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Software for Constant Force Springs

(C) Copyright 2016-2020 by HEXAGON Software, Berlin

FED16 - Calculation of Constant Force Springs

FED16 calculates constant force springs made of rolled strip steel. FED16 provides two calculation methods: pre-dimensioning and recalculation.


FED16 calculates spring force, spring travel, bending stress and life cycles. Input data are material thickness, material width, inner coil (drum) diameter, outer coil diameter and natural coil diameter as base diameter for calculation of force and stress.


In pre-dimensioning just enter required force and length (spring travel) and FED16 calculates dimensions of the required constant force spring. You can modify ratio of material width to material thickness as well as permissible stress to calculated stress to influence dimensions and life expectation.


FED16 can be switched between metric units (mm, N. MPa) and imperial units (inch, lbf, psi)

Material Database

Material properties of the most important flat spring materials (tensile strength, permissible shear stress and bending stress as function of material thickness, modulus of elasticity, density) are stored at the integrated material database. The dbf file may be extended and modified by the user.


FED16 calculates force and spring travel (load-extension diagram).


If dynamically loaded, Goodman diagram is useful to calculate fatigue strength safety and bearable load cycles of the spring.

Quick View

Quick View includes tables with dimensions and calculation results and Goodman diagram altogether on one screen.


Input data and calculation results may be printed, saved as text or HTML file, or exported to MS Excel via OLE interface.

Production Drawing

FED16 generates a production drawing of the constant force spring with ISO 7200 title block. Drawing name, date, users and modifications are described in FED16.

HEXAGON Help System

Auxiliary text and images are available for all dialogue windows. If error messages appear, you can get description and remedy suggestion.


Drawings and diagrams can be saved as DXF or IGES file to be loaded with CAD programs.

The OLE interface lets you import/export data from/to Excel.

Export Formats


Import Formats

TXT, DBF, Excel, F16.

System Requirements

FED16 is available as 32-bit app or as 64-bit app for Windows 10, Windows 8, Windows 7.

Scope of Delivery

Program with user manual (pdf), database files, example applications and help images, non-expiring license for unlimited time use with update rights.

Download FED16 Demo for Windows (716 kB)

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