Editorial Technical Reference

Constant Force Spring

This page explains how Constant Force Spring is classified within Fabricated Metal Product Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A constant force spring is a spiral spring that provides a nearly constant force over its deflection range, used in counterbalancing and retraction applications.

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Product Specifications

Technical details and manufacturing context for Constant Force Spring

Definition

Constant force springs are used in applications requiring a steady force over a long travel, such as counterbalancing heavy equipment, retracting cables, and in automotive seat belts. They are specified by force, travel, and dimensions. Grades differ by material (e.g., high-carbon steel vs. stainless), thickness, and manufacturing precision, affecting fatigue life and force consistency.

Working Principle

The spring is wound into a tight spiral and when extended, it uncoils, with the force generated by the elastic deformation of the strip material. The force remains nearly constant because the radius of curvature changes minimally over the working deflection, maintaining a consistent torque.

Common Materials

AISI 1095 high-carbon steel, AISI 301 stainless steel, 17-7 PH stainless steel, Inconel X-750

Technical Parameters

Parameter	Typical range	Notes & selection driver
Force	0.5–500 N	Force range available; specified at a given deflection.
Travel	10–2000 mm	Maximum deflection range.
Strip Thickness	0.05–1.5 mm	Thickness of the spring strip material.
Strip Width	1–100 mm	Width of the spring strip.
Drum Diameter	10–200 mm	Diameter of the drum on which the spring is wound.
Force Tolerance	±5 %	Typical tolerance on force.
Fatigue Life	10000–100000 cycles	Expected cycles before failure, depending on material and stress.
Operating Temperature	-40 to 250 °C	Range for standard materials; higher for Inconel.
Surface Finish	Bright or black oxide	Typical finishes for corrosion resistance.
End Configuration	Hooked, looped, or plain	Ends can be customized for attachment.
Material Grade	AISI 1095, 301 SS, 17-7 PH	Selection based on environment and fatigue requirements.
Strip Thickness Tolerance	±0.01 mm	Precision tolerance on thickness.

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

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Constant Force Spring.

Published Manufacturer Relationships

Source-reviewed profile relationships currently associated with Constant Force Spring

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Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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