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This is a genuine click designed for the Seiko NH35, NH36, NH37, NH38, and NH39 automatic movements, with part number 0381-004, Made in Japan. 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. As an original factory part, it is the ideal choice for replacing worn or damaged components during service or repair.
| Feature | Description |
|---|---|
| Compatible Movements | SEIKO NH35, NH36, NH37, NH38, NH39 |
| Part Number | 0381-004 (also listed as 0381004) |
| Part Name | Click |
| System | Automatic Winding System |
| Core Function | Locks the gear during rotor rotation to ensure unidirectional movement and prevent reverse energy flow |
| Material | High-tensile steel, precision machined |
| Origin | Made in Japan |
| Product Type | Genuine SEIKO part |
NH Series Technical Background:
| Parameter | Value |
|---|---|
| Movement Type | Self-winding mechanical |
| Diameter | 27.4 mm |
| Thickness | NH35/36: 5.32 mm / NH37/38/39: 5.6 mm |
| Jewels | NH35/36: 24 / NH37/38/39: 21-24 |
| Power Reserve | Approx. 41 hours |
| Frequency | 21,600 vph (3 Hz) |
| Winding Type | Bi-directional automatic + manual |
| Function Differences | NH35: no day / NH36: with day / NH37: 24h display / NH38: no date / NH39: 24h display + day |
| Instruction | Details |
|---|---|
| Primary Use | As a core component of the automatic winding system, the click works with the pawl lever to ensure unidirectional rotor rotation |
| Operation Principle | When the rotor rotates, the click engages with the teeth of the pawl wheel, preventing reverse rotation and transferring kinetic energy to the mainspring |
| Normal Function | Rotor should feel smooth when oscillating – no unusual noise; normal wear provides automatic winding |
| Failure Symptoms | Worn click causes: reduced automatic winding efficiency, unusual “clicking” noise when rotor spins, insufficient power reserve |
1. Remove Automatic Module:Open the case back, carefully remove the movement, and remove the rotor
2. Remove Automatic Bridge:Remove the automatic winding bridge to expose the click and pawl wheel
3. Remove Old Click:Carefully remove the old click (0381-004) – check the spring for deformation or breakage
4. Cleaning:Clean the click mounting area and related gears – remove old oil and debris
5. Inspect Related Parts:Check the pawl wheel teeth for wear – replace if worn
6. Install New Click:Place the new click in position – ensure the spring end correctly engages the positioning slot
7. Install Automatic Bridge:Reinstall the automatic bridge and tighten fixing screws
8. Testing:After reinstalling the rotor, gently rotate the rotor to check for normal click operation and no sticking
Important Note: The NH series automatic winding system includes both the click and the pawl wheel. Ensure the click spring is properly seated – otherwise automatic winding may fail. Professional installation by a watchmaker is recommended.
| Note | Details |
|---|---|
| Movement Confirmation | This click is specifically for SEIKO NH35, NH36, NH37, NH38, and NH39 movements – verify movement model before purchase |
| Part Number Confirmation | Part number is 0381-004 (also listed as 0381004) – verify before purchase |
| Simultaneous Inspection | If the click is severely worn, inspect and replace the pawl wheel at the same time – wear is often synchronized |
| Spring Caution | The click has a small spring structure – handle with care to avoid deformation or breakage |
| Lubrication Requirement | Apply microscopic specialized lubricant to click contact points – do not over-lubricate; spring typically requires no lubrication |
| Professional Advice | Automatic module disassembly required – professional installation by a watchmaker is recommended |
| Aspect | Guidance |
|---|---|
| Inspection Period | Inspect the click spring for deformation or wear during each movement service |
| Wear Indicators | Signs of wear include: unusual “clicking” noise when rotor spins, reduced automatic winding efficiency, rotor free-spinning without winding |
| Cleaning Method | Use specialized cleaning solution and ultrasonic equipment; avoid corrosive cleaners |
| Lubrication | Apply microscopic specialized lubricant to contact points between click and pawl wheel |
| Replacement Interval | Replace immediately if the spring is deformed, worn, or broken |
| Service Advice | NH series movements should be professionally serviced every 3-5 years |
Q1: What is the function of the click in an NH movement?
A: The click is part of the automatic winding system. It engages with the pawl wheel to ensure the rotor rotates in only one direction when winding, preventing reverse rotation and maintaining winding efficiency.
Q2: Which Seiko movements use the 0381-004 click?
A: This click (part 0381-004) is used in the SEIKO NH35, NH36, NH37, NH38, and NH39 movements . These are widely used automatic calibers in many microbrand and aftermarket watches.
Q3: What are the symptoms of a worn click?
A: Symptoms include: a loud clicking noise when the rotor spins, reduced power reserve (the watch stops after less than 40 hours), or the rotor spins freely without winding the mainspring.
Q4: Can I replace the click myself?
A: This repair requires movement disassembly and careful handling of small spring components. If you have experience with automatic module service, it is possible. However, professional installation by a watchmaker is strongly recommended.
Q5: Is this a genuine Seiko part?
A: Yes, this is a genuine SEIKO (SII – Seiko Instruments Inc.) factory part, made in Japan, and brand new.
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