Swatch Sistem 51
Most Swatch Sistem 51 references take a 20 mm watch strap: 25 of 44.
Swatch Sistem 51 lug width by case size
44 references measured. Updated 2026-10-29.
| Case | Lug width | References | Watch strap attachment | For example |
|---|---|---|---|---|
| 42 mm | 20 mm · 16 mm on 19 | 44 | — | SUTB400, SUTB402, SUTF400 |
References that take a different watch strap
- SUTA401: 16 mm, not the 20 mm of most 42 mm cases
- SUTB403: 16 mm, not the 20 mm of most 42 mm cases
- SUTB404: 16 mm, not the 20 mm of most 42 mm cases
- SUTC401: 16 mm, not the 20 mm of most 42 mm cases
- SUTM400: 16 mm, not the 20 mm of most 42 mm cases
- SUTM401: 16 mm, not the 20 mm of most 42 mm cases
- SUTN403: 16 mm, not the 20 mm of most 42 mm cases
- SUTO401: 16 mm, not the 20 mm of most 42 mm cases
- SUTR400: 16 mm, not the 20 mm of most 42 mm cases
- SUTR403: 16 mm, not the 20 mm of most 42 mm cases
- SUTT400: 16 mm, not the 20 mm of most 42 mm cases
- SUTW400: 16 mm, not the 20 mm of most 42 mm cases
- YIS402: 16 mm, not the 20 mm of most 42 mm cases
- YIS404: 16 mm, not the 20 mm of most 42 mm cases
- YIS406: 16 mm, not the 20 mm of most 42 mm cases
- YIS408: 16 mm, not the 20 mm of most 42 mm cases
- YIS411: 16 mm, not the 20 mm of most 42 mm cases
- YIS412G: 16 mm, not the 20 mm of most 42 mm cases
- YIS414: 16 mm, not the 20 mm of most 42 mm cases
Questions about the Swatch Sistem 51
Can two Swatch Sistem 51 watches with a 42 mm case take different watch straps?
Yes. Of the 44 Swatch Sistem 51 references with a 42 mm case, 25 take 20 mm and 19 take 16 mm. The reference number decides, not the case size alone.
Every Swatch Sistem 51 reference
- Sistem CloudsSUTA401
16 mm - Sistem BlackSUTB400
20 mm - Sistem ChicSUTB402
20 mm - Sistem NotteSUTB403
16 mm - Sistem SchwiizSUTB404
16 mm - Sistem FudgeSUTC401
16 mm - Sistem GentlemanSUTF400
20 mm - Sistem GreenSUTG400
20 mm - Sistem FrogSUTG401
20 mm - Sistem CreamSUTM400
16 mm - Sistem AshSUTM401
16 mm - Sistem NavySUTN400
20 mm - Sistem GridSUTN401
20 mm - Sistem AquaSUTN402
20 mm - Sistem SeaSUTN403
16 mm - Sistem Sea FlexSUTN403C
20 mm - Sistem TangerineSUTO401
16 mm - Sistem RedSUTR400
16 mm - Sistem PinkSUTR401
20 mm - Sistem CorridaSUTR403
16 mm - Sistem BlueSUTS401
20 mm - Sistem ClassSUTS402
20 mm - Sistem IncognitoSUTT400
16 mm - Sistem WhiteSUTW400
16 mm - Sistem ArlequinSUTW402
20 mm - Sistem PolkaSUTW403
20 mm - Sistem PlanetSUTW404
20 mm - Sistem SlateYIB400
20 mm - Sistem EarthYIS400
20 mm - Sistem BorealYIS401G
20 mm - Sistem SoulYIS402
16 mm - Sistem ArrowYIS403
20 mm - Sistem FlyYIS404
16 mm - Sistem TuxYIS405G
20 mm - Sistem SnowYIS406
16 mm - Sistem KhakiYIS407G
20 mm - Sistem PuzzleYIS408
16 mm - Sistem NavyYIS409
20 mm - Sistem NuggetYIS410G
20 mm - Sistem SandYIS411
16 mm - Sistem CheckYIS412G
16 mm - Sistem DarkYIS413
20 mm - Sistem SolaireYIS414
16 mm - Sistem PolaireYIS415
20 mm
Other Swatch families
Inside each one the lug width often changes: it is the reference that decides.
All Swatch families → · Why the size changes inside a family →