Unitas 520 – interchangeable spare parts

Unitas (UT) 520 movement

Which spare parts fit the Unitas 520 movement? For every part you can see which other calibers use the same part according to the original interchangeability list.

32Parts with interchange data

36Calibers 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.

🛒 Spare parts for Unitas 520 in our shop

Complete Balance Part 721 for UNITAS 6310, 520, 6470, 630 – NOS19,90 € incl. VAT *View item ›

🔧 Interchangeable parts

Part no.	Description	Also fits
182ISO 20.030	Barrel and cover	Unitas 510 Unitas 521
195ISO 20.060	Barrel arbor	Unitas 510 Unitas 521
201ISO 30.015	Center wheel	Unitas 521
210ISO 30.025	Third wheel	Unitas 521
220ISO 30.027	Fourth wheel	Unitas 521
240ISO 31.080	Cannon-pinion	Unitas 510 Unitas 521 Height 190 Unitas 510 Unitas 521 Height 210 Unitas 510 Unitas 521 Height 240 Unitas 510 Unitas 521 Height 270 Unitas 510 Unitas 521 Height 300 Unitas 510 Unitas 521 Height 340 Unitas 510 Unitas 521 Height 420 Unitas 510 Unitas 521 Height 470 Unitas 510 Unitas 521
250ISO 31.046	Hour wheel	Unitas 510 Unitas 521 Height 100 Unitas 510 Unitas 521 Height 120 Unitas 510 Unitas 521 Height 150 Unitas 510 Unitas 521 Height 180 Unitas 510 Unitas 521 Height 210 Unitas 510 Unitas 521 Height 250 Unitas 510 Unitas 521 Height 330 Unitas 510 Unitas 521 Height 380 Unitas 510 Unitas 521
260ISO 31.041	Minute wheel	Unitas 510 Unitas 521
301ISO 40.301	Regulator for flat hairspring	Unitas 510 Unitas 521
311ISO 70.800	Upper cap jewel with end-piece	Unitas 180 Unitas 187 Unitas 199 Unitas 510 Unitas 521 Unitas 560 Unitas 570
330ISO 70.801	Lower cap jewel with end-piece	Unitas 190 Unitas 510 Unitas 521
336ISO 70.806	Upper cap-jewel with end-piece, for escape wheel	1st execution Unitas 521 2nd execution Unitas 180 Unitas 187 Unitas 190 Unitas 200 Unitas 200N Unitas 201 Unitas 201N Unitas 510 Unitas 521 Unitas 630 Unitas 6360 Unitas 6365 Unitas 6470 Unitas 6475 Unitas 6476 Unitas 6480 Unitas 6485 Unitas 6486
346ISO 70.807	Lower cap jewel with end-piece, f. esc. wheel	Unitas 190 Unitas 200 Unitas 200N Unitas 201 Unitas 201N Unitas 510 Unitas 521 Unitas 630 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 343 Unitas 429 Unitas 431 Unitas 432 Unitas 510 Unitas 521 Unitas 630
401ISO 51.010	Winding stem	Unitas 510 Unitas 521
407ISO 31.121	Clutch wheel	Unitas 510 Unitas 521
410ISO 31.120	Winding pinion	Unitas 510 Unitas 521
415ISO 31.020	Ratchet wheel	3rd execution Unitas 510
420ISO 31.023	Crown wheel	3rd execution Unitas 510
422ISO 81.067	Crown wheel ring	Unitas 190 Unitas 510 Unitas 521 Unitas 540 Unitas 550 Unitas 580
423ISO 81.136	Crown wheel core	Unitas 521
425ISO 51.120	Click	Unitas 190 Unitas 510 Unitas 521
430ISO 61.080	Click spring	Unitas 190 Unitas 510 Unitas 521
435ISO 51.050	Yoke	Unitas 510 Unitas 521
440ISO 61.100	Yoke spring	Unitas 510 Unitas 521
443ISO 51.080	Setting lever	2nd execution Unitas 510 Unitas 521
443/5443ISO 51.080.06/.01	Setting lever	2nd execution Unitas 510 Unitas 521
445ISO 51.090	Setting lever spring	2nd execution Unitas 510 Unitas 521
450ISO 31.100	Setting wheel	Unitas 510 Unitas 521
702ISO 30.040.12	Escape wheel and pinion, pivoted, for two end-pieces	Unitas 521
704ISO 30.040.10	Escape wheel and pinion, for upper end-piece	Unitas 521
705ISO 30.040	Escape wheel and pinion	Unitas 521
710ISO 40.010	Jewelled pallet fork and stat	AV 41 Felsa 302 Unitas 510 Unitas 521

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 520 (height × diameter × thickness × length) and matching mainspring in our shop:

Unitas 520 à 524: 1.50 × 7.5 × 0.08 × 260 mm (GR 4077) · 🛒 1

🔗 Movements sharing the most parts

→ All calibers of Unitas (UT)

❓ Frequently asked questions

Which Unitas 520 spare parts also fit other movements?

For the Unitas 520, 32 part numbers are listed as interchangeable. Together they fit 36 other calibers – the table below shows which part fits which movement.

Which movements share the most parts with the Unitas 520?

The most shared parts: Unitas 521 (48 parts), Unitas 510 (42 parts), Unitas 190 (7 parts).

Which mainspring fits the Unitas 520?

According to the Générale Ressorts catalogue (height × diameter × thickness × length): 1.50 × 7.5 × 0.08 × 260 mm (GR 4077, hand-wound, normal end hook).