Does an Old 42mm Apple Watch Band Fit a New 42mm Apple Watch?
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No—an older 42mm Apple Watch band does not fit the newer 42mm models. The original Apple Watch and Series 1, 2 and 3 in 42mm use the larger band connector group. The 42mm Series 10, 11 and 12 use the smaller group.
The number is the same, but the band connection is different. Here’s how to choose the correct option when shopping at ORIBAND.
Why are there two different 42mm band sizes?
The size printed on your Apple Watch refers to the height of its case, not the width of its band connector.
On the original Apple Watch and Series 1–3, 42mm was the larger case option. When Apple introduced Series 10, 42mm became the smaller option alongside 46mm.
That means “42mm” alone is not enough information to choose a band. You also need to know your watch’s series.
Which Apple Watches use compatible band connectors?
Apple Watch bands fall into two main connector groups. Watches within each group accept bands designed for that group, even when their case sizes have different numbers.
Use this table to select between the two size options in our store:
| Your Apple Watch is… | Then choose… |
|---|---|
|
38mm: Original Apple Watch, Series 1, 2 or 3 40mm: Series 4, 5 or 6; SE 1, 2 or 3 41mm: Series 7, 8 or 9 42mm: Series 10, 11 or 12 |
38/40/41mm & 42mm (Series 10/11/12) |
|
42mm: Original Apple Watch, Series 1, 2 or 3 44mm: Series 4, 5 or 6; SE 1, 2 or 3 45mm: Series 7, 8 or 9 46mm: Series 10, 11 or 12 49mm: Apple Watch Ultra models |
42/44/45/46/49mm |
Remember: The smaller and larger connector groups are different. A band from one group is not a replacement for a band from the other. Always check the individual product’s compatibility options. Band compatibility reference.
Can you keep your bands when upgrading your Apple Watch?
Often, yes—as long as your old and new watches belong to the same connector group.
For example:
- Series 9, 41mm → Series 11, 42mm: Both use the smaller connector group.
- Series 9, 45mm → Series 11, 46mm: Both use the larger connector group.
- Series 3, 42mm → Series 11, 42mm: These use different connector groups, so you need a different band size.
The easiest rule is to match the connector group, rather than looking for the same case-size number.
What about Apple Watch Ultra bands?
Apple Watch Ultra models use the larger connector group. Compatible 44mm, 45mm and 46mm bands can be used with Ultra for casual, everyday wear.
For demanding outdoor or water activities, Apple recommends its purpose-designed Ultra bands, including the Ocean Band, Alpine Loop and Trail Loop. Connector compatibility and suitability for an activity are separate considerations. Apple’s band guidance.
How to check your Apple Watch before ordering
Look at the markings on the back of your watch to find its case size and series. You can also check its model information in the Watch app on your iPhone.
Then match those details to the table above and select the corresponding size option on the product page.
Connector size and wrist size are separate choices: after choosing the connector, check the band’s wrist-fit guide if one is provided.
Find a new look for your Apple Watch
Once you know your connector group, you can focus on choosing a color and style.
For a woven finish and a buckle-free design, explore the ORIBAND Braided Solo Loop Apple Watch Band. Or browse our Apple Watch band collection for more styles.
Before ordering a band for a 42mm Apple Watch, always check the series: Series 10–12 uses the smaller option; the original Apple Watch and Series 1–3 use the larger option.