KRL micro springs are the smallest nitinol springs–and the lightest actuators available anywhere!  So, if you’re looking to build something small, KRL is the place to go!

Spring mandrel size (spring inner diameter) equal and smaller than 3.2mm is defined as Microspring.  

The listing price is for per 5mm. If multiple units are ordered, a continuous length will be sent out unless said otherwise in the comments box during check out.

For bigger Springs, please check “Helical 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

Nitinol Micro-Springs

Select Pitch and Transition Temperature below to add to cart.

NameWire Size(mm)Mandrel Sizeprice(5mm)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
5-NiTi-0.15-0.5$8.00
0-150-5mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
5-NiTi-0.15-0.9$8.00
0-150-9mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
5-NiTi-0.15-1.15$8.00
0-151-15mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
5-NiTi-0.15-1.6$8.00
0-151-6mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
5-NiTi-0.15-2.4$8.00
0-152-4mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
5-NiTi-0.15-3.2$8.00
0-153-2mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
5-NiTi-0.25-0.5$2.99
0-250-5mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
5-NiTi-0.25-0.9$2.99
0-250-9mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
5-NiTi-0.25-1.15$2.99
0-251-15mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
5-NiTi-0.25-1.6$2.99
0-251-6mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
5-NiTi-0.25-2.4$2.99
0-252-4mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
5-NiTi-0.25-3.2$2.99
0-253-2mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
5-NiTi-0.4-0.5$2.99
0-40-5mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
5-NiTi-0.4-0.9$2.99
0-40-9mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
5-NiTi-0.4-1.15$2.99
0-41-15mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
5-NiTi-0.4-1.6$2.99
0-41-6mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
5-NiTi-0.4-2.4$2.99
0-42-4mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
5-NiTi-0.4-3.2$2.99
0-43-2mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
5-NiTi-0.5-0.5$2.99
0-50-5mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
5-NiTi-0.5-0.9$2.99
0-50-9mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
5-NiTi-0.5-1.15$2.46
0-51-15mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
5-NiTi-0.5-1.6$2.46
0-51-6mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
5-NiTi-0.5-2.4$2.21
0-52-4mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
5-NiTi-0.5-3.2$2.21
0-53-2mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
5-NiTi-0.75-0.5$2.99
0-750-5mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
5-NiTi-0.75-0.9$2.71
0-750-9mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
5-NiTi-0.75-1.15$2.46
0-751-15mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
5-NiTi-0.75-1.6$2.46
0-751-6mmtight wire-size-x-2 wire-size-x3 wire-size-x415c 20c 35c 45c 80c
5-NiTi-0.75-2.4$2.21