Closing Spring: Wire Diameter 2-10 mm, Free Length 50-200 mm

Component Specifications

Definition

A closing spring is a type of compression or torsion spring specifically designed for operating mechanisms, providing the necessary force to ensure reliable closure or return motion in mechanical systems. It functions as an energy storage device that accumulates potential energy when compressed or twisted and releases it to actuate the closing action.

Working Principle

The closing spring operates on Hooke's Law (F = kx), where force is proportional to displacement. When the operating mechanism is opened or activated, the spring is compressed or twisted, storing elastic potential energy. Upon release, this energy is converted back to kinetic energy, generating force to return the mechanism to its closed position.

Materials

Typically made from high-carbon steel (ASTM A228/A229), stainless steel (AISI 302/316), or alloy steel (ASTM A401). May include coatings like zinc plating, powder coating, or passivation for corrosion resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Free Length	50-200 mm
Spring Rate	10-50 N/mm
Maximum Load	100-500 N
Wire Diameter	2-10 mm
Operating Temperature	-40°C to 120°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 10243, DIN 2095

Parent Products

This component is used in the following industrial products

Operating Mechanism

The mechanical assembly responsible for opening and closing the contacts of a main circuit breaker.

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Engineering Analysis

Risks & Mitigation

Fatigue failure due to cyclic loading
Corrosion in harsh environments
Over-compression leading to permanent set
Incorrect installation causing misalignment

FMEA Triads

Trigger: Material fatigue from repeated compression cycles
Failure: Spring fracture or loss of elasticity
Mitigation: Use high-cycle-life materials, apply shot peening, and design within safe stress limits.

Trigger: Exposure to corrosive chemicals or moisture
Failure: Corrosion-induced weakening or breakage
Mitigation: Select corrosion-resistant materials (e.g., stainless steel) and apply protective coatings.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±10% on spring rate, ±2% on free length per ISO 10243

Test Method

Compression testing to verify load-deflection characteristics, fatigue testing per ASTM E606

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Closing Spring

Manufacturer profiles associated with Closing Spring.

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Frequently Asked Questions

What is the main function of a closing spring?

The main function is to provide consistent return force to close or reset a mechanical mechanism after it has been opened or activated.

How do I select the right closing spring for my application?

Consider factors like required force (spring rate), space constraints (free length and compressed length), environmental conditions (material and coating), and cycle life. Refer to standards like ISO 10243 for guidance.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Closing Spring