---
description: "Genuine Seiko NH35-NH39 third wheel #0231070. Gear train component restores smooth power transmission and timekeeping accuracy. Japanese quality."
title: "SEIKO (SII) NH35/NH36/NH37/NH38/NH39 Third Wheel #0231070 - Sofly"
image: https://www.soflypart.com/wp-content/uploads/2019/05/NH36T.jpg
---
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- **SEIKO (SII) NH35/NH36/NH37/NH38/NH39 Third Wheel #0231070**
[](https://www.soflypart.com/wp-content/uploads/2019/05/NH36T.jpg)
# SEIKO (SII) NH35/NH36/NH37/NH38/NH39 Third Wheel #0231070
$2.00
You Saved
| Brand | Choose an option SEIKO- 
Clear |
| --- | --- |
### Discount
| Quantity | Discount (%) | Price |
| --- | --- | --- |
| 1 - 2 | — | $2.00 |
| 3 - 4 | 5% | $1.90 |
| 5 - 9 | 7% | $1.86 |
| 10 - 14 | 10% | $1.80 |
| 15+ | 15% | $1.70 |
### Discount
| Quantity | Discount (%) | Price |
| --- | --- | --- |
| 1 - 2 | — | $2.00 |
| 3 - 4 | 5% | $1.90 |
| 5 - 9 | 7% | $1.86 |
| 10 - 14 | 10% | $1.80 |
| 15+ | 15% | $1.70 |
SEIKO (SII) NH35/NH36/NH37/NH38/NH39 Third Wheel #0231070 quantity
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## Product Description
The **SEIKO (SII) NH35/NH36/NH37/NH38/NH39 Third Wheel (#0231070)** is a genuine Japanese-made component for the popular NH series automatic movements. The third wheel is a critical part of the gear train, transmitting rotational power from the center wheel through the gear train to the second reduction wheel and fourth wheel, ultimately driving the hands with stable torque for accurate timekeeping. This brand new original part is essential for watchmakers restoring smooth power transmission and timekeeping accuracy when the original third wheel becomes worn or damaged.
## Features & Function
- **Genuine Seiko/SII part** – authentic Japanese-made component for NH35, NH36, NH37, NH38, and NH39 movements
- **Gear train component** – transmits power from the center wheel to the second reduction wheel and fourth wheel
- **NH family compatibility** – compatible across the most popular NH series calibers
- **Direct replacement** – drop-in replacement for worn or damaged third wheels
## Specifications
- **Part Number**: 0231070
- **Compatible Movements**: Seiko NH35, NH36, NH37, NH38, NH39 (also known as 4R35/36/37/38/39)
- **Movement Family**: NH Series (Basic Mechanical Series)
- **Movement Diameter**: 27.4 mm
- **Movement Height**: 5.32 mm
- **Jewels**: 24
- **Frequency**: 21,600 vph (3 Hz)
- **Power Reserve**: >41 hours
- **Hacking**: Yes
- **Hand-Winding**: Yes
- **Origin**: Japan
## Applications
- **Service and overhaul** – replacing worn or damaged third wheels in NH series movements
- **Gear train restoration** – ensuring smooth power transmission and stable 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 NH series is manufactured by Seiko Instruments Inc. (SII) and distributed by Time Module Inc. (TMI). The NH prefix indicates the movement is sold without Seiko branding for use by third-party watch manufacturers and the mod community.
**2. Which movements is this third wheel compatible with?**
This third wheel 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) . The gear train components are shared across these calibers.
