Editorial Technical Reference

Torsion Spring

This page explains how Torsion 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 torsion spring is a helical spring that exerts torque or rotary force when twisted, used to store and release angular energy.

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Product Specifications

Technical details and manufacturing context for Torsion Spring

Definition

Torsion springs are used in applications requiring rotational force, such as hinges, door mechanisms, and automotive components. They are specified by wire diameter, coil diameter, number of coils, free angle, and spring rate. Grades are distinguished by material quality, surface finish, and precision of dimensions, with higher grades offering tighter tolerances and better fatigue life.

Working Principle

Torsion springs work by resisting angular deflection. When a torque is applied to the ends, the spring twists, storing potential energy. The spring rate (torque per degree) is determined by material properties, wire diameter, coil diameter, and number of active coils.

Common Materials

Spring steel (EN 10270-1: DH, SH), Stainless steel (AISI 302, 316, 17-7 PH), Music wire (ASTM A228), Oil-tempered wire (ASTM A229), Chrome-vanadium steel (ASTM A231), Chrome-silicon steel (ASTM A401)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Wire Diameter	0.1–12 mm	Range of wire diameters availableISO 10243
Coil Diameter (Outer)	1–80 mm	Outer diameter range
Free Length	2–200 mm	Length of spring in unloaded state
Total Coils	3–20 coils	Number of coils including ends
Spring Rate	0.01–50 N·mm/deg	Torque per degree of deflection
Maximum Deflection	≤360 deg	Maximum angular deflection without permanent set
Tolerance on Wire Diameter	±0.01–±0.05 mm	Precision class dependentISO 10243
Tolerance on Free Angle	±2–±5 deg	Angular tolerance between legs
Surface Finish	Shot peened, oiled, or coated	Typical finishes for corrosion resistance and fatigue
Operating Temperature Range	-40 to 150 °C	Depends on material; stainless up to 250°C
Fatigue Life	10,000–1,000,000 cycles	Expected cycles for specified load
End Configuration	Straight, offset, or special	Legs can be straight or bent to fit application
Test Method	Torque test at specified angle	Verification of spring rate and torqueISO 26909

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Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Torsion Spring.

Published Manufacturer Relationships

Source-reviewed profile relationships currently associated with Torsion 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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