SEIKO (SII) NH35/NH36/NH37/NH38/NH39 Click #0381004

Product Description

The SEIKO (SII) NH35/NH36/NH37/NH38/NH39 Click (#0381004) is a genuine Japanese-made component for the popular NH series automatic movements. The click is a critical component of the movement’s automatic winding system, located under the rotor, responsible for locking the gear during rotor rotation to ensure unidirectional movement and prevent reverse rotation. This brand new original part is essential for watchmakers restoring proper automatic winding function when the original click becomes worn or damaged.

Features & Function

• Genuine Seiko/SII part – authentic Japanese-made component for NH35, NH36, NH37, NH38, and NH39 movements

• Automatic winding system component – locks the gear during rotor rotation to ensure unidirectional movement

• Prevents reverse rotation – ensures stable power transmission during automatic winding

• Direct replacement – drop-in replacement for worn or damaged clicks

Specifications

• Part Number: 0381004

• 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

• Winding System: Bi-directional automatic with unidirectional click locking

• Origin: Japan

Applications

• Service and overhaul – replacing worn or damaged clicks in NH series movements

• Automatic winding repair – resolving issues with rotor locking or reverse rotation

• Suitable for professional watchmakers and experienced repair technicians

FAQs

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 click compatible with?

This click is compatible with Seiko NH35, NH36, NH37, NH38, and NH39 movements. These are all based on the same NH35 architecture, with differences in complications (day/date/24-hour/open heart).

3. What is the function of the click in the automatic winding system?

The click locks the gear during rotor rotation to ensure unidirectional movement and prevent reverse rotation. If the click becomes worn, the automatic winding may become noisy or less efficient.

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