Mainspring for Rolex 1120

Height, diameter, thickness and length

1.20 × 6.5 × 0.075 × 220 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
2861	1.20 mm	6.5 mm	0.075 mm	220 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 168.

🔗 According to the catalogue, the same mainspring (GR 2861) also fits

📄 Technical document

View the original document for Rolex 1120 online:

Rolex 1120 – Ø 20.00 mm, height 5.25 mm

❓ Frequently asked questions

Which mainspring fits the Rolex 1120?

According to the Générale Ressorts catalogue (height × diameter × thickness × length): 1.20 × 6.5 × 0.075 × 220 mm (GR 2861, hand-wound, normal end hook).