---
description: Genuine Seiko NH05/NH06 fourth wheel for compact automatic movement. Gear train component restores accurate timekeeping. Japanese quality.
title: SEIKO (SII) NH05/NH06 Fourth Wheel - Sofly
image: https://www.soflypart.com/wp-content/uploads/2019/05/NH05SL.jpg
---
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- **SEIKO (SII) NH05/NH06 Fourth Wheel**
[](https://www.soflypart.com/wp-content/uploads/2019/05/NH05SL.jpg)
# SEIKO (SII) NH05/NH06 Fourth Wheel
$1.50
You Saved
| Brand | Choose an option SEIKO- 
Clear |
| --- | --- |
### Discount
| Quantity | Discount (%) | Price |
| --- | --- | --- |
| 1 - 2 | — | $1.50 |
| 3 - 4 | 5% | $1.43 |
| 5 - 9 | 7% | $1.40 |
| 10 - 14 | 10% | $1.35 |
| 15+ | 15% | $1.28 |
### Discount
| Quantity | Discount (%) | Price |
| --- | --- | --- |
| 1 - 2 | — | $1.50 |
| 3 - 4 | 5% | $1.43 |
| 5 - 9 | 7% | $1.40 |
| 10 - 14 | 10% | $1.35 |
| 15+ | 15% | $1.28 |
SEIKO (SII) NH05/NH06 Fourth Wheel quantity
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## Product Description
The **SEIKO (SII) NH05/NH06 Fourth Wheel** is a genuine Japanese-made component for these compact automatic movements, measuring 7¾”’ (approx. 17.5mm) in diameter . As a key part of the gear train, the fourth wheel transmits power from the third wheel to the escape wheel and pallet fork, playing a critical role in regulating the movement’s timekeeping accuracy. This brand new original part is essential for watchmakers restoring proper power transmission and timekeeping function when the original gear train component becomes worn or damaged.
## Features & Function
- **Genuine Seiko/SII part** – authentic Japanese-made component for NH05 and NH06 movements
- **Gear train component** – transmits power from the third wheel to the escape wheel and pallet fork for accurate timekeeping
- **21-jewel movement** – part of the 21-jewel NH0 series architecture
- **NH0 family compatibility** – designed for the compact 7¾”’ NH05 (date) and NH06 (day-date) calibers
## Specifications
- **Compatible Movements**: Seiko NH05 (date), NH06 (day-date)
- **Movement Family**: NH0 Series
- **Movement Size**: 7¾”’ (approx. 17.5mm)
- **Movement Height**: 5.92mm
- **Jewels**: 21
- **Frequency**: 21,600 vph (3 Hz)
- **Power Reserve**: >40 hours
- **Crown Positions**: Normal (manual winding), 1st click (date/day setting), 2nd click (time setting)
- **Origin**: Japan
## Applications
- **Service and overhaul** – replacing worn or damaged fourth wheels in NH05/NH06 movements
- **Gear train restoration** – ensuring stable power delivery to the escapement for accurate timekeeping
- 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 NH05 and NH06 are manufactured by Seiko Instruments Inc. (SII) and distributed by Time Module Inc. (TMI) .
**2. Which movements is this fourth wheel compatible with?**
This fourth wheel is designed for **Seiko NH05 and NH06** movements. The NH05 features a date display, while the NH06 adds a day-date complication, but both share the same basic gear train architecture .
**3. What are the signs that the fourth wheel needs replacement?**
Common signs include **worn or damaged teeth, irregular timekeeping, low amplitude**, or **visible wear** during movement inspection. A qualified watchmaker can diagnose these issues during servicing.
## Why Choose SOFLY Watch Parts?
- Fast worldwide shipping within 3 business days.
- Competitive pricing on Seiko/Hattori calibers.
- 3,000+ watch movements and parts in stock.
- Trusted by watchmakers worldwide.
- Personalized sourcing support via **info@soflypart.com** or WhatsApp **+86 18620212114**.
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This brand new original part is essential for watchmakers restoring proper power transmission and timekeeping function when the original gear train component becomes worn or damaged. Features & Function Genuine Seiko/SII part\u00a0\u2013 authentic Japanese-made component for NH05 and NH06 movements Gear train component\u00a0\u2013 transmits power from the third wheel to the escape wheel and pallet fork for accurate timekeeping 21-jewel movement\u00a0\u2013 part of the 21-jewel NH0 series architecture\u00a0 NH0 family compatibility\u00a0\u2013 designed for the compact 7\u00be''' NH05 (date) and NH06 (day-date) calibers\u00a0 Specifications Compatible Movements: Seiko NH05 (date), NH06 (day-date) Movement Family: NH0 Series Movement Size: 7\u00be''' (approx. 17.5mm)\u00a0 Movement Height: 5.92mm\u00a0 Jewels: 21\u00a0 Frequency: 21,600 vph (3 Hz)\u00a0 Power Reserve: >40 hours\u00a0 Crown Positions: Normal (manual winding), 1st click (date/day setting), 2nd click (time setting)\u00a0 Origin: Japan Applications Service and overhaul\u00a0\u2013 replacing worn or damaged fourth wheels in NH05/NH06 movements Gear train restoration\u00a0\u2013 ensuring stable power delivery to the escapement for accurate timekeeping Suitable for\u00a0professional watchmakers\u00a0and\u00a0experienced repair technicians FAQs 1. 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