ETA 2821 – interchangeable spare parts
ETA 2821 movement
Which spare parts fit the ETA 2821 movement? For every part you can see which other calibers use the same part according to the original interchangeability list.
🛒 Spare parts for ETA 2821 in our shop
🔧 Interchangeable parts
Source: original interchangeability lists of ETA (checked transcription) and checked original spare-part labels · as of 2026-10-28. Height / execution: the part fits only in this height or execution.
🌀 Matching mainspring
Mainspring dimensions for ETA 2821 (height × diameter × thickness × length) and matching mainspring in our shop:
🔗 Movements sharing the most parts
- ETA 2824 (61 parts)
- ETA 2820 (57 parts)
- ETA 2801 (56 parts)
- ETA 2821-1 (53 parts)
- ETA 2824-1 (53 parts)
- ETA 2830 (53 parts)
- ETA 2821-2 (51 parts)
- ETA 2824-2 (51 parts)
- ETA 2834 (48 parts)
- ETA 2836 (48 parts)
- ETA 2826 (47 parts)
- ETA 2822 (46 parts)
- ETA 2804 (44 parts)
- ETA 2832 (43 parts)
- ETA 2834-1 (42 parts)
- ETA 2836-1 (42 parts)
❓ Frequently asked questions
Which ETA 2821 spare parts also fit other movements?
For the ETA 2821, 43 part numbers are listed as interchangeable. Together they fit 173 other calibers – the table below shows which part fits which movement.
Which movements share the most parts with the ETA 2821?
The most shared parts: ETA 2824 (61 parts), ETA 2820 (57 parts), ETA 2801 (56 parts).
Which mainspring fits the ETA 2821?
According to the Générale Ressorts catalogue (height × diameter × thickness × length): 1.25 × 12.0 × 0.125 × 420 mm (GR 3149-X, automatic, with welded slipping bridle).
Can I buy spare parts for the ETA 2821?
Yes, Master Watch Parts currently has 2 matching items in stock.
🛠️ For the workshop
Watch Crystal Sternkreuz ATCR, Domed, Reinforced with Chrome Ring – NOS10,90 € incl. VAT *View item ›
Watch Key Clock Winding Key – Size 0 2.25mm5,99 € – 7,95 € incl. VAT *View item ›
Watch Gasket Hytrel I-Ring Seal for Flat Round Mineral Crystals 16-40 mm, H: 0.6, 0.8, 0.85, 1.25, 1.7 mm5,95 € – 9,95 € incl. VAT *View item ›
