Micro Spring (per 5mm) 0.5mm wire

Micro Spring (per 5mm) 0.5mm wire

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.  Available mandrel sizes are 0.5mm, 0.9mm, 1.15mm, 1.6mm, 2.4mm, 3.2mm.

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. 


For bigger Springs, please check "Helical Springs" listings.

For special designs or sizes, please feel free to contact us: info@kelloggsresearchlabs.com.

Transition Temperature

TagTransition Temperature(°C/°F)
SuperElastic-15/5Austenitic at room temperature
Air Temp20/70Martensitic in a cool environment(freezer, ice water…) and changes to set shape when brought to room temp.
Body Temp35/95Martensitic in a cool environment(freezer, ice water…) and changes to set shape when held in hands.
Standard Temp45/115Martensitic at room temperature and change to set shape when heated to 45°C and above.
High Temp80/180Martensitic at elevated temperatures and changes to set shape when heat to 80°C and above.
Note: Heat can be generated electrically. 



Pitch is the distance between the center of two consecutive wraps of wire

Mandrel size

Determines the inside diameter of the spring.

Free Shipping

This product qualifies for free air shipping within the US and $1 internationally..

  • Product Code: Micro-Spr-050
  • Availability: In Stock
  • $2.49

Available Options

Tags: Nitinol Micro Spring