Mainspring for ETA 2728 Aut

Height, diameter, thickness and length

1.25 × 11.0 × 0.135 × 400 mmheight × diameter × thickness × length

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.

📏 Mainspring dimensions

GR no.	Height	Diameter	Thickness	Length	Type
3150-X	1.25 mm	11.0 mm	0.135 mm	400 mm	Automatic, with welded slipping bridle

All dimensions in millimetres. The height of a mainspring is often also called its “width”. Source: Générale Ressorts, mainspring catalogue GR 2 (March 1974), page 69.

🛒 Matching mainspring in our shop

Mainspring 1,25-11,0-0,135-400 ETA 272416,90 € incl. VAT *View item

Mainspring ETA 2724 1,25-11-0,135-40014,90 € incl. VAT *View item

Only mainsprings with exactly the same height, thickness and length are shown; the diameter is equal or up to 1 mm smaller – a smaller spring settles in the barrel.

🔧 Interchangeable spare parts

Which other spare parts of ETA 2728 fit other calibers:

Interchangeability ETA 2728

🔗 According to the catalogue, the same mainspring (GR 3150-X) also fits

❓ Frequently asked questions

Which mainspring fits the ETA 2728 Aut?

According to the Générale Ressorts catalogue (height × diameter × thickness × length): 1.25 × 11.0 × 0.135 × 400 mm (GR 3150-X, automatic, with welded slipping bridle).