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F E D 1 2

Software for Calculation of Rubber Springs

(C) Copyright 2003-2024 by HEXAGON Software, Berlin

Calculation of Rubber Springs

FED12 calculates characteristic line of spring (load-path diagram), pressure and deformation of cylindrical compression springs with and w/o bore, made from rubber or elastomere material. Material can be selected from integrated database. Load-path curve of rubber springs is progressive due to variation of pressure area and form factor at deformation process. Modulus of elasticity for elastomere materials depends on form factor. Form factor k is the ratio of pressure area to free deformation area. Under load, rubber spring deforms from cylindrical to barrel shape.

Material Database

The material database of FED12 provides material properties and parameters of modulus of elasticity as function of form factor for most essential elastomere materials. The user can add new materials to database.


FED12 calculates characteristic line of spring (load-path diagram) as function of spring travel and spring length. FED12 plots the curves of spring rate (spring load / spring travel) in dependance of spring travel, and modulus of elasticity as function of form factor k.


Quick-View provides spring drawing, load-path diagram, and a table with essential results on one screen.


Calculation results with spring loads, pressure and deformation data can be printed, saved as text or HTML file, or exported to MS-Excel.

Spring Drawing

FED12 generates a true-scale drawing of the rubber spring ready for export to CAD. Or set spring length between L0 and Ln, FED12 draws deformed rubber spring in barrel shape.

Production Drawing

FED12 generates a production drawing of the rubber spring, ready for printout.



Deformation of a rubber spring between two spring positions can be simulated on screen.

HEXAGON-Help System

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

Export Formats

DXF, IGES, HTML, TXT, DBF, Excel, F12.

Import Formats

TXT, DBF, Excel, F12.

System Requirements

FED12 is available as 32-bit or 64-bit application for Windows 11, Windows 10, Windows 7.

Information and Update Service

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

Scope of Delivery

FED12 program, user manual (pdf), perpetual license for an indefinite right-to-use time.


HEXAGON gives a 24 month guarantee on full functionality of the software.

Download FED12 Demo for Windows (606 kB)

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