FEF 166 – interchangeable spare parts

FEF 166 movement

Which spare parts fit the FEF 166 movement? For every part you can see which other calibers use the same part according to the original interchangeability list.

26Parts with interchange data

30Calibers 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
182ISO 20.030	Barrel and cover	FEF 165 FEF 6640
195ISO 20.060	Barrel arbor	FEF 165
201ISO 30.015	Center wheel	FEF 165
210ISO 30.025	Third wheel	FEF 165
220ISO 30.027	Fourth wheel	FEF 165
240ISO 31.080	Cannon-pinion	FEF 165 FEF 6640 Height 175 FEF 165 FEF 6640 Height 200 FEF 165 FEF 6640 Height 225 FEF 165 FEF 6640 Height 250 FEF 165 FEF 6640 Height 275 FEF 165 FEF 6640 Height 300 FEF 165 FEF 6640
250ISO 31.046	Hour wheel	FEF 165 Height 85 FEF 165 Height 110 FEF 165 Height 135 FEF 165 Height 160 FEF 165 Height 185 FEF 165 Height 210 FEF 165
260ISO 31.041	Minute wheel	FEF 165
301ISO 40.301	Regulator for flat hairspring	1st execution FEF 165
316ISO 70.800.18	Upper cap jewel with special end-piece, for balance	FEF 165
330ISO 70.801	Lower cap jewel with end-piece	FEF 165 1st execution FEF 165 FEF 270 FEF 1270
407ISO 31.121	Clutch wheel	FEF 165 FEF 270 FEF 370 FEF 371 FEF 371N FEF 372 FEF 373 FEF 430 FEF 1270 FEF 6600 FEF 6620 FEF 6621 FEF 6630 FEF 6631 FEF 6640 FEF 6650 FEF 6660 FEF 6662 FEF 6664 FEF 6700 FEF 6701 FEF 6710 FEF 6711 FEF 6764
410ISO 31.120	Winding pinion	FEF 165 FEF 6640
415ISO 31.020	Ratchet wheel	FEF 165 FEF 6640
420ISO 31.023	Crown wheel	FEF 165 FEF 6640
423ISO 81.136	Crown wheel core	FEF 165 FEF 6640
425ISO 51.120	Click	FEF 165 FEF 6640
430ISO 61.080	Click spring	FEF 165 FEF 270 FEF 370 FEF 371 FEF 371N FEF 372 FEF 373 FEF 400 FEF 401 FEF 430 FEF 1270 FEF 6600 FEF 6620 FEF 6621 FEF 6630 FEF 6631 FEF 6640 FEF 6650 FEF 6660 FEF 6662 FEF 6664 FEF 6665 FEF 6680 FEF 6686 FEF 6700 FEF 6701 FEF 6710 FEF 6711 FEF 6764 FEF 6765
435ISO 51.050	Yoke	FEF 6640
440ISO 61.100	Yoke spring	FEF 6640
443ISO 51.080	Setting lever	FEF 6640
443/5443ISO 51.080.06/.01	Setting lever	FEF 6640
445ISO 51.090	Setting lever spring	FEF 6640
450ISO 31.100	Setting wheel	FEF 165 FEF 270 FEF 370 FEF 371 FEF 371N FEF 372 FEF 373 FEF 430 FEF 1270 FEF 6600 FEF 6620 FEF 6621 FEF 6630 FEF 6631 FEF 6640 FEF 6650 FEF 6660 FEF 6662 FEF 6664 FEF 6700 FEF 6701 FEF 6710 FEF 6711 FEF 6764
705ISO 30.040	Escape wheel and pinion	FEF 165
710ISO 40.010	Jewelled pallet fork and stat	1st execution FEF 165

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 166 online:

FEF 166

🔗 Movements sharing the most parts

→ All calibers of FEF

❓ Frequently asked questions

Which FEF 166 spare parts also fit other movements?

For the FEF 166, 26 part numbers are listed as interchangeable. Together they fit 30 other calibers – the table below shows which part fits which movement.