FEF 6640 – interchangeable spare parts

FEF 6640 movement

Which spare parts fit the FEF 6640 movement? For every part you can see which other calibers use the same part according to the original interchangeability list.

16Parts with interchange data
32Calibers sharing parts
Note: We have compiled this overview to the best of our knowledge and belief, based on the original interchangeability lists of FEF and the original spare-part labels. All information has been carefully checked but is provided without guarantee. Please verify the interchangeability yourself before fitting, especially the height, diameter and execution of the part.

🔧 Interchangeable parts

Part no.DescriptionAlso fits
182ISO 20.030Barrel and cover
FEF 165FEF 166
240ISO 31.080Cannon-pinion
FEF 165FEF 166
Height 175
FEF 165FEF 166
Height 200
FEF 165FEF 166
Height 225
FEF 165FEF 166
Height 250
FEF 165FEF 166
Height 275
FEF 165FEF 166
Height 300
FEF 165FEF 166
407ISO 31.121Clutch wheel
FEF 165FEF 166FEF 270FEF 370FEF 371FEF 371NFEF 372FEF 373FEF 430FEF 1270FEF 6600FEF 6620FEF 6621FEF 6630FEF 6631FEF 6650FEF 6660FEF 6662FEF 6664FEF 6700FEF 6701FEF 6710FEF 6711FEF 6764
410ISO 31.120Winding pinion
FEF 165FEF 166
415ISO 31.020Ratchet wheel
FEF 165FEF 166
420ISO 31.023Crown wheel
FEF 165FEF 166
423ISO 81.136Crown wheel core
FEF 165FEF 166
425ISO 51.120Click
FEF 165FEF 166
430ISO 61.080Click spring
FEF 165FEF 166FEF 270FEF 370FEF 371FEF 371NFEF 372FEF 373FEF 400FEF 401FEF 430FEF 1270FEF 6600FEF 6620FEF 6621FEF 6630FEF 6631FEF 6650FEF 6660FEF 6662FEF 6664FEF 6665FEF 6680FEF 6686FEF 6700FEF 6701FEF 6710FEF 6711FEF 6764FEF 6765
435ISO 51.050Yoke
FEF 166
440ISO 61.100Yoke spring
FEF 166
443ISO 51.080Setting lever
FEF 166
443/5443ISO 51.080.06/.01Setting lever
FEF 166
445ISO 51.090Setting lever spring
FEF 166
450ISO 31.100Setting wheel
FEF 165FEF 166FEF 270FEF 370FEF 371FEF 371NFEF 372FEF 373FEF 430FEF 1270FEF 6600FEF 6620FEF 6621FEF 6630FEF 6631FEF 6650FEF 6660FEF 6662FEF 6664FEF 6700FEF 6701FEF 6710FEF 6711FEF 6764
710ISO 40.010Jewelled pallet fork and stat
ETA 2440ETA 2442

Source: original interchangeability lists of FEF (checked transcription) and checked original spare-part labels · as of 2026-10-28. Height / execution: the part fits only in this height or execution.

📄 Technical document

View the original document for FEF 6640 online:

🔗 Movements sharing the most parts

→ All calibers of FEF

❓ Frequently asked questions

Which FEF 6640 spare parts also fit other movements?

For the FEF 6640, 16 part numbers are listed as interchangeable. Together they fit 32 other calibers – the table below shows which part fits which movement.

Which movements share the most parts with the FEF 6640?

The most shared parts: FEF 166 (21 parts), FEF 165 (16 parts), FEF 270 (3 parts).

🛠️ For the workshop

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