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The SEIKO (SII) NH35/NH36 Yoke Spring is a genuine Japanese‑made component designed for the keyless works mechanism of these popular automatic movements. As a small but essential spring, it provides the tension required for the yoke to engage correctly with the winding pinion, enabling smooth and reliable switching between the winding (position 0) and time‑setting (position 2) crown modes. This brand‑new original part is the ideal choice for restoring proper crown operation when the original spring becomes worn, lost, or damaged.
Genuine Seiko/SII part – authentic Japanese‑made component for NH35 and NH36 movements
Keyless works component – provides tension for the yoke to engage the winding pinion
Enables smooth mode switching – ensures reliable transition between winding and time‑setting positions
Direct replacement – drop‑in replacement for worn, lost, or damaged yoke springs
Compatible Movements: Seiko NH35, NH36 (also known as 4R35/4R36)
Movement Family: NH Series (Basic Mechanical Series)
Movement Frequency: 21,600 vph (3 Hz)
Jewels: 24
Power Reserve: ~41 hours
Hacking: Yes (seconds hand stops when crown pulled to position 2)
Hand‑Winding: Yes (position 0, clockwise)
Winding System: Bi‑directional (Magic Lever)
Origin: Japan
Service and overhaul – replacing worn, lost, or damaged yoke springs in NH35/NH36 movements
Keyless works repair – restoring proper crown operation after disassembly issues
Crown function restoration – ensuring smooth winding and time‑setting operation
Suitable for professional watchmakers and experienced repair technicians
1. Is this a genuine Seiko/SII part?
Yes, this is a genuine Seiko (SII/TMI) factory part made in Japan. The NH series is manufactured by Seiko Instruments Inc. (SII) and distributed by Time Module Inc. (TMI).
2. Which movements is this yoke spring compatible with?
This yoke spring is compatible with Seiko NH35 and NH36 movements. The NH35 has a date complication only, while the NH36 includes both day and date. Both share the same keyless works architecture.
3. What are the signs that the yoke spring needs replacement?
Common signs include stiff crown operation, difficulty switching between winding and time‑setting positions, or the crown not staying in position. The yoke spring is a known part of the keyless works that can become displaced or lose tension during servicing or after a hard impact.
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