Portafilter Size Guide: 51mm vs 54mm vs 58mm — Which Do You Have?

51mm vs 54mm vs 58mm: Which Portafilter Size Do You Have?

Every espresso accessory — tampers, distributors, dosing cups, puck screens — has to match your machine's portafilter diameter. Get it wrong and nothing fits. This guide covers the three standard sizes, which machines use which, and the exceptions worth knowing before you order.

The three sizes, at a glance

Size	Where you'll find it	What it means for your shot
51mm	Most De'Longhi home machines, plus a few compact brands	Smaller dose capacity, deeper puck. Fully capable of great espresso with the right accessories — though the aftermarket range is narrower than 58mm.
54mm	Effectively unique to Breville / Sage	A middle ground — more forgiving than 58mm, more headroom than 51mm. The go-to for home baristas stepping up from entry-level machines.
58mm	The commercial and prosumer standard — E61 groupheads and most independent brands	The largest surface area, generally the most even extraction, and by far the widest range of aftermarket tampers, baskets, and tools.

Find your machine

These are the machines we get asked about most. If yours isn't listed, see "Still not sure?" below.

51mm machines

De'Longhi Dedica (all models)
De'Longhi La Specialista (all models)
De'Longhi Icona
Smeg ECF01 / ECF02

Note: some older De'Longhi models used a 49mm basket rather than 51mm. If your machine is more than a few years old, measure before ordering.

54mm machines

Sage / Breville Barista Express
Sage / Breville Barista Pro
Sage / Breville Barista Touch
Sage / Breville Bambino Plus

Exception: the Sage/Breville Dual Boiler and Oracle Touch use 58mm — not 54mm — despite being in the same product family. Always check your specific model.

58mm machines

Gaggia Classic (Pro and Evo Pro)
Sage / Breville Dual Boiler
Sage / Breville Oracle Touch
La Marzocco (all home and commercial models)
Rocket Espresso (all models)
ECM
Lelit
La Spaziale
Victoria Arduino
Fracino
Casadio
Most E61-grouphead machines

Worth knowing: not all 58mm portafilters are interchangeable. Gaggia uses its own locking-ear design — a Gaggia-specific accessory will seat more securely than a universal 58mm. La Cimbali is a separate case: some models use a 57mm brew group, which is close but not the same. If you own a Gaggia or Cimbali, check the product description or contact us before ordering.

Other sizes

46mm — Flair manual espresso makers (except the Flair 58, which uses 58mm)
53mm — the Luca A53 Mini and some Gastroback models depending on generation

Still not sure?

If your machine isn't listed, measure directly: remove the basket from your portafilter and measure the inside diameter with calipers or a ruler. It'll almost always land at 51mm, 54mm, or 58mm. If you're between two measurements or want a second opinion, send us your machine's make and model and we'll confirm the right size before you order.