Forster (FB) – mainsprings for all calibers

46 calibers with mainspring dimensions

Choose the caliber of your Forster movement. The caliber page shows the mainspring dimensions and – if in stock – the matching mainspring from our shop.

Note: We have transcribed this information to the best of our knowledge from the Générale Ressorts mainspring catalogue (GR 2, 1974). All information has been carefully checked but is provided without guarantee. Please check yourself before fitting that the mainspring fits, in particular height, diameter, thickness and length.

⚙️ All calibers

Forster 0–99

Forster 100–199

Forster 200–299

Forster 300–399

Forster 400–499

Forster 500–599

Forster 600–699

Forster 800–899

Forster 1100–1199

Forster 2000–2099

🛠️ For the workshop

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