Contact
Frankfurter Straße 76
58553 Halver
Deutschland
Telephone: +49 (0) 2353 - 4098
Fax: +49 (0) 2353 - 4301
e-mail: federn@febrotec.de
Expert customer advice from 8.00 am – 4.30 pm Monday to Friday.

Abbreviation |
Designation |
| d | Wire / Bar diameter |
| Da | Outer diameter |
| Di | Inner diameter |
| D | Mean diameter |
| F | Spring force |
| L0 |
Length of unloaded spring |
| L1 |
Spring length at load F1 |
| L2 |
Spring length at load F2 |
| Lc | Solid height |
| Ln |
Minimal spring length allowed |
| LK |
Length of spring body |
| LH | Hook height |
| n |
Number of spring coils |
| S | Spring deflection |
| R | Spring rate |
| m | Hook opening |