SEIKO (SII) NH05/NH06 Center Seconds Pinion

Product Description

The SEIKO (SII) NH05/NH06 Center Seconds Pinion is a genuine Japanese-made component for these compact automatic movements. As a core part of the motion work, the center seconds pinion transmits power from the gear train to drive the central seconds hand, enabling smooth and accurate time display. This brand new original part is essential for watchmakers restoring proper seconds hand function when the original component becomes worn or damaged.

Features & Function

• Genuine Seiko/SII part – authentic Japanese-made component for NH05 and NH06 movements

• Motion work component – drives the central seconds hand 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

• Direct replacement – drop-in replacement for worn or damaged center seconds pinions

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 center seconds pinions in NH05/NH06 movements

• Motion work restoration – ensuring smooth and accurate seconds hand operation

• 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 center seconds pinion compatible with?

This center seconds pinion 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 motion work architecture .

3. What are the signs that the center seconds pinion needs replacement?

Common signs include seconds hand not moving smoothly, stopping, or irregular timekeeping, or visible wear/damage during movement inspection. A bent center seconds pinion can also cause hands to jam . A qualified watchmaker can diagnose these issues.

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.