Apple Watch straps are designed to be compatible with specific case sizes but are generally interchangeable within their size groups. Here's a breakdown of which Apple Watch strap sizes are compatible with which Apple Watch models, based on the case size:
Small Case Sizes:
Series 1, 2, and 3 (38mm)
Series 4, 5, SE, and 6 (40mm)
Series 7, 8 and 9 (41mm)
Series 10 (42mm)
Large Case Sizes:
Series 1, 2, and 3 (42mm)
Series 4, 5, SE, and 6 (44mm)
Series 7, 8, 9 and SE (45mm)
Series 10 (46mm)
Ultra (49mm)
In summary, when deciding on a strap for your Apple Watch, focus on the case size of your watch rather than its generation. Always consult compatibility guides or product specifications when in doubt, especially when dealing with newer models or ultra-specific bands.
