Mainspring for Seiko 401-100

Height, diameter, thickness and length

1.40 × 5.5 × 0.07 × 240 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
3577-1	1.40 mm	5.5 mm	0.07 mm	240 mm	Hand-wound, special version (1)

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 172.

🛒 Matching mainspring in our shop

According to the catalogue, this mainspring has a special form (Hand-wound, special version (1)). We therefore do not show shop items automatically here – feel free to write to us. Contact form

🔗 According to the catalogue, the same mainspring (GR 3577-1) also fits

❓ Frequently asked questions

Which mainspring fits the Seiko 401-100?

According to the Générale Ressorts catalogue (height × diameter × thickness × length): 1.40 × 5.5 × 0.07 × 240 mm (GR 3577-1, hand-wound, special version (1)).