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Nitinol Super Elastic Spring Manufacturer and Supplier in India

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Nitinol Super Elastic Springs are nickel-titanium (NiTi) alloy springs which return to their original shape when a load is removed – they can be used for large deformation without requiring heat activation. There is a reversible phase transformation from austenite to martensite and vice versa during loading and unloading, respectively, which is the cause of this superelastic behavior. These springs are made from ASTM F2063 NiTi wire, and can be fabricated into compression, extension and torsion springs with specified dimensions, forces and transformation temperatures. Medical device mechanisms, precision actuators, vibration control, robots, aerospace components and industrial force management systems are some of the applications for which these systems are used. Sachin Steel Centre produces Nitinol Super Elastic Springs to your drawing, with an EN 10204 3.1 material test certificate to use for engineering, medical device, research and industry applications. 

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Table Of Content

Technical Data

Specifications of Nitinol Super Elastic Spring

Parameter

Specification & Standard Range

Material Standard

ASTM F2063 / ASME SF2063 (Wrought Nickel-Titanium Shape Memory Alloys)

Spring Types

Compression (open pitch), extension (close wound with hooks or loops), torsion and micro coils. For flat springs, see Nitinol Super Elastic Sheet.

Wire Diameter Range

0.10 to 5.00 mm standard (0.05 to 6.00 mm custom)

Spring Outer Diameter (OD)

[0.50 to 50.0 mm / Custom to drawing]

Free Length

Custom, to your drawing

Active Af Range

Set below the working temperature (typically −15 to +20 °C for room temperature use)

Delivery Condition

Superelastic condition (shape set / heat set to final geometry)

Density

6.45 g/cm³ (0.233 lb/in³)

Testing Standards

Af verified by DSC (ASTM F2004) or Bend & Free Recovery (ASTM F2082). Tensile plateaus and permanent set verified per ASTM F2516.

Quality Certification

EN 10204 3.1 material test certificate with heat chemistry, tensile results, and Af result per lot

Chemical Composition of Nitinol Super Elastic Spring

Element

Minimum (Weight %)

Maximum (Weight %)

Nickel (Ni)

54.5

57.0

Titanium (Ti)

Balance

Balance

Carbon (C)

—

0.050

Oxygen + Nitrogen (O + N)

—

0.050

Cobalt (Co)

—

0.050

Iron (Fe)

—

0.050

Niobium (Nb)

—

0.025

Copper (Cu)

—

0.010

Chromium (Cr)

—

0.010

Hydrogen (H)

—

0.005

Mechanical Properties of Nitinol Super Elastic Spring

Property

Typical Value (Austenitic State)

Test Method & Design Context

Young’s Modulus (E)

41 to 83 GPa

Temperature dependent; evaluated prior to stress-induced phase transition.

Shear Modulus (G)

31.2 GPa

Calculated via G = E / (2(1 + ν)), with ν = 0.33. Used for the initial spring rate.

Upper Plateau Stress (UPS)

380 MPa (at 3% strain)

Tested per ASTM F2516 at +22 °C. Marks the onset of stress-induced martensite.

Lower Plateau Stress (LPS)

150 MPa (at 2.5% unload)

Minimum unloading stress plateau during strain release per ASTM F2516.

Permanent Set / Residual Elongation

0.3% maximum

Measured per ASTM F2516 after unloading from 6% tensile strain.

Ultimate Tensile Strength (UTS)

1070 MPa

Cold-worked/aged condition dependent; ensures high structural integrity.

Max Recoverable Strain

Up to 8.0%

Design spring shear strain for 4% or less for multi-thousand cycle endurance.

Poisson’s Ratio (ν)

0.33

Elastic lateral contraction factor in austenitic phase.

