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The ETA 2892-728 Balance Axle is a genuine Swiss-made component for the ETA 2892 automatic movement family. The balance axle (also known as the balance staff) is the central pivot for the balance wheel, serving as the axis around which the balance wheel oscillates and regulates the release of energy from the gear train. This brand new original part is essential for watchmakers restoring correct amplitude and rate accuracy when the original balance staff becomes broken, bent, or worn. The ETA 2892 is a 25.6 mm premium automatic movement used extensively by mid-range and high-end brands including IWC, Omega, and Cartier.
Genuine ETA part – authentic Swiss-made component for ETA 2892 and compatible calibers
Balance staff – central pivot for the balance wheel, enabling oscillation
Critical for timekeeping – directly affects amplitude and rate stability
Incabloc shock system compatible – designed for use with the 2892’s Incabloc shock protection
Direct replacement – drop-in replacement for broken or worn balance staffs
Part Number: 2892-728 / 728
Compatible Movements: ETA 2890, 2891, 2892, 2892-2, 2892-A2, 2893, 2894, 2895, 2896, 2897
Movement Diameter: 25.6 mm (11½”’)
Movement Height: 3.60 mm
Jewels: 21
Frequency: 28,800 vph (4 Hz)
Power Reserve: ~42 hours
Shock Protection: Incabloc
Origin: Switzerland (ETA factory part)
Condition: Brand new
Service and overhaul of ETA 2892 family movements
Balance staff replacement – replacing broken, bent, or worn pivots
Timekeeping restoration – restoring correct amplitude and rate when balance staff is damaged
Suitable for professional watchmakers and experienced repair technicians
1. Is this a genuine ETA part?
Yes, this is a genuine ETA factory part (reference 2892-728), made in Switzerland. It is listed in authorized parts documentation for ETA 2890, 2891, 2892(A2), 2893, 2894, 2895, 2896, and 2897 calibers.
2. Which movements is this balance axle compatible with?
This balance axle is compatible with ETA 2890, 2891, 2892, 2892-2, 2892-A2, 2893, 2894, 2895, 2896, and 2897 calibers. The 2892-A2 is a 25.6 mm automatic movement with a slim 3.6 mm height, extensively used by mid-range and high-end brands such as IWC, Omega, and Cartier.
3. What is the function of the balance staff?
The balance staff is the central axle of the balance wheel. It allows the balance to oscillate freely and precisely, which is fundamental to the movement’s timekeeping accuracy. A broken or bent staff will cause erratic rate or complete stoppage. Along with the hairspring, the balance wheel and staff form a harmonic oscillator that regulates the gear train’s pace.
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