Formex AirField Automatic

    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.

    20 mm

    From our database, not yet verified

    40 mm case · 2026

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

    Collection4 references
    20 mm
    Illustration drawn to scale: 40 mm case, 20 mm lugs

    Lug widths across the line

    The Formex AirField Automatic takes a 20 mm strap: all 4 references with a listed width in our database use 20 mm. Check the reference on your case back to be sure.

    Filter references by lug width

    4 Formex AirField Automatic references

    Formex AirField Automatic 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.

    • 0661.1.6556.899

      AirField Automatic Desert Sand 40 mm

      20 mm

      Database

      40 mm2026Desert Sand dialTitanium grade 2

      Attachment
      Nylon Velcro or leather strap / straight quick-release spring bars
      Movement
      Automatic
      Caseback
      Screw titanium
      Status
      Listed in our database, not yet verified

    • 0661.1.6526.877

      AirField Automatic Jet Black 40 mm

      20 mm

      Database

      40 mm2026Jet Black dialTitanium grade 2

      Attachment
      Nylon Velcro or leather strap / straight quick-release spring bars
      Movement
      Automatic
      Caseback
      Screw titanium
      Status
      Listed in our database, not yet verified

    • 0661.1.6546.822

      AirField Automatic Tarmac Grey 40 mm

      20 mm

      Database

      40 mm2026Tarmac Grey dialTitanium grade 2

      Attachment
      Nylon Velcro or leather strap / straight quick-release spring bars
      Movement
      Automatic
      Caseback
      Screw titanium
      Status
      Listed in our database, not yet verified

    • 0661.1.6536.840

      AirField Automatic Horizon Blue 40 mm

      20 mm

      Database

      40 mm2026Blue dialTitanium

      Attachment
      Nylon or leather strap
      Style
      pilot
      Movement
      Automatic
      Caseback
      Screw titanium
      Status
      Listed in our database, not yet verified

    FAQ

    What lug width does the Formex AirField Automatic use?

    The Formex AirField Automatic takes a 20 mm strap: all 4 references with a listed width in our database use 20 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 Formex AirField Automatic lug widths come from?

    From our database, which lists 4 Formex AirField Automatic references, 4 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 Formex collections

    All Formex 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.