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The SEIKO (SII) NH05/NH06 Escape Wheel is a genuine Japanese-made component for these compact automatic movements. As a critical part of the Swiss lever escapement, the escape wheel works with the pallet fork to regulate the release of energy from the gear train, ensuring stable amplitude and accurate timekeeping. This brand new original part is essential for watchmakers restoring proper escapement function and precision timing when the original escape wheel becomes worn or damaged.
Genuine Seiko/SII part – authentic Japanese-made component for NH05 and NH06 movements
Escapement system component – regulates energy release from the gear train for accurate timekeeping
NH0 family compatibility – designed for the compact 7¾”’ NH05 (date) and NH06 (day-date) calibers
21-jewel movement – part of the 21-jewel NH0 series architecture
Direct replacement – drop-in replacement for worn or damaged escape wheels
Part Number: Please verify with supplier (refers to the escape wheel for NH05/NH06)
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
Service and overhaul – replacing worn or damaged escape wheels in NH05/NH06 movements
Escapement repair – resolving issues with irregular amplitude, unstable rate, or intermittent stopping
Timekeeping restoration – ensuring stable energy transfer for accurate timekeeping
Suitable for professional watchmakers and experienced repair technicians
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 escape wheel compatible with?
This escape 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 movement architecture . The NH05/NH06 are the compact 7¾”’ versions of the NH series, widely used in ladies’ and small watches .
3. What are the signs that the escape wheel needs replacement?
Common signs include irregular amplitude, unstable rate, intermittent stopping, or visible wear/damage to the teeth during inspection. A damaged escape wheel can cause poor timekeeping or complete stoppage. A qualified watchmaker can diagnose these issues during servicing.
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