SEIKO (SII) NH35/NH36/NH38 Fourth Wheel And Pinion #0241010

Product Description

The SEIKO (SII) NH35/NH36/NH38 Fourth Wheel and Pinion (#0241010) is a genuine Japanese-made component for the popular NH35, NH36, and NH38 automatic movements. As a critical part of the gear train, the fourth wheel connects to the escape wheel, transmitting power to regulate the movement’s timekeeping accuracy. The integrated pinion ensures precise power transmission, making this brand new original part essential for watchmakers restoring proper movement function when the original component becomes worn or damaged.

Features & Function

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

• Gear train component – connects to the escape wheel for regulating timekeeping accuracy

• Integrated pinion design – ensures precise and efficient power transmission

• Direct replacement – drop-in replacement for worn or damaged fourth wheels

Specifications

• Part Number: 0241010

• Compatible Movements: Seiko NH35, NH36, NH38 (also known as 4R35/4R36/4R38)

• Movement Family: NH Series (Basic Mechanical Series)

• Movement Frequency: 21,600 vph (3 Hz)

• Jewels: 24

• Power Reserve: ~41 hours

• Hacking: Yes

• Hand-Winding: Yes

• Origin: Japan

Applications

• Service and overhaul – replacing worn or damaged fourth wheels in NH35/NH36/NH38 movements

• Gear train restoration – ensuring proper power transmission 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 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 fourth wheel compatible with?

This fourth wheel is compatible with Seiko NH35, NH36, and NH38 movements. The NH35 is date-only, NH36 adds day-date, and NH38 is a no-date open-heart version . The gear train components are shared across these calibers.

3. What are the signs that the fourth wheel needs replacement?

Common signs include irregular timekeeping, low amplitude, or visible wear/damage to the teeth or pinion 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 [email protected] or WhatsApp +86 18620212114.