**3. What are the signs that the third wheel needs replacement?**
Common signs include **irregular timekeeping, low amplitude, or visible wear/damage** to the teeth during movement inspection. The NH series has a factory accuracy specification of -20 to +40 seconds/day . 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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The third wheel is a critical part of the gear train, transmitting rotational power from the center wheel through the gear train to the second reduction wheel and fourth wheel, ultimately driving the hands with stable torque for accurate timekeeping. This brand new original part is essential for watchmakers restoring smooth power transmission and timekeeping accuracy when the original third wheel becomes worn or damaged. Features & Function Genuine Seiko/SII part\u00a0\u2013 authentic Japanese-made component for NH35, NH36, NH37, NH38, and NH39 movements Gear train component\u00a0\u2013 transmits power from the center wheel to the second reduction wheel and fourth wheel NH family compatibility\u00a0\u2013 compatible across the most popular NH series calibers Direct replacement\u00a0\u2013 drop-in replacement for worn or damaged third wheels Specifications Part Number: 0231070 Compatible Movements: Seiko NH35, NH36, NH37, NH38, NH39 (also known as 4R35/36/37/38/39)\u00a0 Movement Family: NH Series (Basic Mechanical Series)\u00a0 Movement Diameter: 27.4 mm\u00a0 Movement Height: 5.32 mm\u00a0 Jewels: 24\u00a0 Frequency: 21,600 vph (3 Hz)\u00a0 Power Reserve: >41 hours\u00a0 Hacking: Yes\u00a0 Hand-Winding: Yes\u00a0 Origin: Japan Applications Service and overhaul\u00a0\u2013 replacing worn or damaged third wheels in NH series movements Gear train restoration\u00a0\u2013 ensuring smooth power transmission and stable timekeeping Suitable for\u00a0professional watchmakers\u00a0and\u00a0experienced repair technicians FAQs 1. Is this a genuine Seiko/SII part? Yes, this is a\u00a0genuine Seiko (SII/TMI) factory part\u00a0made in Japan. The NH series is manufactured by Seiko Instruments Inc. (SII) and distributed by Time Module Inc. (TMI). The NH prefix indicates the movement is sold without Seiko branding for use by third-party watch manufacturers and the mod community.\u00a0 2. Which movements is this third wheel compatible with? This third wheel is compatible with\u00a0Seiko NH35, NH36, NH37, NH38, and NH39\u00a0movements. These are all based on the same NH35 architecture, with differences in complications (date, day-date, 24-hour indicator, open heart)\u00a0. The gear train components are shared across these calibers.\u00a0 3. What are the signs that the third wheel needs replacement? Common signs include\u00a0irregular timekeeping, low amplitude, or visible wear/damage\u00a0to the teeth during movement inspection. The NH series has a factory accuracy specification of -20 to +40 seconds/day\u00a0. 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\u00a0info@soflypart.com\u00a0or WhatsApp\u00a0+86 18620212114.","image":"https://www.soflypart.com/wp-content/uploads/2019/05/NH36T-150x150.jpg","offers":{"@type":"Offer","description":"Product Description The\u00a0SEIKO (SII) NH35/NH36/NH37/NH38/NH39 Third Wheel (#0231070)\u00a0is a genuine Japanese-made component for the popular NH series automatic movements. The third wheel is a critical part of the gear train, transmitting rotational power from the center wheel through the gear train to the second reduction wheel and fourth wheel, ultimately driving the hands with stable torque for accurate timekeeping. This brand new original part is essential for watchmakers restoring smooth power transmission and timekeeping accuracy when the original third wheel becomes worn or damaged. Features & Function Genuine Seiko/SII part\u00a0\u2013 authentic Japanese-made component for NH35, NH36, NH37, NH38, and NH39 movements Gear train component\u00a0\u2013 transmits power from the center wheel to the second reduction wheel and fourth wheel NH family compatibility\u00a0\u2013 compatible across the most popular NH series calibers Direct replacement\u00a0\u2013 drop-in replacement for worn or damaged third wheels Specifications Part Number: 0231070 Compatible Movements: Seiko NH35, NH36, NH37, NH38, NH39 (also known as 4R35/36/37/38/39)\u00a0 Movement Family: NH Series (Basic Mechanical Series)\u00a0 Movement Diameter: 27.4 mm\u00a0 Movement Height: 5.32 mm\u00a0 Jewels: 24\u00a0 Frequency: 21,600 vph (3 Hz)\u00a0 Power Reserve: >41 hours\u00a0 Hacking: Yes\u00a0 Hand-Winding: Yes\u00a0 Origin: Japan Applications Service and overhaul\u00a0\u2013 replacing worn or damaged third wheels in NH series movements Gear train restoration\u00a0\u2013 ensuring smooth power transmission and stable timekeeping Suitable for\u00a0professional watchmakers\u00a0and\u00a0experienced repair technicians FAQs 1. Is this a genuine Seiko/SII part? Yes, this is a\u00a0genuine Seiko (SII/TMI) factory part\u00a0made in Japan. The NH series is manufactured by Seiko Instruments Inc. (SII) and distributed by Time Module Inc. (TMI). The NH prefix indicates the movement is sold without Seiko branding for use by third-party watch manufacturers and the mod community.\u00a0 2. Which movements is this third wheel compatible with? This third wheel is compatible with\u00a0Seiko NH35, NH36, NH37, NH38, and NH39\u00a0movements. These are all based on the same NH35 architecture, with differences in complications (date, day-date, 24-hour indicator, open heart)\u00a0. The gear train components are shared across these calibers.\u00a0 3. What are the signs that the third wheel needs replacement? Common signs include\u00a0irregular timekeeping, low amplitude, or visible wear/damage\u00a0to the teeth during movement inspection. The NH series has a factory accuracy specification of -20 to +40 seconds/day\u00a0. 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