What size portafilter does the Breville Barista Express use?
The Breville Barista Express uses a 54mm portafilter (proprietary 54mm).
Do 58mm baskets fit the Breville Barista Express?
No. The Breville Barista Express uses a 54mm portafilter, so 58mm baskets do not fit — you need parts made for the 54mm format.
Does the Breville Barista Express take pressurized or non-pressurized baskets?
It uses both pressurized and non-pressurized (single- and dual-wall) baskets.
Which baskets are confirmed to fit the Breville Barista Express?
Breville 54mm Filter 1 Cup Dual Wall; Breville 54mm Filter 2 Cup Dual Wall; Breville 54mm Filter 2 Cup Single Wall; IMS B62 Competition 1 Cup 54mm (B62.51TH23E); IMS B62 Competition 2 Cup 54mm (B62.52TH24E) — each verified against manufacturer sources (listed below).
Sources
https://www.breville.com/en-us/product/bes870(archived) — Official Breville (US) product page for the Barista Express BES870, read firsthand 2026-07-04. States verbatim that the machine includes a '54 mm stainless steel portafilter', '1 cup & 2 cup Single & Dual Wall Filter Baskets', and an 'Integrated Tamper'. Single-wall is Breville's term for non-pressurized baskets and dual-wall for pressurized, so both basket types ship in the box.
https://www.breville.com/en-us/product/sp0027237(archived) — Official Breville replacement-part page 'Portafilter Assembly 54mm for selected Breville Espresso Machines', read firsthand 2026-07-04 — corroborates the 54mm portafilter size from Breville's own parts catalogue.