FEF 40B – interchangeable spare parts

FEF 40B movement

Which spare parts fit the FEF 40B movement? For every part you can see which other calibers use the same part according to the original interchangeability list.

1Parts with interchange data

2Calibers 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.	Description	Also fits
445	Setting lever spring	according to original label FEF 40H according to original label FEF 19-40H

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.

🔗 Movements sharing the most parts

→ All calibers of FEF

❓ Frequently asked questions

Which FEF 40B spare parts also fit other movements?

For the FEF 40B, 1 part numbers are listed as interchangeable. Together they fit 2 other calibers – the table below shows which part fits which movement.