Unitas 343 – interchangeable spare parts

Unitas (UT) 343 movement

Which spare parts fit the Unitas 343 movement? For every part you can see which other calibers use the same part according to the original interchangeability list.

15Parts with interchange data

43Calibers 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 231 Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 445 Unitas 446 Unitas 6431 Unitas 6445 Unitas 6461 Height 295 Unitas 231 Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 445 Unitas 446 Unitas 6431 Unitas 6445 Unitas 6461 Height 310 Unitas 231 Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 445 Unitas 446 Unitas 6431 Unitas 6445 Unitas 6461 Height 345 Unitas 231 Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 445 Unitas 446 Unitas 6431 Unitas 6445 Unitas 6461 Height 360 Unitas 231 Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 445 Unitas 446 Unitas 6431 Unitas 6445 Unitas 6461 Height 405 Unitas 231 Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 445 Unitas 446 Unitas 6431 Unitas 6445 Unitas 6461
250ISO 31.046	Hour wheel	Unitas 231 Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 445 Unitas 446 Unitas 6431 Unitas 6445 Unitas 6461 Height 180 Unitas 231 Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 445 Unitas 446 Unitas 6431 Unitas 6445 Unitas 6461 Height 230 Unitas 231 Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 445 Unitas 446 Unitas 6431 Unitas 6445 Unitas 6461 Height 275 Unitas 231 Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 445 Unitas 446 Unitas 6431 Unitas 6445 Unitas 6461
330ISO 70.801	Lower cap jewel with end-piece	1st execution Unitas 180 Unitas 187 Unitas 199 Unitas 285 Unitas 286 Unitas 497 Unitas 6500 2nd execution Unitas 231 2e Unitas 233 Unitas 234 Unitas 285 Unitas 286 Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 444 Unitas 445 Unitas 446 Unitas 497 Unitas 498 Unitas 6500
336ISO 70.806	Upper cap-jewel with end-piece, for escape wheel	2nd execution Unitas 497
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 231 Unitas 233 Unitas 234 Unitas 285 Unitas 286 Unitas 429 Unitas 431 Unitas 432 Unitas 510 Unitas 520 Unitas 521 Unitas 630 2nd execution Unitas 176 Unitas 233 Unitas 234 Unitas 285 Unitas 286 Unitas 376 Unitas 444 Unitas 497 Unitas 498 Unitas 560 Unitas 570 Unitas 580 Unitas 600 Unitas 620 Unitas 640 Unitas 650 Unitas 6500
401ISO 51.010	Winding stem	Unitas 231 Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 445 Unitas 446 Unitas 6431 Unitas 6445 Unitas 6461
407ISO 31.121	Clutch wheel	Unitas 231 Unitas 431 Unitas 432 Unitas 445 Unitas 446 Unitas 6431 Unitas 6445 Unitas 6461
422ISO 81.067	Crown wheel ring	Unitas 231 Unitas 233 Unitas 234 Unitas 285 Unitas 286 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 231 Unitas 233 Unitas 234 Unitas 285 Unitas 286 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 231 Unitas 233 Unitas 234 Unitas 285 Unitas 286 Unitas 287 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 231 Unitas 233 Unitas 234 Unitas 285 Unitas 286 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 231 Unitas 233 Unitas 234 Unitas 285 Unitas 286 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
445ISO 51.090	Setting lever spring	Unitas 231 Unitas 233 Unitas 285 Unitas 287 Unitas 429 Unitas 429N Unitas 431 Unitas 445 Unitas 497 Unitas 6500
446ISO 51.090	Setting lever spring for negative hand-setting	Unitas 429 Unitas 429N
450ISO 31.100	Setting wheel	Unitas 231 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 343 (height × diameter × thickness × length) and matching mainspring in our shop:

Unitas 343: 2.20 × 14.0 × 0.18 × 400 mm (GR 6245)

🔗 Movements sharing the most parts

→ All calibers of Unitas (UT)

❓ Frequently asked questions

Which Unitas 343 spare parts also fit other movements?

For the Unitas 343, 15 part numbers are listed as interchangeable. Together they fit 43 other calibers – the table below shows which part fits which movement.

Which movements share the most parts with the Unitas 343?

The most shared parts: Unitas 231 (21 parts), Unitas 431 (21 parts), Unitas 429 (20 parts).

Which mainspring fits the Unitas 343?

According to the Générale Ressorts catalogue (height × diameter × thickness × length): 2.20 × 14.0 × 0.18 × 400 mm (GR 6245, hand-wound, normal end hook).