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Which Bands Fit the Apple Watch Series 4 (40mm)?

Your Apple Watch Series 4 (40mm) fits Small Group bands

ALL bands in this group are interchangeable. A 38mm band from 2015 fits a Series 11 42mm watch. The connector/lug mechanism has stayed the same across all generations.

Apple Watch Series 4 (40mm) Details

Series

Series 4

Case Size

40mm

Size Group

Small Group

Release Year

2018

Current Gen

No

Compatible Band Sizes

38mm40mm41mm42mm (Series 10/11)

All Compatible Watches (11 models)

Any band that fits these watches also fits your Apple Watch Series 4 (40mm).

Apple Watch Series 1 (38mm)38mmApple Watch Series 3 (38mm)38mmApple Watch Series 5 (40mm)40mmApple Watch Series 6 (40mm)40mmApple Watch SE (1st Gen, 40mm)40mmApple Watch SE (2nd Gen, 40mm)40mmApple Watch Series 7 (41mm)41mmApple Watch Series 8 (41mm)41mmApple Watch Series 9 (41mm)41mmApple Watch Series 10 (42mm)42mmApple Watch Series 11 (42mm)42mm

Shop Bands for Apple Watch Series 4 (40mm)

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View Full Compatibility Matrix →Back to Watch Bands Hub →38mm vs 42mm Band Confusion →

Frequently Asked Questions

What band size does the Apple Watch Series 4 (40mm) use?

The Apple Watch Series 4 (40mm) is in the Small Group (small group). It fits bands sized: 38mm, 40mm, 41mm, 42mm (Series 10/11).

Can I use older bands on the Apple Watch Series 4 (40mm)?

Yes! Any band from the small size group works. Apple has kept the connector mechanism identical within each group since the original Apple Watch. ALL bands in this group are interchangeable. A 38mm band from 2015 fits a Series 11 42mm watch. The connector/lug mechanism has stayed the same across all generations.

How many other Apple Watch models share bands with the Apple Watch Series 4 (40mm)?

11 other models share the same band connectors: they are all in the small size group.