Unitas 231 – interchangeable spare parts

Unitas (UT) 231 movement

Which spare parts fit the Unitas 231 movement? For every part you can see which other calibers use the same part according to the original interchangeability list.

21Parts with interchange data

32Calibers sharing parts

Note: We have compiled this overview to the best of our knowledge and belief, based on the original interchangeability lists of Unitas (UT) 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
240ISO 31.080	Cannon-pinion	Unitas 343 Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 445 Unitas 446 Unitas 6431 Unitas 6445 Unitas 6461 Height 295 Unitas 343 Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 445 Unitas 446 Unitas 6431 Unitas 6445 Unitas 6461 Height 310 Unitas 343 Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 445 Unitas 446 Unitas 6431 Unitas 6445 Unitas 6461 Height 345 Unitas 343 Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 445 Unitas 446 Unitas 6431 Unitas 6445 Unitas 6461 Height 360 Unitas 343 Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 445 Unitas 446 Unitas 6431 Unitas 6445 Unitas 6461 Height 405 Unitas 343 Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 445 Unitas 446 Unitas 6431 Unitas 6445 Unitas 6461
250ISO 31.046	Hour wheel	Unitas 343 Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 445 Unitas 446 Unitas 6431 Unitas 6445 Unitas 6461 Height 180 Unitas 343 Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 445 Unitas 446 Unitas 6431 Unitas 6445 Unitas 6461 Height 230 Unitas 343 Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 445 Unitas 446 Unitas 6431 Unitas 6445 Unitas 6461 Height 275 Unitas 343 Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 445 Unitas 446 Unitas 6431 Unitas 6445 Unitas 6461
260ISO 31.041	Minute wheel	Unitas 431 Unitas 432 Unitas 445 Unitas 446 Unitas 6431 Unitas 6445 Unitas 6461
301ISO 40.301	Regulator for flat hairspring	Unitas 429 Unitas 429N
311ISO 70.800	Upper cap jewel with end-piece	Unitas 233 Unitas 234 Unitas 429 Unitas 429N Unitas 431 2e Unitas 432 Unitas 444 Unitas 445 Unitas 446
330ISO 70.801	Lower cap jewel with end-piece	2nd execution Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 444 Unitas 445 Unitas 446 Unitas 498 2nd execution Unitas 233 Unitas 234 Unitas 285 Unitas 286 Unitas 343 Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 444 Unitas 445 Unitas 446 Unitas 497 Unitas 498 Unitas 6500
346ISO 70.807	Lower cap jewel with end-piece, f. esc. wheel	1st execution Unitas 176 Unitas 190 Unitas 200 Unitas 200N Unitas 201 Unitas 201N Unitas 233 Unitas 234 Unitas 285 Unitas 286 Unitas 343 Unitas 429 Unitas 431 Unitas 432 Unitas 510 Unitas 520 Unitas 521 Unitas 630
401ISO 51.010	Winding stem	Unitas 343 Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 445 Unitas 446 Unitas 6431 Unitas 6445 Unitas 6461
407ISO 31.121	Clutch wheel	Unitas 343 Unitas 431 Unitas 432 Unitas 445 Unitas 446 Unitas 6431 Unitas 6445 Unitas 6461
410ISO 31.120	Winding pinion	Unitas 431 Unitas 432 Unitas 445 Unitas 446 Unitas 6431 Unitas 6445 Unitas 6461
415ISO 31.020	Ratchet wheel	Unitas 429 Unitas 429N
420ISO 31.023	Crown wheel	Unitas 429
422ISO 81.067	Crown wheel ring	Unitas 233 Unitas 234 Unitas 285 Unitas 286 Unitas 343 Unitas 429 Unitas 431 Unitas 432 Unitas 444 Unitas 445 Unitas 446 Unitas 497 Unitas 498 Unitas 6431 Unitas 6445 Unitas 6497 Unitas 6498 Unitas 6500 Unitas 6503
425ISO 51.120	Click	Unitas 233 Unitas 234 Unitas 285 Unitas 286 Unitas 343 Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 444 Unitas 445 Unitas 446 Unitas 497 Unitas 498 Unitas 6431 Unitas 6445 Unitas 6497 Unitas 6498 Unitas 6500 Unitas 6503
430ISO 61.080	Click spring	Unitas 233 Unitas 234 Unitas 285 Unitas 286 Unitas 287 Unitas 343 Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 444 Unitas 445 Unitas 446 Unitas 497 Unitas 498 Unitas 6431 Unitas 6445 Unitas 6497 Unitas 6498 Unitas 6500 Unitas 6503
435ISO 51.050	Yoke	Unitas 233 Unitas 234 Unitas 285 Unitas 286 Unitas 343 Unitas 431 Unitas 432 Unitas 444 Unitas 445 Unitas 446 Unitas 497 Unitas 498 Unitas 6431 Unitas 6445 Unitas 6461 Unitas 6497 Unitas 6498 Unitas 6500 Unitas 6503
440ISO 61.100	Yoke spring	Unitas 233 Unitas 234 Unitas 285 Unitas 286 Unitas 343 Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 444 Unitas 445 Unitas 446 Unitas 497 Unitas 498 Unitas 6431 Unitas 6445 Unitas 6461 Unitas 6497 Unitas 6498 Unitas 6500 Unitas 6503
443ISO 51.080	Setting lever	Unitas 431 Unitas 445
445ISO 51.090	Setting lever spring	Unitas 233 Unitas 285 Unitas 287 Unitas 343 Unitas 429 Unitas 429N Unitas 431 Unitas 445 Unitas 497 Unitas 6500
450ISO 31.100	Setting wheel	Unitas 343 Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 445 Unitas 446 Unitas 6431 Unitas 6445 Unitas 6461
453ISO 31.101	Intermediate setting wheel	Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 445 Unitas 446 Unitas 6431 Unitas 6445 Unitas 6461

Source: original interchangeability lists of Unitas (UT) (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 Unitas 231 (height × diameter × thickness × length) and matching mainspring in our shop:

Unitas 231: 2.10 × 16.0 × 0.21 × 480 mm (GR 6106)

🔗 Movements sharing the most parts

→ All calibers of Unitas (UT)

❓ Frequently asked questions

Which Unitas 231 spare parts also fit other movements?

For the Unitas 231, 21 part numbers are listed as interchangeable. Together they fit 32 other calibers – the table below shows which part fits which movement.

Which movements share the most parts with the Unitas 231?

The most shared parts: Unitas 431 (27 parts), Unitas 445 (26 parts), Unitas 429 (25 parts).

Which mainspring fits the Unitas 231?

According to the Générale Ressorts catalogue (height × diameter × thickness × length): 2.10 × 16.0 × 0.21 × 480 mm (GR 6106, hand-wound, normal end hook).