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: < 0,5D;
— 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.
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CVP_Secretariat_Loca
Foreword
1 Scope
2 Normative references
3 Terms, definitions and symbols
3.1 Terms and definitions
3.2 Symbols and units
4 Material
4.1 Adoption of material
4.2 Diameter and tolerance of bars
5 Spring construction
5.1 Direction of helix
5.2 Types of coil end
6 Spring characteristics
6.1 General
6.2 Length at a specified load
6.3 Load at a specified length
6.4 Spring rate
7 Tolerances of spring dimensions and characteristics
7.1 General
7.2 Free length
7.3 Diameter of coils
7.4 Total coils
7.5 Perpendicularity
7.6 Parallelism
7.7 Irregularity of pitch
7.8 Solid length
7.9 Tolerances on spring characteristics
8 Requirements for manufacturing
8.1 Heat treatment
8.2 Hardness
8.3 Decarburization
8.4 Grain size
8.5 Surface conditions
8.6 End surface machining
8.7 Shot peening
8.8 Setting (presetting)
8.9 Surface protection
9 Test methods
9.1 General
9.2 Spring characteristics
9.3 Dimensions and shapes
9.4 Surface conditions
9.5 Hardness
9.6 Decarburization
9.7 Grain size
9.8 Shot peening
9.9 Surface protection
Bibliography
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CVP_Secretariat_Loca
Foreword
1 Scope
2 Normative references
3 Terms, definitions and symbols
3.1 Terms and definitions
3.2 Symbols and units
4 Material
4.1 Adoption of material
4.2 Diameter and tolerance of bars
5 Spring construction
5.1 Direction of helix
5.2 Types of coil end
6 Spring characteristics
6.1 General
6.2 Length at a specified load
6.3 Load at a specified length
6.4 Spring rate
7 Tolerances of spring dimensions and characteristics
7.1 General
7.2 Free length
7.3 Diameter of coils
7.4 Total coils
7.5 Perpendicularity
7.6 Parallelism
7.7 Irregularity of pitch
7.8 Solid length
7.9 Tolerances on spring characteristics
8 Requirements for manufacturing
8.1 Heat treatment
8.2 Hardness
8.3 Decarburization
8.4 Grain size
8.5 Surface conditions
8.6 End surface machining
8.7 Shot peening
8.8 Setting (presetting)
8.9 Surface protection
9 Test methods
9.1 General
9.2 Spring characteristics
9.3 Dimensions and shapes
9.4 Surface conditions
9.5 Hardness
9.6 Decarburization
9.7 Grain size
9.8 Shot peening
9.9 Surface protection
Bibliography