Part / accessory · Apple

Apple 42mm Burgundy Sport Loop

verified 2026-10-07 Specs from Apple Store product page (Compatibility: 38/40/41/42mm). Also known as: 42mm burgundy sport loop, mk864am/a.

Specs

band groupsmall
listed case sizes mm38; 40; 41; 42

Fits

  • band Apple Watch band, small group (38/40/41mm and NEW 42mm)
    Fits Apple Watch cases of 38mm, 40mm, 41mm, and the 42mm case of Series 10 and later.

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Good to know
  • GOTCHA: "42mm" means two different things. The 42mm case of Series 10/11/12 takes SMALL-group bands (Apple sells current 42mm bands as fitting 38/40/41/42mm). The 42mm case of Series 1-3 takes LARGE-group bands (Apple: bands for 42mm, 44mm and 45mm cases are compatible with each other).
  • A "42mm band" bought new from Apple today is a small-group band: it will NOT fit a Series 3 (or earlier) 42mm watch.
  • Small-group and large-group bands are not interchangeable.

What does the Apple 42mm Burgundy Sport Loop work with?

6 models in the graph.

Informational only. Confirm with the manufacturer before buying or installing. Spotted a mistake? Report it.