FHF 66 – interchangeable spare parts

FHF 66 movement

Which spare parts fit the FHF 66 movement? For every part you can see which other calibers use the same part according to the original interchangeability list.

33Parts with interchange data

97Calibers sharing parts

Note: We have compiled this overview to the best of our knowledge and belief, based on the original interchangeability lists of FHF 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	FHF 66-4 FHF 66-4N FHF 66-9 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9
195ISO 20.060	Barrel arbor	FHF 66-4 FHF 66-4N FHF 66-9 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9
206ISO 30.015	Center wheel	FHF 66-4 FHF 66-4N FHF 66-9 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9
210ISO 30.025	Third wheel	FHF 66-4 FHF 66-4N FHF 66-9 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9
227ISO 30.027	Sweep second wheel	FHF 665 Height 435 FHF 665 Height 460 FHF 66-4 FHF 66-4N FHF 66-9 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9 Height 485 FHF 66-4 FHF 66-4N FHF 66-9 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9 Height 510 FHF 66-4 FHF 66-4N FHF 66-9 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9
245ISO 31.080	Cannon pinion with clam notch	FHF 65 FHF 665 Height 130 FHF 65 FHF 665 Height 155 FHF 65 FHF 65-4 FHF 66-4 FHF 66-4N FHF 66-9 FHF 90-4 FHF 90-5 FHF 90-9 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9 FHF 905 Height 180 FHF 65 FHF 65-4 FHF 66-4 FHF 66-4N FHF 66-9 FHF 90-4 FHF 90-5 FHF 90-9 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9 FHF 905 Height 205 FHF 65 FHF 65-4 FHF 66-4 FHF 66-4N FHF 66-9 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9
255ISO 31.046	Hour wheel	FHF 65 FHF 665 Height 80 FHF 65 FHF 665 Height 105 FHF 65 FHF 65-4 FHF 66-4 FHF 66-4N FHF 66-9 FHF 90-4 FHF 90-5 FHF 90-9 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9 FHF 905 Height 130 FHF 65 FHF 65-4 FHF 66-4 FHF 66-4N FHF 66-9 FHF 90-4 FHF 90-5 FHF 90-9 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9 FHF 905 Height 155 FHF 65 FHF 65-4 FHF 66-4 FHF 66-4N FHF 66-9 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9
260ISO 31.041	Minute wheel	FHF 65 FHF 65-4 FHF 66-4 FHF 66-4N FHF 66-9 FHF 90-9 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9
307ISO 40.301	Regulator with adjustable stud holder, for flat hairspring	FHF 66-4 FHF 66-4N FHF 66-9 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9
311ISO 70.800	Upper cap jewel with end-piece	FHF 55 FHF 55-2 FHF 55-4 FHF 66-4 FHF 66-4N FHF 66-9 FHF 67 FHF 67-2 FHF 67-2N FHF 67-4 FHF 70 FHF 70-1 FHF 70-2 FHF 70-2N FHF 71 FHF 71-2 FHF 71-2N FHF 72 FHF 72-2 FHF 72-2N FHF 72-4 FHF 72-4N FHF 72-6 FHF 72-7 FHF 72-9 FHF 73 FHF 73-2 FHF 73-2N FHF 73-4 FHF 73-4N FHF 74 FHF 74-2 FHF 74-4 FHF 74-4N FHF 76 FHF 76-2 FHF 551 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9 FHF 671 FHF 671-2 FHF 671-2N FHF 675 FHF 675-4 FHF 676 FHF 676-4 FHF 701 FHF 701-2 FHF 701-2N FHF 711 FHF 711-2 FHF 711-2N FHF 725 FHF 725-4 FHF 725-4N FHF 725-7 FHF 725-9 FHF 729 FHF 729-4N FHF 729-7 FHF 735 FHF 735-4 FHF 735-4N FHF 739 FHF 739-4N FHF 745 FHF 745-4 FHF 745-4N FHF 761 FHF 761-2