Physical Properties of Nitinol Super Elastic Spring

Property

Metric Value

Imperial Value

Density

6.45 g/cm³

0.233 lb/in³

Melting Point

~1300 to 1310 °C

~2370 to 2390 °F

Electrical Resistivity (austenite)

~80 to 100 µΩ·cm

~31 to 39 µΩ·in

Thermal Conductivity (austenite)

~18 W/m·K

~10.4 BTU/ft·h·°F

Coefficient of Thermal Expansion (austenite)

~11 × 10−6 /°C

~6.1 × 10−6 /°F

Specific Heat

~837 J/kg·K

~0.20 BTU/lb·°F

Latent Heat of Transformation

~24.2 J/g

~10.4 BTU/lb

Weight Chart of Nitinol Super Elastic Spring Wire

Wire Diameter (d)

Diameter (in)

Cross-Sectional Area (mm²)

Linear Mass (g/m)

Linear Mass (g/ft)

Total Yield Length per kg (m/kg)

0.10 mm

0.0039 in

0.0079

0.051

0.015

19,740

0.20 mm

0.0079 in

0.0314

0.203

0.062

4,935

0.30 mm

0.0118 in

0.0707

0.456

0.139

2,193

0.40 mm

0.0157 in

0.1257

0.811

0.247

1,234

0.50 mm

0.0197 in

0.1963

1.266

0.386

790

0.80 mm

0.0315 in

0.5027

3.242

0.988

308

1.00 mm

0.0394 in

0.7854

5.066

1.544

197

1.20 mm

0.0472 in

1.1310

7.295

2.224

137

1.50 mm

0.0591 in

1.7671

11.398

3.474

87.7

2.00 mm

0.0787 in

3.1416

20.263

6.176

49.4

2.50 mm

0.0984 in

4.9087

31.661

9.650

31.6

3.00 mm

0.1181 in

7.0686

45.592

13.896

21.9

4.00 mm

0.1575 in

12.5664

81.053

24.705

12.3

5.00 mm

0.1969 in

19.6350

126.646

38.602

7.9

Compression Spring Dimensions of Nitinol Super Elastic Spring

Wire d

Mean Coil D

Index C

Active Coils Na

Initial Rate k (N/mm)

Estimated Onset Force (N)

Developed Wire Length

Approx. Spring Mass

0.30 mm

2.40 mm

8.0

8.0

0.286

0.82

0.075 m

0.034 g

0.50 mm

4.00 mm

8.0

8.0

0.477

2.28

0.126 m

0.159 g

1.00 mm

8.00 mm

8.0

10.0

0.762

9.11

0.302 m

1.528 g

1.50 mm

12.00 mm

8.0

10.0

1.143

20.50

0.452 m

5.156 g

2.00 mm

16.00 mm

8.0

12.0

1.270

36.45

0.704 m

14.260 g

3.00 mm

24.00 mm

8.0

10.0

2.285

82.01

0.905 m

41.250 g

Applications and Industrial Uses of Nitinol Super Elastic Spring

  • Medical Device Mechanisms
  • Vibration Isolation Systems
  • Robotic Actuators
  • Aerospace Actuation Systems
  • Eyeglass hinges and orthodontic coils
  • Force-Control Mechanisms
  • Precision Motion Systems
  • Shock and Impact Absorption Systems
Application Industries

Frequently Asked Questions

A Nitinol Super Elastic Spring is a nickel-titanium spring that can undergo large deformation and return to its original shape after the load is removed.

 

It works through stress-induced transformation from austenite to martensite during loading, followed by recovery to austenite when the load is released.

It can typically recover up to about 8% strain, depending on the material condition, spring design, and operating conditions.

Life depends on strain, so a lower working strain generally gives a longer life. Send us your duty and we will advise.

Yes, they are used in medical devices and mechanisms where compact size, flexibility, fatigue resistance, and recoverable deformation are required.

Not exactly. Along the stress plateau, the force stays nearly flat over a long deflection, but loading force is higher than unloading force.

A super elastic spring recovers when the load is removed, with no heat. A shape memory spring moves when heated. See our Nitinol Shape Memory Spring page.

Pick an Af below the lowest working temperature, and confirm Af on the finished spring because shape setting changes it.

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