Mainspring for BRAC 20 & 23

Height, diameter, thickness and length

1.25 × 11.0 × 0.105 × 420 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
3131	1.25 mm	11.0 mm	0.105 mm	420 mm	Hand-wound, normal end hook

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 29.

🛒 Matching mainspring in our shop

We do not currently have a mainspring with exactly these dimensions in our shop. Feel free to write to us – we can often still find a suitable spring. Contact form · All mainsprings in our shop

🔗 According to the catalogue, the same mainspring (GR 3131) also fits

❓ Frequently asked questions

Which mainspring fits the BRAC 20 & 23?

According to the Générale Ressorts catalogue (height × diameter × thickness × length): 1.25 × 11.0 × 0.105 × 420 mm (GR 3131, hand-wound, normal end hook).