INT.S 551 – interchangeable spare parts

INT.S 551 movement

Which spare parts fit the INT.S 551 movement? For every part you can see which other calibers use the same part according to the original interchangeability list.

22Parts with interchange data

8Calibers sharing parts

Note: We have compiled this overview to the best of our knowledge and belief, based on the original interchangeability lists of INT.S 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	INT.S 55 INT.S 552
195ISO 20.060	Barrel arbor	INT.S 55 INT.S 552
201ISO 30.015	Center wheel	INT.S 55 INT.S 552
210ISO 30.025	Third wheel	INT.S 55 INT.S 552
260ISO 31.041	Minute wheel	INT.S 55 INT.S 552
301ISO 40.301	Regulator for flat hairspring	INT.S 55 INT.S 552
307ISO 40.301	Regulator with adjustable stud holder, for flat hairspring	INT.S 55 INT.S 552
336ISO 70.806	Upper cap-jewel with end-piece, for escape wheel	INT.S 52 INT.S 55 INT.S 552
401ISO 51.010	Winding stem	INT.S 55 INT.S 552
407ISO 31.121	Clutch wheel	INT.S 55 INT.S 552
410ISO 31.120	Winding pinion	INT.S 55 INT.S 552
415ISO 31.020	Ratchet wheel	INT.S 55 INT.S 552
420ISO 31.023	Crown wheel	INT.S 55 INT.S 552
422ISO 81.067	Crown wheel ring	INT.S 55 INT.S 552
425ISO 51.120	Click	INT.S 55 INT.S 552
430ISO 61.080	Click spring	INT.S 41 INT.S 46 INT.S 50 INT.S 52 INT.S 53 INT.S 55 INT.S 501 INT.S 552
435ISO 51.050	Yoke	INT.S 55 INT.S 552
440ISO 61.100	Yoke spring	INT.S 55 INT.S 552
443ISO 51.080	Setting lever	INT.S 55 INT.S 552
443/5443ISO 51.080.06/.01	Setting lever	INT.S 55 INT.S 552
445ISO 51.090	Setting lever spring	INT.S 55 INT.S 552
450ISO 31.100	Setting wheel	INT.S 55 INT.S 552

Source: original interchangeability lists of INT.S (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 INT.S 551 (height × diameter × thickness × length) and matching mainspring in our shop:

INT.S 551: 1.25 × 8.5 × 0.10 × 280 mm (GR 3109)

🔗 Movements sharing the most parts

→ All calibers of INT.S

❓ Frequently asked questions

Which INT.S 551 spare parts also fit other movements?

For the INT.S 551, 22 part numbers are listed as interchangeable. Together they fit 8 other calibers – the table below shows which part fits which movement.

Which movements share the most parts with the INT.S 551?

The most shared parts: INT.S 55 (22 parts), INT.S 552 (22 parts), INT.S 52 (2 parts).

Which mainspring fits the INT.S 551?

According to the Générale Ressorts catalogue (height × diameter × thickness × length): 1.25 × 8.5 × 0.10 × 280 mm (GR 3109, hand-wound, normal end hook).