Buying a tamper, dosing funnel or bottomless portafilter for a Breville starts with one question: is your machine 54mm or 58mm? Get it wrong and the accessory won’t fit. Here’s the short answer, a model-by-model chart, and how to check your own machine.
Quick answer: Breville portafilter sizes
- 54mm: Bambino, Bambino Plus, Barista Express, Barista Express Impress, Barista Pro, Barista Touch, Infuser and Duo-Temp
- 58mm: Dual Boiler, Oracle, Oracle Touch and Oracle Jet
- Tamper to buy for 54mm machines: 53.3mm (sometimes sold as 53mm or 53/54mm)
- Tamper to buy for 58mm machines: 58mm
Table of contents
Breville portafilter size chart
| Model | Portafilter size | Tamper size to buy |
|---|---|---|
| Bambino | 54mm | 53.3mm |
| Bambino Plus | 54mm | 53.3mm |
| Barista Express | 54mm | 53.3mm |
| Barista Express Impress | 54mm | Built-in assisted tamping (53.3mm for a separate tamper) |
| Barista Pro | 54mm | 53.3mm |
| Barista Touch | 54mm | 53.3mm |
| Infuser | 54mm | 53.3mm |
| Duo-Temp | 54mm | 53.3mm |
| Dual Boiler | 58mm | 58mm |
| Oracle | 58mm | 58mm |
| Oracle Touch | 58mm | 58mm |
| Oracle Jet | 58mm | 58mm |
Why do 54mm Breville machines use 53.3mm tampers?
Breville quotes these portafilters as 54mm, but the inside of the basket, which is what the tamper has to fit, measures closer to 53.3mm. Tamper makers size for the basket, so you’ll see “53.3mm”, “53mm” and “53/54mm” tampers all sold for the same machines.
When you have a choice, 53.3mm leaves the smallest gap around the edge of the basket. Our tamper guide for Breville 54mm machines compares the best options.
How to measure your basket
If you’re not sure of your Breville portafilter size, or which model you have, or you’ve bought a third-party basket, measure it:
- Take the basket out of the portafilter.
- Lay a ruler across the inside of the rim at its widest point.
- About 53mm means a Breville 54mm-family basket. About 58mm means a 58mm basket.
Measure the basket, not the outside of the portafilter. Some Breville portafilters are wider across the body than the basket inside them.
Why the size matters for accessories
- Tampers and puck screens must match the basket’s inside diameter: 53.3mm for 54mm machines.
- Dosing funnels sit on the portafilter rim, so they’re sold as 54mm or 58mm. See our dosing funnel guide.
- Bottomless portafilters must match the machine’s group head: 54mm for the Bambino-to-Barista family, 58mm for the Dual Boiler and Oracle.
- Baskets need to match the portafilter. Breville’s 54mm double basket is sold as an 18g basket.
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What about the Barista Express Impress?
The Barista Express Impress uses a 54mm stainless steel portafilter, according to Breville. Its difference is assisted tamping: Breville says the machine applies a constant 22lb tamp with a 7-degree “barista twist”. You may not need a separate tamper at all, but if you buy one for the odd shot, choose 53.3mm.
Upgrading a 54mm Breville?
If you own a Bambino Plus, our Bambino Plus accessories guide lists the upgrades in the order that makes the biggest difference. Most of it also applies to the Barista Express, Pro and Touch.
Now you know their portafilter size, see our gifts for Breville espresso machine owners under $50.
Related guides
- Best Breville Barista Express accessories
- Best grinder for the Breville Bambino
- Best tamper for Breville 54mm portafilters
- Best dosing funnel for Breville 54mm
- Best Bambino Plus accessories
- How to use an espresso scale
Frequently asked questions
What size is the Breville Barista Express portafilter?
54mm. Accessories that fit it are usually sold as 53.3mm (tampers, puck screens, dosing cups) or 54mm (dosing funnels, portafilters).
What size is the Breville Bambino portafilter?
The Bambino and Bambino Plus both use a 54mm portafilter, the same size as the Barista Express, Pro and Touch.
Which Breville machines use a 58mm portafilter?
The Dual Boiler and the Oracle family: Oracle, Oracle Touch and Oracle Jet.
Can I use 58mm accessories on a 54mm Breville?
No. Tampers, baskets and portafilters must match. A 58mm tamper won’t fit inside a 54mm Breville basket.
Sources
Specifications and prices were checked against these sources in October 2026. Manufacturer pages are the best place to confirm current details.
