NEN EN 13298 : 2003

Foreword
1 Scope
2 Normative references
3 Terms, symbols, units and their abbreviations
   3.1 Terms
   3.2 Symbols, units and their abbreviations
   3.3 Definition of the geometrical characteristics
4 Classification of the product
5 Requirements
   5.1 Service conditions
   5.2 Functional requirements
   5.3 Essential requirements
6 Product specification
   6.1 Technical specification
   6.2 Design characteristics
   6.3 Material
   6.4 Mechanical characteristics of the spring
   6.5 Surface protection
7 Test methods
   7.1 General
   7.2 Axial force-deflection testing
   7.3 Transverse stiffness test
   7.4 Test of free transverse deflection
   7.5 Test of geometrical characteristics
   7.6 Test of general and essential requirements
   7.7 Mechanical requirements
   7.8 Surface protection
8 Quality of the product
   8.1 General
   8.2 Product qualification procedures and samples
   8.3 Control and monitoring of production quality
   8.4 Final acceptance requirements
   8.5 Non conformity
9 Marking
10 Packaging
Annex A (normative) Helical cylindrical compression springs
        with constant inclination, formed from cylindrical steel bars
        and featuring formed and ground ends
        A.1 Object
        A.2 Inner and outer diameters
        A.3 Ends of the spring
        A.4 Contact line
        A.5 Geometrical tolerances
        A.6 Distance between the coils
Annex B (normative) Materials for hot formed and treated helical
        suspension springs
        B.1 General
        B.2 Material for helical suspension springs, steel
Annex C (normative) Repeatability of prestressing by means of
        shot peening
        C.1 Object
        C.2 Check of the intensity
        C.3 Check of the covering
Annex D (normative) Examination for inclusions
        D.1 Object
        D.2 Test methods
Annex E (normative) Magnetic detection of surface imperfections
        of helical springs formed from cylindrical steel bars
        E.1 Object
        E.2 Methods
        E.3 Special precautions
Bibliography