Swatch Sistem 51

    Every reference with a known width takes the same strap size. Your reference is engraved on the case back or between the lugs at 6 o'clock.

    19.8 mm

    From our database, not yet verified

    42 mm case

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    Indicative information. Check your watch before buying a strap: whatsmylugwidth.com is not responsible for an incorrect size.

    Collection25 references
    19.8 mm
    Illustration drawn to scale: 42 mm case, 19.8 mm lugs

    Lug widths across the line

    The Swatch Sistem 51 takes a 19.8 mm strap: all 25 references with a listed width in our database use 19.8 mm. Check the reference on your case back to be sure.

    Filter references by lug width

    25 Swatch Sistem 51 references

    Swatch Sistem 51 references in our database. Each card says where its width comes from: listed by the maker (linked to the maker's page in the details), two independent sources agree, or listed in our database and not yet verified by us.

    • SO30N400

      Sistem 51

      19.8 mm

      Database

    • SUTA401

      Sistem 51

      19.8 mm

      Database

      42 mmBlack dialPlastic/Resin

    • SUTB402

      Sistem 51

      19.8 mm

      Database

      42 mmBlack dialPlastic/Resin

    • SUTB403

      Sistem 51

      19.8 mm

      Database

      42 mmDark blue dialPlastic/Resin

    • SUTB404

      Sistem 51

      19.8 mm

      Database

      42 mmPrinted design dialPlastic/Resin

    • SUTB406

      Sistem 51

      19.8 mm

      Database

      42 mmBlack dialPlastic/Resin

    • SUTB407

      Sistem 51

      19.8 mm

      Database

      42 mmMulticolour dialPlastic/Resin

    • SUTB408

      Sistem 51

      19.8 mm

      Database

      42 mmWhite dialPlastic/Resin

    • SUTC401

      Sistem 51

      19.8 mm

      Database

      42 mmBlack dialPlastic/Resin

    • SUTG400

      Sistem 51

      19.8 mm

      Database

      42 mmTurquoise dialPlastic/Resin

    • SUTG401

      Sistem 51

      19.8 mm

      Database

      42 mmBlack dialPlastic/Resin

    • SUTM400

      Sistem 51

      19.8 mm

      Database

      42 mmBlack dialPlastic/Resin

    • SUTN403

      Sistem 51

      19.8 mm

      Database

      42 mmBlue dialPlastic/Resin

    • SUTN404

      Sistem 51

      19.8 mm

      Database

      42 mmBlue dialPlastic/Resin

    • SUTN405

      Sistem 51

      19.8 mm

      Database

      42 mmBlue dialPlastic/Resin

    • SUTP401

      Sistem 51

      19.8 mm

      Database

      42 mmBlue dialPlastic/Resin

    • SUTR400

      Sistem 51

      19.8 mm

      Database

      42 mmBlack dialPlastic/Resin

    • SUTR401

      Sistem 51

      19.8 mm

      Database

      42 mmBlack dialPlastic/Resin

    • SUTR403

      Sistem 51

      19.8 mm

      Database

      42 mmBlack dialPlastic/Resin

    • SUTS401

      Sistem 51

      19.8 mm

      Database

      42 mmBlack dialPlastic/Resin

    • SUTT400

      Sistem 51

      19.8 mm

      Database

      42 mmBlue dialPlastic/Resin

    • SUTW400

      Sistem 51

      19.8 mm

      Database

      42 mmWhite dialPlastic/Resin

    • SUTW402

      Sistem 51

      19.8 mm

      Database

      42 mmSilver dialPlastic/Resin

    • SUTW404

      Sistem 51

      19.8 mm

      Database

      42 mmBlack dialPlastic/Resin

    • SUTW405

      Sistem 51

      19.8 mm

      Database

      42 mmBlack dialPlastic/Resin

    FAQ

    What lug width does the Swatch Sistem 51 use?

    The Swatch Sistem 51 takes a 19.8 mm strap: all 25 references with a listed width in our database use 19.8 mm. Check the reference on your case back to be sure. These widths come from our database and are not yet verified.

    Where do these Swatch Sistem 51 lug widths come from?

    From our database, which lists 25 Swatch Sistem 51 references, 25 of them with a listed width. Each reference card says whether the maker lists the width, two independent sources agree on it, or it is not yet verified.

    Other Swatch collections

    All Swatch collections

    Help

    What is lug width?

    The gap between the two lugs that hold the strap, in millimetres. A new strap must match it exactly: 20 mm lugs take a 20 mm strap.

    Measure it in 30 seconds

    1. Take the strap off, or look at the back of it: many straps print their width.
    2. Measure the inside gap between the lugs with a caliper or a millimetre ruler.
    3. Round to the nearest whole millimetre. Most watches use 18, 20 or 22 mm.

    Strap, quick release or system?

    Most watches use spring bars, so any strap of the right width fits. Many smartwatches use their own band system instead, such as Apple Watch bands or Garmin QuickFit.