Unitas 640 – interchangeable spare parts
Unitas (UT) 640 movement
Which spare parts fit the Unitas 640 movement? For every part you can see which other calibers use the same part according to the original interchangeability list.
🔧 Interchangeable parts
Source: original interchangeability lists of Unitas (UT) (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 Unitas 640 (height × diameter × thickness × length) and matching mainspring in our shop:
🔗 Movements sharing the most parts
- Unitas 650 (38 parts)
- Unitas 6340 (35 parts)
- Unitas 6342 (35 parts)
- Unitas 6343 (35 parts)
- Unitas 6340N (29 parts)
- Unitas 6342N (29 parts)
- Unitas 6343N (29 parts)
- Unitas 620 (27 parts)
- Unitas 600 (26 parts)
- Unitas 6450 (24 parts)
- Unitas 6452 (24 parts)
- Unitas 176 (24 parts)
- Unitas 6310 (23 parts)
- Unitas 6460 (22 parts)
- Unitas 6312 (22 parts)
- Unitas 6311 (21 parts)
❓ Frequently asked questions
Which Unitas 640 spare parts also fit other movements?
For the Unitas 640, 31 part numbers are listed as interchangeable. Together they fit 72 other calibers – the table below shows which part fits which movement.
Which movements share the most parts with the Unitas 640?
The most shared parts: Unitas 650 (38 parts), Unitas 6340 (35 parts), Unitas 6342 (35 parts).
Which mainspring fits the Unitas 640?
According to the Générale Ressorts catalogue (height × diameter × thickness × length): 1.50 × 11.5 × 0.135 × 360 mm (GR 4208, hand-wound, normal end hook).
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