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FE 8121 – interchangeable spare parts
FE (France Ebauches) 8121 movement
Which spare parts fit the FE 8121 movement? For every part you can see which other calibers use the same part according to the original interchangeability list.
41Parts with interchange data
24Calibers sharing parts
Note: We have compiled this overview to the best of our knowledge and belief, based on the original interchangeability lists of FE (France Ebauches) 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 |
|---|---|---|
| 100ISO 10.020.07 | Plate | |
| 110ISO 10.048.07 | Train wheel bridge | |
| 145ISO 10.106 | Rest for flat dial | |
| 203ISO 30.012 | Intermediate wheel and pinion | |
| 210ISO 30.025 | Third wheel | |
| 250-255ISO 31.046 | ||
| 260ISO 31.041 | Minute wheel | |
| 405ISO 51.020 | Handsetting stem, thread diameter S 0,90 mm | |
| 407ISO 31.121 | Clutch wheel | |
| 435ISO 51.050 | Yoke | |
| 440ISO 61.100 | Yoke spring | |
| 443ISO 51.080 | Setting lever | |
| 445ISO 51.090 | Setting lever spring | |
| 453ISO 31.101 | Intermediate setting wheel | |
| 465ISO 10.212 | Handsetting train cover | |
| 929ISO 94.200 | ||
| 2539ISO 53.022 | Date corrector lever | |
| 2556ISO 33.020 | Date indicator driving wheel | |
| 2557/1ISO 91.440 | Date indicator, transferred | |
| 2564ISO 13.144 | Date corrector guard | |
| 2566ISO 53.200 | Date corrector | |
| 2576ISO 53.080 | Date jumper, mounted | |
| 2740ISO 13.100 | Date mechanism maintaining plate | |
| 4000ISO 10.513 | Electronic module | |
| 4022ISO 80.102 | ||
| 4046ISO 20.651 | Battery insulator | |
| 4211ISO 20.580 | Rotor | |
| 4401ISO 20.761 | Bridle + | |
| 4929ISO 20.570 | Battery | |
| 5101ISO 10.020.01 | Case screw | |
| 5102ISO 10.020.02 | Case screw | |
| 5110ISO 10.048.01 | Bridges and balance cock screws | |
| 5443ISO 51.080.01 | Setting lever screw | |
| 5445ISO 51.090.01 | Screw for setting lever spring | |
| 5465ISO 10.212.01 | Screw for handsetting train cover | |
| 5750ISO 90.000.01 | Dial screw | |
| 5929ISO 94.200.01 | ||
| 52740ISO 13.100.01 | Screw for date mechanism maintaining plate | |
| 54000ISO 10.513.01 | Screw for electronic module | |
| 54000/1ISO 10.513.02 | Screw for electronic module | |
| 54401ISO 20.761.01 |
Source: original interchangeability lists of FE (France Ebauches) (checked transcription) and checked original spare-part labels · as of 2026-10-17. Height / execution: the part fits only in this height or execution.