# MagSafe charger puck and Apple Watch charger dimensions, MagSafe case thickness limit

> What is the diameter of the MagSafe charger?

- Category: Electronics › Chargers & cables
- Kind: Modern device
- Basis: Caliper measurements from a charger review site, a teardown and makers (MagSafe 25 W); Apple's accessory guidelines as reported by the press; Apple product listings for cable lengths
- Page: https://xemstudio.com/objects/magsafe-and-watch-chargers/ · JSON: https://xemstudio.com/api/geometry?object=magsafe-and-watch-chargers · Plain text: https://xemstudio.com/objects/magsafe-and-watch-chargers/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

**Exact dimensions.** True size, with no printing tolerance added.

## Notes

- MagSafe 25 W charger (2024+): Ø55.4–55.5 mm, 4.45–4.53 mm thick (three independent caliper measurements); braided cable about Ø2.35, 1 m or 2 m.
- Original 15 W MagSafe charger: makers report it slightly larger and thicker (about Ø56 × 5.4) but no reliable measurement is published; measure yours before cutting a press-fit pocket.
- MagSafe accessories (Apple's guidelines, as reported): case thickness over the magnet ring 2.0 mm recommended, 2.1 mm maximum; self-alignment within 1.55 mm; removal force 800–1,100 gf.
- Apple Watch magnetic fast charger: commonly given as Ø27.9 × 6.3 mm with a radial cable exit; Apple does not publish it, so check yours. The older puck is about 2 mm thicker (maker report). Cable 1 m.
- Inserts (free STL): the puck face sits flush, the cable leaves through the slot; glue into a stand or screw through the floor.

## Sizes

| item | diameter_mm | thickness_mm |
|---|---|---|
| MagSafe charger 25 W | 55.4–55.5 | 4.45–4.53 |
| MagSafe charger 15 W (unverified) | ≈56 | ≈5.4 |
| Apple Watch fast charger (unverified) | 27.9 | 6.3 |
| MagSafe case limit over the ring | None | 2.0 rec. / 2.1 max |

## Where the files are

- ChargerLAB: [Review of the Apple 25 W MagSafe charger (caliper measurements)](https://chargerlab.com/review-of-apple-25w-magsafe-charger) — web — Publisher's page; dimensions are facts
- ChargerLAB: [Teardown of the Apple 25 W MagSafe charger](https://chargerlab.com/teardown-of-apple-25w-magsafe-charger-hk-a2580) — web — Publisher's page; dimensions are facts
- MakerWorld (maker measurement): [MagSafe 25 W puck holder: 55.49 × 4.53](https://www.makerworld.com/en/models/897648) — web — Publisher's page; dimensions are facts
- 9to5Mac: [Apple's accessory design guidelines: MagSafe details](https://9to5mac.com/2020/11/02/apple-updates-its-accessory-design-guidelines-with-new-magsafe-details/) — web — Publisher's page; dimensions are facts
- Apple: [MagSafe Charger (1 m)](https://apple.com/shop/product/MX6X3LL/A/magsafe-charger-1-m) — web — Publisher's page; dimensions are facts
- Printables (maker notes): [MagSafe phone and watch stand](https://www.printables.com/model/996909-15w-magsafe-phone-and-watch-stand) — web — Publisher's page; dimensions are facts

## Free STEP/STL (3 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/magsafe-and-watch-chargers/index.json

- magsafe-25w-puck-envelope: [STEP](https://xemstudio.com/files/hardware/magsafe-and-watch-chargers/magsafe-25w-puck-envelope.step) · [STL](https://xemstudio.com/files/hardware/magsafe-and-watch-chargers/magsafe-25w-puck-envelope.stl) — MagSafe 25 W charger puck envelope Ø55.5 × 4.5 mm
- magsafe-25w-dock-insert: [STEP](https://xemstudio.com/files/hardware/magsafe-and-watch-chargers/magsafe-25w-dock-insert.step) · [STL](https://xemstudio.com/files/hardware/magsafe-and-watch-chargers/magsafe-25w-dock-insert.stl) — Dock insert for the MagSafe 25 W puck: Ø55.8 pocket 4.6 deep, 3 mm cable slot
- watch-charger-dock-insert: [STEP](https://xemstudio.com/files/hardware/magsafe-and-watch-chargers/watch-charger-dock-insert.step) · [STL](https://xemstudio.com/files/hardware/magsafe-and-watch-chargers/watch-charger-dock-insert.stl) — Dock insert for the Apple Watch fast charger puck: Ø28.2 pocket 6.4 deep (check your puck: see notes)

## Questions

**What size is the MagSafe charger?**

The 25 W MagSafe puck is about 55.5 mm across and 4.5 mm thick.

**How thick can a MagSafe case be?**

Apple recommends 2.0 mm over the magnet ring, 2.1 mm maximum.

## Fits with

- [iPhone 17 Pro](https://xemstudio.com/objects/iphone-17-pro/)
- [Apple Watch Series 10 / 11 (46 mm)](https://xemstudio.com/objects/apple-watch-series-10-11-46-mm/)
- [USB-C receptacle (16/24-pin, mid-mount)](https://xemstudio.com/objects/usb-c-receptacle/)