Spring Design, Engineering, Formulas
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The following are to links of spring engineering resources, tools, articles and other useful data.

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Spring Design and Engineering Formulas and Knowledge Menu
 Axial Tension or Compression Springs Stiffness Constant Equations and Calculator
 Bending Applied Spring Stiffness Constant Equations and Calculator
 Preferred Sizes for Spring Materials, Wire, Strip, and Bars.
 Morrison's Spring Tables Design Reference Premium Membership Required to view Document/Book
 Typical Modulus of Elasticity of Spring Materials used in Torsion and Tension
 Belleville Spring Washer
 Design Equations of Belleville Washer Springs Premium Membership required
 Coil Spring
 Compression Spring Calculator
 Compression Spring "k" Constant Calculator
 Compression Spring Assembly Operating Life and Reliability Equations and Calculator
 Conical Helical Compression Spring Design Equations and Calculator
 Constant Force Spring Design & Equations
 Helical Compression Springs Engineering and Design
 Extension Spring "k" Constant Calculator
 Extension Spring Calculator
 Extension Spring Normal Load Tolerances load / force Specifications
 Springs Made from Flat Rectangular Cold Rolled Strip Stock Design and Equations Premium Memebrship Required Document
 Flat spring supported on both ends design equations and calculator
 Flat spring cantilevered design equations and calculator
 Flat spring cantilevered design triangular geometry equations and calculator

Helical Extension Springs Engineering and Design
Design and Calculation for Springs Made From Circular Section Wire and Bar Premium Membership Required to view Document/Book  Helical Compression Spring Critical Frequency Formula and Calculator Helical springs, such as those used in the valve trains of internal combustion engines, can fail if the frequency of loading coincides with the natural, or critical, frequency of the spring, called resonance.
 Helical Spring Fatigue Loading and Factor of Safety Formula and Calculator Rarely are helical springs not subjected to fatigue loading. The number of cycles may only be in hundreds or thousands, but usually they must be designed for millions and millions of cycles such that an infinite life is desired.
 Mechanical Engineers Pocket Book Premium Membership Required to view Document/Book
 Parallel Springs Stiffness Constant Equations and Calculator
 Series and Parallel Spring Rate Formula and Calculator
 Series and Parallel Mounted Springs Stiffness Constant Equations and Calculator
 Tapered Flat spring cantilevered design equations and calculator
 Torsion Spring Calculator
 Torsion Applied Spring Stiffness Constant Equations and Calculator
 CoilDiameter Tolerances of Torsion Springs Specifications
 Series Mounted Springs Stiffness Constant Equations and Calculator
 Spring Helix Wire Length Formula and Calculator
 Spring Properties and Material
 Spring Terminology
 Springs Made From Rectangular Section Bar Steel Design and Calculations