330ISO 70.801	Lower cap jewel with end-piece	FHF 66-4 FHF 66-4N FHF 66-9 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9
336ISO 70.806	Upper cap-jewel with end-piece, for escape wheel	FHF 66-4 FHF 66-4N FHF 66-9 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9
342ISO 70.881	Bearing plate, jewelled, for sweep second wheel	FHF 66-4 FHF 66-4N FHF 66-9 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9
343ISO 70.891	Bearing plate, for sweep second wheel	FHF 66-4 FHF 66-4N FHF 66-9 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9
346ISO 70.807	Lower cap jewel with end-piece, f. esc. wheel	FHF 66-4 FHF 66-4N FHF 665 FHF 665-4 FHF 665-4N
401ISO 51.010	Winding stem	FHF 66-4 FHF 66-4N FHF 66-9 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9
407ISO 31.121	Clutch wheel	FHF 66-4 FHF 66-4N FHF 66-9 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9
410ISO 31.120	Winding pinion	FHF 66-4 FHF 66-4N FHF 66-9 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9
415ISO 31.020	Ratchet wheel	FHF 66-4 FHF 66-4N FHF 66-9 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9
420ISO 31.023	Crown wheel	FHF 66-4 FHF 66-4N FHF 66-9 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9
423ISO 81.136	Crown wheel core	FHF 66-4 FHF 66-4N FHF 66-9 FHF 76 FHF 76-2 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9 FHF 761 FHF 761-2
425ISO 51.120	Click	FHF 55 2e FHF 55-2 FHF 55-4 FHF 66-4 FHF 66-4N FHF 66-9 FHF 67 FHF 67-2 FHF 67-2N FHF 67-4 FHF 72 FHF 72-2 FHF 72-2N FHF 72-4 FHF 72-4N FHF 72-6 FHF 72-7 FHF 72-9 FHF 73 FHF 73-2 FHF 73-2N FHF 73-4 FHF 73-4N FHF 81 FHF 81-2 FHF 82 FHF 82-4 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9 FHF 671 FHF 671-2 FHF 671-2N FHF 675 FHF 675-4 FHF 676 FHF 676-4 FHF 725 FHF 725-4 FHF 725-4N FHF 725-7 FHF 725-9 FHF 729 FHF 729-4N FHF 729-7 FHF 735 FHF 735-4 FHF 735-4N FHF 739 FHF 739-4N FHF 811 FHF 811-2 FHF 821 FHF 821-4 ST 96 2e
430ISO 61.080	Click spring	FHF 28 FHF 28-2 FHF 28-2N FHF 55 FHF 55-2 FHF 55-4 FHF 66-4 FHF 66-4N FHF 66-9 FHF 67 FHF 67-2 FHF 67-2N FHF 67-4 FHF 70 FHF 70-1 FHF 70-2 FHF 70-2N FHF 71 FHF 71-2 FHF 71-2N FHF 72 FHF 72-2 FHF 72-2N FHF 72-4 FHF 72-4N FHF 72-6 FHF 72-7 FHF 72-9 FHF 73 FHF 73-2 FHF 73-2N FHF 73-4 FHF 73-4N FHF 74 FHF 74-2 FHF 74-4 FHF 74-4N FHF 76 FHF 76-2 FHF 81 FHF 81-2 FHF 82 FHF 82-4 FHF 281 FHF 281-2 FHF 281-2N FHF 551 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9 FHF 671 FHF 671-2 FHF 671-2N FHF 675 FHF 675-4 FHF 676 FHF 676-4 FHF 701 FHF 701-2 FHF 701-2N FHF 711 FHF 711-2 FHF 711-2N FHF 725 FHF 725-4 FHF 725-4N FHF 725-7 FHF 725-9 FHF 729 FHF 729-4N FHF 729-7 FHF 735 FHF 735-4 FHF 735-4N FHF 739 FHF 739-4N FHF 741 FHF 745 FHF 745-4 FHF 745-4N FHF 761 FHF 761-2 FHF 811 FHF 811-2 FHF 821 FHF 821-4 ST 96
435ISO 51.050	Yoke	FHF 55 FHF 55-2 FHF 55-4 FHF 65 FHF 65-4 FHF 66-4 FHF 66-4N FHF 66-9 FHF 72 FHF 72-2 FHF 72-2N FHF 72-4 FHF 72-4N FHF 72-6 FHF 72-9 FHF 551 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9 FHF 725 FHF 725-4 FHF 725-4N FHF 725-9 FHF 729 FHF 729-4N
