Mainspring for Seiko 850

Height, diameter, thickness and length

1.20 × 10.0 × 0.115 × 340 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
2963	1.20 mm	10.0 mm	0.115 mm	340 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 173.

🛒 Matching mainspring in our shop

No mainspring with exactly these dimensions in our shop at the moment.

🔄 Alternative mainsprings

Mainspring 1,20-9,5-0,12-310 Texturstahl12,90 € incl. VAT *View item

Same height, diameter equal or slightly smaller. Please check yourself before ordering.

🔗 According to the catalogue, the same mainspring (GR 2963) also fits

❓ Frequently asked questions

Which mainspring fits the Seiko 850?

According to the Générale Ressorts catalogue (height × diameter × thickness × length): 1.20 × 10.0 × 0.115 × 340 mm (GR 2963, hand-wound, normal end hook).