ST 1801 – interchangeable spare parts

ST 1801 movement

Which spare parts fit the ST 1801 movement? For every part you can see which other calibers use the same part according to the original interchangeability list.

36Parts with interchange data

59Calibers sharing parts

Note: We have compiled this overview to the best of our knowledge and belief, based on the original interchangeability lists of ST 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
163/1ISO 80.400	Center pipe	ST 1800 ST 1802 ST 1803 ST 1940 ST 1941 ST 1950 ST 1951
182ISO 20.030	Barrel and cover	ST 1800 ST 1802 ST 1803 ST 1940 ST 1941 ST 1950 ST 1951
195ISO 20.060	Barrel arbor	ST 1800 ST 1802 ST 1803 ST 1940 ST 1941 ST 1950 ST 1951
201/1ISO 30.014	Large driving wheel	ST 1800 ST 1802 ST 1803 ST 1940 ST 1941 ST 1950 ST 1951
210ISO 30.025	Third wheel	ST 1800 ST 1802 ST 1803 ST 1940 ST 1941 ST 1950 ST 1951
227ISO 30.027	Sweep second wheel	ST 1800 ST 1802 ST 1803 Height 608 ST 1800 ST 1802 ST 1803
240ISO 31.080	Cannon-pinion	ST 1800 ST 1802 ST 1803 ST 1940 ST 1941 ST 1950 ST 1951
243ISO 31.081	Cannon pinion without clam notch	ST 1800 ST 1802 ST 1803 ST 1940 ST 1941 ST 1950 ST 1951 Height 250 AS 1710 ST 1800 ST 1802 ST 1803 ST 1940 ST 1941 ST 1950 ST 1951 Height 275 AS 1710 ST 1800 ST 1802 ST 1803 ST 1940 ST 1941 ST 1950 ST 1951
255ISO 31.046	Hour wheel	ST 1803 ST 1941 ST 1951 Height 151 ST 1803 ST 1941 ST 1951 Height 176 ST 1803 ST 1941 ST 1951
260ISO 31.041	Minute wheel	AS 2060 ST 1800 ST 1802 ST 1803 ST 1940 ST 1941 ST 1950 ST 1951
307ISO 40.301	Regulator with adjustable stud holder, for flat hairspring	AS 984 ST 1686 ST 1786 ST 1800 ST 1802 ST 1803
311ISO 70.800	Upper cap jewel with end-piece	ST 1800 ST 1802 ST 1803 ST 1940 ST 1941 ST 1950 ST 1951
330ISO 70.801	Lower cap jewel with end-piece	ST 1800 ST 1802 ST 1803 ST 1940 ST 1941 ST 1950 ST 1951
401ISO 51.010	Winding stem	ST 1800 ST 1802 ST 1803 ST 1940 ST 1941 ST 1950 ST 1951
407ISO 31.121	Clutch wheel	ST 1051 ST 1800 ST 1802 ST 1803 ST 1940 ST 1941 ST 1950 according to original label ST 1800 ST 1802 ST 1803 ST 1940 ST 1941 ST 1950 ST 1951
410ISO 31.120	Winding pinion	ST 1800 ST 1802 ST 1803 ST 1940 ST 1941 ST 1950 ST 1951
415ISO 31.020	Ratchet wheel	ST 1800 ST 1802 ST 1803 ST 1940 ST 1941 ST 1950 ST 1951
420ISO 31.023	Crown wheel	ST 1800 ST 1802 ST 1803 ST 1940 ST 1941 ST 1950 ST 1951
422ISO 81.067	Crown wheel ring	AS 964 ST 1800 ST 1802 ST 1803 ST 1940 ST 1941 ST 1950 ST 1951
425ISO 51.120	Click	ST 1800 ST 1802 ST 1803 ST 1940 ST 1941 ST 1950 ST 1951
430ISO 61.080	Click spring	ST 1800 ST 1802 ST 1803 ST 1940 ST 1941 ST 1950 ST 1951
435ISO 51.050	Yoke	ST 1800 ST 1802 ST 1803 ST 1940 ST 1941 ST 1950 ST 1951
440ISO 61.100	Yoke spring	AS 984 ST 1686 ST 1786 ST 1800 ST 1802 ST 1803 ST 1940 ST 1941 ST 1950 ST 1951
443ISO 51.080	Setting lever	ST 1800 ST 1802 ST 1803 ST 1940 ST 1941 ST 1950 ST 1951
443/5443ISO 51.080.06/.01	Setting lever	ST 1800 ST 1802 ST 1803 ST 1940 ST 1941 ST 1950 ST 1951
445ISO 51.090	Setting lever spring	ST 1800 ST 1802 ST 1803 ST 1940 ST 1941 ST 1950 ST 1951
450ISO 31.100	Setting wheel	ST 1800 ST 1802 ST 1803 ST 1940 ST 1941 ST 1950 ST 1951
468ISO 51.202	Cannon pinion guard	ST 1800 ST 1802 ST 1803 ST 1940 ST 1941 ST 1950 ST 1951
705ISO 30.040	Escape wheel and pinion	ST 1800 ST 1802 ST 1803
710ISO 40.010	Jewelled pallet fork and stat	ST 1800 ST 1802 ST 1803 ST 1940 ST 1941 ST 1950 ST 1951
2535ISO 13.105	Date indicator guard	ST 1803 ST 1941 ST 1951
2543ISO 33.011	Intermediate date wheel	ST 1803 ST 1941 ST 1951
2556ISO 33.020	Date indicator driving wheel	ST 1803 ST 1941 ST 1951
2557/1ISO 91.440	Date indicator, transferred	ST 1941
2575ISO 63.030	Date jumper spring	ST 1803 ST 1941 ST 1951
2576ISO 53.080	Date jumper, mounted	AS 1711 AS 1713 AS 1715 AS 1717 AS 1747 AS 1749 AS 1799 AS 1814 AS 1816 AS 1820 AS 1824 AS 1825 AS 1826 AS 1827 AS 1831 AS 1838 AS 1839 AS 1861 AS 1863 AS 1866 AS 1871 AS 1873 AS 1876 AS 1881 AS 1883 AS 1885 AS 1886 AS 1893 AS 1895 AS 1896 AS 1901 AS 1903 AS 1904 AS 1911 AS 1913 AS 1914 AS 1916 AS 1920 AS 1981 AS 1983 AS 1985 AS 1986 AS 1993 AS 1995 AS 1996 AS 1711 ST 1803 ST 1941 ST 1951

Source: original interchangeability lists of ST (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 ST 1801 (height × diameter × thickness × length) and matching mainspring in our shop:

ST 1800 à 1803: 1.70 × 9.0 × 0.10 × 300 mm (GR 4879)

🔗 Movements sharing the most parts

→ All calibers of ST

❓ Frequently asked questions

Which ST 1801 spare parts also fit other movements?

For the ST 1801, 36 part numbers are listed as interchangeable. Together they fit 59 other calibers – the table below shows which part fits which movement.

Which movements share the most parts with the ST 1801?

The most shared parts: ST 1803 (41 parts), ST 1941 (38 parts), ST 1951 (36 parts).

Which mainspring fits the ST 1801?

According to the Générale Ressorts catalogue (height × diameter × thickness × length): 1.70 × 9.0 × 0.10 × 300 mm (GR 4879, hand-wound, normal end hook).