehf:att:pa_alloyhf:att:pa_colorhf:att:pa_dimensionhf:att:pa_furnace-sizehf:att:pa_pitchhf:att:pa_rod-diameterhf:att:pa_rod-diameter-rangehf:att:pa_thicknesshf:att:pa_transitiontemphf:att:pa_widthhf:att:pa_wire-lengthinch
H-NiTi-0.5-4.75$7.08
0-54-75mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
H-NiTi-0.5-6$8.05
0-56tight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
H-NiTi-0.75-4.75$8.05
0-754-75mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
H-NiTi-0.5-8$8.89
0-58tight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
H-NiTi-1-4.75$8.89
14-75mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
H-NiTi-0.5-9.5$9.45
0-59-5mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
H-NiTi-1-6$9.91
16tight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
H-NiTi-0.4-4.75$10.01
0-44-75mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
H-NiTi-0.75-6$10.08
0-756tight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
H-NiTi-0.25-4.75$10.10
0-254-75mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
H-NiTi-0.5-12.7$10.33
0-512-7mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
H-NiTi-1-8$10.51
18tight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
H-NiTi-1-9.5$11.44
19-5mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
H-NiTi-1.25-4.75$12.33
1-254-75mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
H-NiTi-0.75-8$12.34
0-758tight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
H-NiTi-1-12.7$12.49
19-5mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
H-NiTi-0.25-6$12.62
0-256tight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
H-NiTi-0.4-6$12.62
0-46tight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
H-NiTi-0.5-14.2$12.78
0-514-2mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
H-NiTi-1.25-6$13.00
1-256tight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
H-NiTi-1-14.2$13.64
114-2mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
H-NiTi-1.25-8$13.84
1-258tight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
H-NiTi-1.5-6$13.85
1-56tight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
H-NiTi-0.75-9.5$14.18
0-759-5mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
H-NiTi-0.5-16$14.34
0-516mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
H-NiTi-0.75-12.7$15.50
0-7512-7mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
H-NiTi-1-16$15.50
116mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
H-NiTi-1.5-4.75$16.33
1-54-75mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
H-NiTi-0.25-8$16.66
0-258tight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
H-NiTi-0.4-8$16.66