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Mainspring
For Unitas 521
1.30 x 0.080 x 245 x 7.5 mm
Height (H): 1.3mm
Thickness (T): 0.08mm
Total Length (TL): 245mm
Barrel Diameter (BD): 7.5mm
End Type: Manual
To look for similar mainsprings that exactly match a specific dimension, select it from the links above.
GR Approximation
This mainspring does not have a GR reference. The following GR mainsprings are the closest fit, when values differ the exact value is shown brackets for reference:
Movement Listing
This mainspring is used by the following movements:
| Movement | Description | Ligne |
|---|---|---|
| A. Schild 1250 | AUTOMATIC-DIRECT CENTER SECOND | 11 |
| Bulova B740 | BULOVA CASE REFERENCE | |
| Bulova C870013 | BULOVA CASE REFERENCE | |
| Citizen 4-664647 | CITIZEN CASE | |
| Buren 300 | FOR SWEEP SECOND USE BUREN 301 | 8.75 |
| Citizen 4-224299 | CITIZEN CASE | |
| Citizen 36-0528 | CITIZE CASE REFERENCE | |
| Citizen 4-224299 | CITIZEN CASE | |
| Citizen 4-289285 | CITIZEN CASE | |
| Seiko 8223-5330 | SEIKO CASE REFERENCE | |
| Citizen 4-292367 | CITIZEN CASE | |
| Citizen 4-296168 | CITIZEN CASE | |
| Citizen 4-327411 | CITIZEN CASE | |
| Citizen 4-392850 | CITIZEN CASE | |
| Wittnauer 8VIS | 8.75 | |
| Citizen 4-664647 | CITIZEN CASE | |
| Citizen 4-700546 | CITIZEN CASE | |
| Citizen 4-870255 | CITIZEN CASE | |
| Seiko 6M23-7004 | ANALOG QUARTZ | |
| Citizen 4-A00492 | CITIZEN CASE | |
| Citizen 4-G07630 | CITIZEN CASE | |
| Citizen 4-H07545 | CITIZEN CASE | |
| Citizen 4-K06240 | CITIZEN CASE | |
| Citizen 4-R00634 | CITIZEN CASE | |
| Citizen 4-327411 | CITIZEN CASE | |
| Citizen 4-S56182 | CITIZEN CASE | |
| Citizen 4-392850 | CITIZEN CASE | |
| Citizen 4-Y54322 | CITIZE CASE REFERENCE | |
| Citizen 49-6090 | CITIZE CASE REFERENCE | |
| Citizen 4-392850 | CITIZEN CASE | |
| Citizen 7820A | ||
| Citizen QA7174 | CITIZE CASE REFERENCE | |
| Cyma Tavannes 481 | AUT SMALL SECOND | 12.5 |
| Elgin 324 | ||
| Felsa 400 | DIRECT CENTER SECOND | 11.5 |
| Heuer 665.013 | HEUER | |
| Movado 369 | CAL-DSS | 11.25 |
| Omega 551.0069 | OMEGA CASE REFERENCE | |
| Phenix 180 | DIRECT CENTER SECOND | 10.5 |
| Rado 1848 | AS 1713 | |
| Rado 1848 | AS 1713 | |
| Rolex 16523 | ROLEX CASE REFERENCE | |
| Seiko 2P20-5B80 | SEIKO CASE REFERENCE | |
| Seiko 3Y02-0011 | SEIKO CASE REFERENCE | |
| Seiko 4100-5029 | SEIKO CASE REFERENCE | |
| Seiko 4206-5510 | SEIKO CASE REFERENCE | |
| Seiko 4N20-5082 | SEIKO CASE REFERENCE COSERVE 2003/2004 | |
| Seiko 5606-7196 | SEIKO | |
| Seiko 5Y39-7149 | SEIKO CASE REFERENCE | |
| Seiko 6106-7490 | SEIKO CASE REFERENCE | |
| Seiko 6430-534A | SEIKO CASE REFERENCE | |
| Seiko 6M23-7004 | ANALOG QUARTZ | |
| Seiko 8223-5330 | SEIKO CASE REFERENCE | |
| Seiko 9020-5249 | SEIKO CASE REFERENCE | |
| Seiko V401-5510 | SEKIO CASE | |
| Seiko V515-8A20 | SEIKO CASE 08/12/98 | |
| Seiko Y150-5J60 | SEIKO CASE REFERENCE COSERVE 2003/2004 | |
| Wittnauer 11P | REG & SS | 11.5 |
| Wittnauer 8VIS | 8.75 |
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Similar Mainspring Listing
This mainspring is similar to the mainspring used by the following movements. A similar mainspring differs slightly in one or more dimensions but may possibly still work as a replacement. When values differ the exact value is shown brackets for reference:
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