INDUSTRY COMPONENT

Hairspring

A hairspring is a fine spiral spring in mechanical watches and instruments that regulates oscillation frequency through elastic deformation.

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Component Specifications

Definition
The hairspring is a critical precision component in mechanical timekeeping devices, consisting of a thin, coiled spring typically made from specialized alloys. It works in conjunction with the balance wheel to create a harmonic oscillator that controls the rate of timekeeping through precise elastic deformation and recovery cycles. The hairspring's geometry, material properties, and thermal characteristics directly determine the accuracy and stability of the timing mechanism.
Working Principle
The hairspring operates on Hooke's law of elasticity, where the spring's restoring force is proportional to its displacement from equilibrium. When the balance wheel rotates, the hairspring coils and uncoils, creating a periodic oscillation with a specific frequency. This oscillation frequency serves as the timebase for the movement, with the hairspring's stiffness and moment of inertia determining the oscillation period through the formula T=2π√(I/k), where I is the moment of inertia and k is the spring constant.
Materials
Typically made from specialized alloys including: Nivarox (iron-nickel-chromium-titanium), Silicon (Si) for MEMS applications, Glucydur (beryllium-copper), or Elinvar (iron-nickel-chromium). Modern high-end applications may use silicon with DRIE (Deep Reactive Ion Etching) manufacturing.
Technical Parameters
  • Diameter 4-12 mm
  • Frequency 2.5-4 Hz (18,000-28,800 vph)
  • Thickness 0.02-0.05 mm
  • Active Length 200-400 mm
  • Number of Coils 10-14
  • Spring Constant 0.0001-0.001 N·m/rad
  • Temperature Coefficient <1 second/°C/day
Standards
ISO 3159, DIN 8308, NIHS 95-10

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Hairspring.

hairspring balance spring watch movement component precision spring oscillator spring timing regulator mechanical watch part Nivarox silicon hairspring Hairspring in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

Gauge Movement

The internal mechanism of a temperature gauge that converts thermal expansion into pointer movement.

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Engineering Analysis

Risks & Mitigation
  • Magnetic interference
  • Thermal expansion effects
  • Fatigue failure
  • Shock damage
  • Corrosion in humid environments
  • Hairspring sticking or tangling
FMEA Triads
Trigger: Magnetic field exposure
Failure: Altered spring constant leading to timing errors
Mitigation: Use anti-magnetic alloys (Nivarox, silicon) or magnetic shielding
Trigger: Mechanical shock
Failure: Deformation or breakage of delicate spring
Mitigation: Implement shock protection systems (Incabloc, Kif) and proper handling procedures
Trigger: Temperature variations
Failure: Thermal expansion altering spring properties
Mitigation: Use temperature-compensating alloys (Elinvar) with low thermal coefficients

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.005 mm diameter, ±0.001 mm thickness, ±1° coil spacing
Test Method
ISO 3159 chronometer testing, frequency measurement with timing machines, thermal compensation testing, magnetic resistance testing per NIHS 90-10

Buyer Feedback

★★★★☆ 4.7 / 5.0 (29 reviews)

"The technical documentation for this Hairspring is very thorough, especially regarding technical reliability."

"Reliable performance in harsh Computer, Electronic and Optical Product Manufacturing environments. No issues with the Hairspring so far."

"Testing the Hairspring now; the technical reliability results are within 1% of the laboratory datasheet."

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Frequently Asked Questions

What is the purpose of a hairspring in a mechanical movement?

The hairspring regulates the oscillation frequency of the balance wheel, serving as the timekeeping element that controls the accuracy of the mechanical movement through precise elastic deformation cycles.

Why are hairsprings made from special alloys?

Special alloys like Nivarox and Elinvar provide minimal thermal expansion, excellent elasticity, and resistance to magnetic fields and corrosion, ensuring stable timekeeping across varying environmental conditions.

How does hairspring geometry affect timekeeping accuracy?

The coil spacing, thickness, and overall geometry determine the spring constant and moment of inertia, directly influencing the oscillation frequency and isochronism (consistent period regardless of amplitude).

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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