440ISO 61.100	Yoke spring	FHF 55 FHF 55-2 FHF 55-4 FHF 66-4 FHF 66-4N FHF 66-9 FHF 67 FHF 67-2 FHF 67-2N FHF 67-4 FHF 72 FHF 72-2 FHF 72-2N FHF 72-4 FHF 72-4N FHF 72-6 FHF 72-7 FHF 72-9 FHF 73 FHF 73-2 FHF 73-2N FHF 73-4 FHF 73-4N FHF 74 FHF 74-2 FHF 74-4 FHF 74-4N FHF 98 FHF 98-1 FHF 551 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9 FHF 671 FHF 671-2 FHF 671-2N FHF 675 FHF 675-4 FHF 676 FHF 676-4 FHF 725 FHF 725-4 FHF 725-4N FHF 725-7 FHF 725-9 FHF 729 FHF 729-4N FHF 729-7 FHF 735 FHF 735-4 FHF 735-4N FHF 739 FHF 739-4N FHF 741 FHF 745 FHF 745-4 FHF 745-4N FHF 984 ST 96
443ISO 51.080	Setting lever	FHF 65 FHF 65-4 FHF 66-4 FHF 66-4N FHF 66-9 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9
443/5443ISO 51.080.06/01	Setting lever	FHF 65 FHF 65-4 FHF 66-4 FHF 66-4N FHF 66-9
445ISO 51.090	Setting lever spring	FHF 55 FHF 55-2 FHF 55-4 FHF 65 FHF 65-4 FHF 66-4 FHF 66-4N FHF 66-9 FHF 67 FHF 67-2 FHF 67-2N FHF 67-4 FHF 72 FHF 72-2 FHF 72-2N FHF 72-4 FHF 72-4N FHF 72-6 FHF 72-7 FHF 72-9 FHF 73 FHF 73-2 FHF 73-2N FHF 73-4 FHF 73-4N FHF 74 FHF 74-2 FHF 74-4 FHF 74-4N FHF 551 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9 FHF 671 FHF 671-2 FHF 671-2N FHF 675 FHF 675-4 FHF 676 FHF 676-4 FHF 725 FHF 725-4 FHF 725-4N FHF 725-7 FHF 725-9 FHF 729 FHF 729-4N FHF 729-7 FHF 735 FHF 735-4 FHF 735-4N FHF 739 FHF 739-4N FHF 741 FHF 745 FHF 745-4 FHF 745-4N
450ISO 31.100	Setting wheel	FHF 65 FHF 65-4 FHF 66-4 FHF 66-4N FHF 66-9 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9
462ISO 10.062	Minute work cock	FHF 55 FHF 55-2 FHF 55-4 FHF 65 FHF 65-4 FHF 66-4 FHF 66-4N FHF 72 FHF 72-2 FHF 72-2N FHF 72-4 FHF 72-4N FHF 72-6 FHF 72-7 FHF 551 FHF 665 FHF 665-4 FHF 665-4N FHF 725 FHF 725-4 FHF 725-4N FHF 725-7 FHF 729 FHF 729-4N FHF 729-7
702ISO 30.040.12	Escape wheel and pinion, pivoted, for two end-pieces	FHF 66-4 FHF 66-4N FHF 66-9 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9
703ISO 30.040.11	Escape wheel and pinion, for lower end-piece	FHF 66-4 FHF 66-4N FHF 66-9 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9
710ISO 40.010	Jewelled pallet fork and stat	FHF 81 FHF 81-2 FHF 82 FHF 82-4 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9 FHF 811 FHF 811-2 FHF 821 FHF 821-4 1st execution FHF 66-4 FHF 66-4N FHF 66-9 FHF 81 FHF 81-2 FHF 82 FHF 82-4 FHF 665 FHF 665-4 FHF 665-4N FHF 665-9 FHF 811 FHF 811-2 FHF 821 FHF 821-4

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

🌀 Matching mainspring

Mainspring dimensions for FHF 66 (height × diameter × thickness × length) and matching mainspring in our shop:

FHF 66: 1.0 × 10.0 × 0.125 × 320 mm (GR 2473)

📄 Technical document

View the original document for FHF 66 online:

FHF 66 – Ø 25.60 mm

🔗 Movements sharing the most parts

→ All calibers of FHF

❓ Frequently asked questions

Which FHF 66 spare parts also fit other movements?

For the FHF 66, 33 part numbers are listed as interchangeable. Together they fit 97 other calibers – the table below shows which part fits which movement.

Which movements share the most parts with the FHF 66?

The most shared parts: FHF 665 (45 parts), FHF 66-4 (39 parts), FHF 66-4N (39 parts).

Which mainspring fits the FHF 66?

According to the Générale Ressorts catalogue (height × diameter × thickness × length): 1.0 × 10.0 × 0.125 × 320 mm (GR 2473, hand-wound, normal end hook).