Felsa 4120 – interchangeable spare parts

Felsa 4120 movement

Which spare parts fit the Felsa 4120 movement? For every part you can see which other calibers use the same part according to the original interchangeability list.

31Parts with interchange data

20Calibers sharing parts

Note: We have compiled this overview to the best of our knowledge and belief, based on the original interchangeability lists of Felsa 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
182ISO 20.030	Barrel and cover	Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4024 Felsa 4025 Felsa 4121 Felsa 4122 Felsa 4124 Felsa 4125 Felsa 4130
195ISO 20.060	Barrel arbor	Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4024 Felsa 4025 Felsa 4121 Felsa 4122 Felsa 4124 Felsa 4125 Felsa 4130
201ISO 30.015	Center wheel	Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4121 Felsa 4122 Felsa 4130 Height 371 Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4121 Felsa 4122 Felsa 4130
210ISO 30.025	Third wheel	Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4024 Felsa 4025 Felsa 4121 Felsa 4122 Felsa 4124 Felsa 4125 Felsa 4130
224ISO 30.027.13	Fourth wheel	Felsa 4121 Felsa 4122 Felsa 4130
240ISO 31.080	Cannon-pinion	Height 198 AM 382Felsa 233 Felsa 382 Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4121 Felsa 4122 Felsa 4130 Height 218 AM 382Felsa 233 Felsa 382 Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4121 Felsa 4122 Felsa 4130 Height 238 AM 382Felsa 233 Felsa 382 Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4121 Felsa 4122 Felsa 4130 Height 258 Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4121 Felsa 4122 Height 278 AM 382Felsa 233 Felsa 382 Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4121 Felsa 4122
250ISO 31.046	Hour wheel	Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4121 Felsa 4122 Height 110 Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4121 Felsa 4122 Felsa 4130 Height 130 Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4121 Felsa 4122 Felsa 4130 Height 150 Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4121 Felsa 4122 Felsa 4130 Height 170 Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4121 Felsa 4122 Height 190 Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4121 Felsa 4122
260ISO 31.041	Minute wheel	Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4121 Felsa 4122 Felsa 4130
301ISO 40.301	Regulator for flat hairspring	Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4024 Felsa 4025 Felsa 4121 Felsa 4122 Felsa 4124 Felsa 4125
307ISO 40.301	Regulator with adjustable stud holder, for flat hairspring	Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4024 Felsa 4025 Felsa 4121 Felsa 4122 Felsa 4124 Felsa 4125 Felsa 4130
311ISO 70.800	Upper cap jewel with end-piece	AM 382Felsa 233 Felsa 290 Felsa 291 Felsa 372 Felsa 372N Felsa 373 Felsa 373N Felsa 382 Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4024 Felsa 4025 Felsa 4121 Felsa 4122 Felsa 4124 Felsa 4125
330ISO 70.801	Lower cap jewel with end-piece	Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4121 Felsa 4122
336ISO 70.806	Upper cap-jewel with end-piece, for escape wheel	Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4024 Felsa 4025 Felsa 4121 Felsa 4122 Felsa 4124 Felsa 4125
346ISO 70.807	Lower cap jewel with end-piece, f. esc. wheel	Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4121 Felsa 4122 Felsa 4130
401ISO 51.010	Winding stem	Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4024 Felsa 4025 Felsa 4121 Felsa 4122 Felsa 4124 Felsa 4125 Felsa 4130
407ISO 31.121	Clutch wheel	Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4024 Felsa 4025 Felsa 4121 Felsa 4122 Felsa 4124 Felsa 4125 Felsa 4130
410	Winding pinion	Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4024 Felsa 4025 Felsa 4121 Felsa 4122 Felsa 4124 Felsa 4125 Felsa 4130
415ISO 31.020	Ratchet wheel	Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4024 Felsa 4025 Felsa 4121 Felsa 4122 Felsa 4124 Felsa 4125 Felsa 4130
420ISO 31.023	Crown wheel	Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4024 Felsa 4025 Felsa 4121 Felsa 4122 Felsa 4124 Felsa 4125 Felsa 4130
423ISO 81.136	Crown wheel core	Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4024 Felsa 4025 Felsa 4121 Felsa 4122 Felsa 4124 Felsa 4125
425ISO 51.120	Click	Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4024 Felsa 4025 Felsa 4121 Felsa 4122 Felsa 4124 Felsa 4125 Felsa 4130
430ISO 61.080	Click spring	Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4024 Felsa 4025 Felsa 4121 Felsa 4122 Felsa 4124 Felsa 4125 Felsa 4130
435ISO 51.050	Yoke	AM 382Felsa 233 Felsa 382 Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4025 Felsa 4121 Felsa 4122 Felsa 4125 Felsa 4130
440ISO 61.100	Yoke spring	Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4024 Felsa 4025 Felsa 4121 Felsa 4122 Felsa 4124 Felsa 4125
443ISO 51.080	Setting lever	Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4025 Felsa 4121 Felsa 4122 Felsa 4125
443/5443ISO 51.080.06/.01	Setting lever	Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4025 Felsa 4121 Felsa 4122 Felsa 4125
445ISO 51.090	Setting lever spring	Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4025 Felsa 4121 Felsa 4122 Felsa 4125
450ISO 31.100	Setting wheel	Felsa 4020 Felsa 4021 Felsa 4022 Felsa 4023 Felsa 4024 Felsa 4025 Felsa 4121 Felsa 4122 Felsa 4124 Felsa 4125 Felsa 4130
702ISO 30.040.12	Escape wheel and pinion, pivoted, for two end-pieces	Felsa 4121 Felsa 4122
704ISO 30.040.10	Escape wheel and pinion, for upper end-piece	Felsa 4121 Felsa 4122 Felsa 4124 Felsa 4125
705ISO 30.040	Escape wheel and pinion	Felsa 4121 Felsa 4122 Felsa 4124 Felsa 4125

Source: original interchangeability lists of Felsa (checked transcription) and checked original spare-part labels · as of 2026-10-17. Height / execution: the part fits only in this height or execution.