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F E D 7

Software for Calculation of Non-linear Compression Springs of Any Shape

(C) Copyright 1996-2024 by HEXAGON, Berlin

FED7 calculates spring path, spring forces and shearing stress for compression springs of any shape. The curves and schematic spring drawings can be graphically displayed and exported to CAD or word-processing programs via DXF files.


The spring rate, and with it the degree of progression, is determined by dividing the spring into up to 500 cylindrical sections and by entering length, coil number, coil diameter and wire diameter of each section. FED7 then calculates all necessary spring forces, spring path, spring rate, spring operation, shearing stress, wire lengths and weight for the defined spring.

Special Shapes

For conical, barrel and waisted pressure springs FED7 generates the necessary spring sections. Differing special shapes can be combined in any variation and extended by cylindrical sections.

Spring Drawing and Animation

Schematic spring drawings of any clamping length can be graphically displayed and exported to CAD via DXF or IGES files. The different length changes of the individual coil sections under load are taken into account. The compliance between any two positions can be simulated on screen in an animation.


The courses for the spring curve, spring rate and spring operations are shown on screen as a diagram. Each screen graphic can be printed out on laser, ink jet or needle printers, or exported to CAD and word-processing programs via the DXF or IGES interface.

Spring Curve and Spring Rate

The curve of a non-linear pressure spring becomes progressive as soon as the first coils begin to flatten (Force Path Diagram). The curves for spring rate and spring force are shown in the diagram as functions in relation to spring path.

Spring Operation

The spring operation results from the integral of the spring curve.

Goodman Diagram

The fatigue stress diagram shows whether or not the permissible elevation stress has been adhered to for dynamically loaded springs. The curves for fatigue stress (>10 mill.) as well as for one million and 100,000 repetitions are included in the diagram.

Quick Output

The Quick Output displays the most important spring data and the spring curve on one screen.

Material Data Base

FED7 obtains the values for the most important spring materials (tensile strength, permissible shearing stress in relation to wire diameter, shearing modulus, E modulus, density) from the integrated data base.

Production Drawing

Hardware and Software Requirements

FED7 is available as 32-bit or 64-bit application for Windows 11, Windows 10, Windows 7.

Scope of Delivery

The FED7 software (including sample files, auxiliary pictures, help text), user manual (pdf), input form, license agreement for indefinite period of time.


HEXAGON gives a 24 month guarantee for full software functionality.

Software Update Service and Hotline

HEXAGON Software is continuously improved and updated. Customers are regularly informed about updates and new editions.

Download FED7 Demo for Windows 7/8/10/11 (767 kB)

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