ISO 11891:2012

Hot formed helical compression springs — Technical specifications

This International Standard specifies the materials, shapes, spring characteristics, tolerances, manufacturing requirements and test methods for common helical compression springs, which are made from hot coiled round section steel bar, and then quenched and tempered (hereinafter simply "springs"). The following limit values apply to springs conforming to this International Standard: — free length: ≤ 900 mm; — spring index: 3 to 12; — slenderness ratio: 0,8 to 4; — active coils: ≥ 3; — spring pitch: D; — wire diameter: 8 mm to 60 mm; — mean diameter of coil: ≤ 460 mm. This International Standard is not applicable to coil springs with special performance requirements, such as railway and automotive suspensions.

Ressorts de compression hélicoïdaux formés à chaud — Spécifications techniques

General Information

• Status: Published
• Publication Date: 10-Apr-2012
• ICS: 21.160 - Springs
• Technical Committee: ISO/TC 227 - Springs
• Drafting Committee: ISO/TC 227 - Springs
• Current Stage: 9093 - International Standard confirmed
• Completion Date: 23-Nov-2023

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 11891
First edition
2012-04-15
Hot formed helical compression
springs — Technical specifications
Ressorts de compression hélicoïdaux formés à chaud —
Spécifications techniques
Reference number
ISO 11891:2012(E)
©
ISO 2012

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ISO 11891:2012(E)
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ii © ISO 2012 – All rights reserved

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ISO 11891:2012(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3  Terms, definitions and symbols . 1
3.1  Terms and definitions . 1
3.2  Symbols and units . 1
4 Material . 2
4.1 Adoption of material . 2
4.2  Diameter and tolerance of bars . 2
5  Spring construction . 2
5.1 Direction of helix . 2
5.2  Types of coil end . 3
6 Spring characteristics . 3
6.1 General . 3
6.2  Length at a specified load . 3
6.3  Load at a specified length . 3
6.4 Spring rate . 3
7 Tolerances of spring dimensions and characteristics . 3
7.1 General . 3
7.2 Free length . 4
7.3 Diameter of coils . 4
7.4 Total coils . 4
7.5  Perpendicularity . 4
7.6 Parallelism .
...