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Nitinol Shape Memory Spring Manufacturer and Supplier in India

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Nitinol Shape Memory Springs are precision coiled spring elements produced from nickel titanium (NiTi) alloy wire which are capable of producing mechanical motion by utilizing temperature variation. The Nitinol Shape Memory Springs are produced from ASTM F2063 wrought Nitinol and can be designed with one-way or two-way actuator function with specific transformation temperatures and stroke forces. These springs can be produced in customized wire diameter, coiling size, stroke length, and heat set for thermal valve actuators, actuators, aerospace mechanisms, medical instruments, and release mechanisms. Sachin Steel Centre offers custom Nitinol Shape Memory Springs based on customer drawings with chemistry and transformation temperature certification per lot.

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Table Of Content

Technical Data

Specifications of Nitinol Shape Memory Spring

Parameter

Specification

Wire Standard

ASTM F2063 / ASME SF2063 (wrought binary NiTi material)

Wire Diameter Range

0.1 mm to 5.0 mm (0.0039 in to 0.1969 in)

Spring Outer Diameter (OD)

[0.5 mm to 50 mm / As specified per drawing]

Spring Type

Extension and compression; torsion available on request

Behaviour

Thermal shape memory (one-way thermal activation; two-way shape memory available after specialized thermo-mechanical training)

Af Range (Austenite Finish)

+35°C to +95°C (above room temperature; tailored by composition and heat treatment)

Condition

Shape-set (heat-set) to drawing geometry

Applications

Thermal actuators, thermal valves, quick-release mechanisms, fire safety dampers, deployment locks

Industries Served

Aerospace, automotive, medical devices, robotics, consumer appliances, industrial automation

Key Advantages

Generates large axial stroke and high force from a compact, silent component without motors, gears, or solenoids

Testing

Af transformation temperature verified by Bend & Free Recovery (ASTM F2082) or Differential Scanning Calorimetry (ASTM F2004)

Certification

Material Test Report (MTR) confirming chemical composition and mechanical parameters per lot

Chemical Composition of Nitinol Shape Memory Spring

Element

Specification Limit (wt %)

Typical Lot Certificate Example

Nickel (Ni)

54.5 to 57.0

55.76%

Titanium (Ti)

Balance

Balance

Carbon (C)

0.050 max

0.044%

Oxygen + Nitrogen (O + N)

0.050 max

0.028% (O: 0.026%, N: 0.002%)

Iron (Fe)

0.050 max

0.008%

Cobalt (Co)

0.050 max

—

Niobium (Nb)

0.025 max

—

Copper (Cu)

0.010 max

—

Chromium (Cr)

0.010 max

—

Hydrogen (H)

0.005 max

0.001%

Mechanical Properties of Nitinol Shape Memory Spring

Mechanical Property

Austenite Phase (above Af)

Martensite Phase (below Mf)

Young’s Modulus

~83 GPa

~26 to 48 GPa

Yield Strength

195 to 690 MPa

70 to 140 MPa

Ultimate Tensile Strength

~895 MPa (annealed) up to ~1900 MPa (cold worked)

~895 MPa (annealed) up to ~1900 MPa (cold worked)

Max Recoverable Strain (One-Time)

Up to ~8%

Up to ~8%

Working Strain (Repeated Actuation)

Well below 8% (typically 2%–4%)

Well below 8% (typically 2%–4%)

Poisson’s Ratio

~0.33

~0.33

Nitinol Shape Memory Spring Equivalent Grades

Standard / UNS / ASTM

Material / Subject

UNS N01555

Binary NiTi Alloy (~55 wt% Ni, Ti balance)

ASTM F2063 / ASME SF2063

Wrought Nickel-Titanium Shape Memory Material

ASTM F2004

Phase Transformation (Af) by DSC

ASTM F2082

Transformation Temp (Af) by Bend & Free Recovery

ASTM F2516

Tension & Tensile Testing

ASTM F2005

Terminology & Standard Definitions

Size and Dimensions Chart of Nitinol Shape Memory Spring

Wire Diameter (mm)

Wire Diameter (in)

Area (mm²)

Weight (g/m)

Weight (lbs/1000 ft)

Length per kg (m)

0.1 mm

0.0039 in

0.0079

0.0507 g

0.034 lbs

19,740 m

0.15 mm

0.0059 in

0.0177

0.1140 g

0.077 lbs

8,773 m

0.2 mm

0.0079 in

0.0314

0.2026 g

0.136 lbs

4,935 m

0.25 mm

0.0098 in

0.0491

0.3166 g

0.213 lbs

3,158 m

0.3 mm

0.0118 in

0.0707

0.4559 g

0.306 lbs

2,193 m

0.4 mm

0.0157 in

0.1257

0.8105 g

0.54 lbs

1,234 m

0.5 mm

0.0197 in

0.1963

1.266 g

0.85 lbs

789.6 m

0.6 mm

0.0236 in

0.2827

1.824 g

1.23 lbs

548.3 m

0.8 mm

0.0315 in

0.5027

3.242 g

2.18 lbs

308.4 m

1.0 mm

0.0394 in

0.7854

5.066 g

3.40 lbs

197.4 m

1.2 mm

0.0472 in

1.1310

7.295 g

4.90 lbs

137.1 m

1.5 mm

0.0591 in

1.7671

11.398 g

7.66 lbs

87.7 m

2.0 mm

0.0787 in

3.1416

20.263 g

13.62 lbs

49.4 m

2.5 mm

0.0984 in

4.9087

31.661 g

21.28 lbs

31.6 m

3.0 mm

0.1181 in

7.0686

45.592 g

30.64 lbs

21.9 m

4.0 mm

0.1575 in

12.5664

81.053 g

54.47 lbs

12.3 m

5.0 mm

0.1969 in

19.6350

126.645 g

85.10 lbs

7.9 m

Applications and Industrial Uses of Nitinol Shape Memory Spring

  • Thermal Actuators
  • Temperature-Controlled Valves
  • Medical Devices and Instruments
  • Aerospace Actuation Systems
  • Automotive Thermal Systems
  • Robotic and Automation Systems
  • Safety and Release Mechanisms
  • Consumer Electronics and Compact Actuators
Application Industries

Frequently Asked Questions

A Nitinol Shape Memory Spring is a coil spring made from nickel-titanium alloy that changes shape and produces mechanical movement when heated or cooled.

It works through the shape memory effect of Nitinol. When heated above its transformation temperature, the spring returns to its preset shape and generates force.

A one-way Nitinol spring returns to its preset shape when heated, while a two-way spring is trained to change between two shapes on heating and cooling. Two-way movement is smaller and less repeatable than one-way movement, and a one-way spring needs a bias force to reset.

Yes, Nitinol Shape Memory Springs can be customized by wire diameter, coil diameter, spring length, number of coils, force, and transformation temperature.

Life depends on strain, stress, temperature, and the number of cycles. A lower working strain generally gives a longer life. Send us your duty and we will advise.

Yes, Nitinol springs can be electrically actuated by passing current through the conductive wire to generate resistive heating and trigger shape recovery.

Pick an Af above the highest temperature at which the spring must stay soft and below the temperature your heater reaches, with a margin on each side.

Use k = G × d⁴ / (8 × D³ × Na), with G about 31.2 GPa for austenite. See the spring dimensions table above.

A shape memory spring moves when heated. A superelastic spring recovers when the load is removed, with no heat. See our Nitinol Super Elastic Spring page.

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