Mainspring for EB 991

Height, diameter, thickness and length

1.70 × 23.0 × 0.24 × 840 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
5150	1.70 mm	23.0 mm	0.24 mm	840 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 53.

🛒 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

❓ Frequently asked questions

Which mainspring fits the EB 991?

According to the Générale Ressorts catalogue (height × diameter × thickness × length): 1.70 × 23.0 × 0.24 × 840 mm (GR 5150, hand-wound, normal end hook).