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The SEIKO (SII) NH35/NH36/NH37/NH38/NH39 Winding Pinion (#0283020) is a genuine Japanese-made component for the popular NH series automatic movements. As a key part of the keyless works mechanism, the winding pinion engages with the crown wheel to transfer manual winding motion from the crown to the mainspring, enabling hand-winding of the movement. This brand new original part is essential for watchmakers restoring proper manual winding function when the original winding pinion becomes worn or damaged.
Genuine Seiko/SII part – authentic Japanese-made component for NH35, NH36, NH37, NH38, and NH39 movements
Keyless works component – transfers manual winding motion from the crown to the mainspring
NH family compatibility – compatible across the most popular NH series calibers
Direct replacement – drop-in replacement for worn or damaged winding pinions
Part Number: 0283020
Compatible Movements: Seiko NH35, NH36, NH37, NH38, NH39 (also known as 4R35/36/37/38/39)
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 automatic (Magic Lever)
Origin: Japan
Service and overhaul – replacing worn or damaged winding pinions in NH series movements
Keyless works repair – restoring proper manual winding function after disassembly issues
Manual winding restoration – ensuring smooth crown winding 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 winding pinion compatible with?
This winding pinion is compatible with Seiko NH35, NH36, NH37, NH38, and NH39 movements. These are all based on the same NH35 architecture, with differences in complications (date, day-date, 24-hour indicator, open heart/skeleton).
3. What are the signs that the winding pinion needs replacement?
Common signs include difficulty winding the crown, rough winding feel, clicking sounds during winding, or visible wear/damage to the teeth during inspection. A qualified watchmaker can diagnose these issues during servicing.
Fast worldwide shipping within 3 business days.
Competitive pricing on Seiko/Hattori calibers.
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