What fits a 51 mm De’Longhi

De’Longhi uses a 51 mm group that belongs to nobody else. This is the most common way money gets wasted on these machines: the parts you will see everywhere are made for Breville (54 mm) or for prosumer machines (58 mm), and neither will go in. Filter every listing by 51 mm before you look at anything else.

Cut-away of two basket floors: a dual-wall pressurised floor with a single hole, and a single-wall floor with many fine holes. — **Left: pressurised** — one exit hole, so it makes crema regardless of grind. **Right: non-pressurised** — many holes, so the coffee bed controls the flow. **About this image:** it is an AI-rendered schematic, not a photograph of real hardware. The geometry was checked against manufacturer documentation and the sources listed at the foot of this page.

Machines in the 51 mm group

De’Longhi Dedica / Dedica Arte (EC680 · EC685 · EC885) — The Dedica ships with a pressurised basket, which masks grind quality. Moving to a non-pressurised 51 mm basket is the usual first upgrade — but it only pays off once you have a real grinder.
De’Longhi Linea Classic (EM450M) — Sold with pressurised baskets. The 51 mm parts that fit the Dedica fit this machine too, but check the listing names your model — De’Longhi uses more than one portafilter format across its range.

Every size for this group

Part	Size	Why it matters
Portafilter	51 mm	De’Longhi uses its own 51 mm size. Neither 54 mm (Breville) nor 58 mm (commercial) parts will fit.	Check price ↗
Filter baskets	51 mm	★ The stock basket is pressurised — it forces crema regardless of grind, which hides both good and bad grinding. A non-pressurised 51 mm basket is the standard upgrade, but only makes sense with a real grinder.	Check price ↗
Tamper	51 mm	Must be 51 mm. The plastic scoop-tamper in the box is the single biggest limiter on this machine.	Check price ↗
Dosing funnel	51 mm	Sits on the portafilter rim so grounds do not spill.	Check price ↗
Puck screen	51 mm	Sits on top of the puck. Sold for the Dedica in 51 mm, typically around 150 µm mesh.	Check price ↗
Distribution / leveller	51 mm	Levels the grounds before tamping. Adjustable-depth versions let you match the shallow 51 mm basket.	Check price ↗
WDT tool	Universal	Needles break up clumps. Not size-specific — and it matters more here than on any other machine, because the basket is small.	Check price ↗
Knock box	Universal	Not size-specific.	Check price ↗
Scale	Slim preferred	The Dedica is very narrow with little clearance under the spouts — a slim scale fits best.	Check price ↗

De’Longhi’s 51 mm is its own ecosystem. Parts sold for Breville (54 mm) or prosumer machines (58 mm) will not fit, so filter every listing by 51 mm.

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