51mm is De'Longhi's proprietary portafilter size, used across the Dedica and La Specialista pump-espresso lines. It's close to — but not the same as — the 52mm La Pavoni lever format, and standard 58mm or 54mm Breville parts do not fit. De'Longhi machines take both single-wall (non-pressurized) and dual-wall (pressurized) baskets, and De'Longhi's own DLSC085 bottomless portafilter is made for this size.
New to portafilter sizing? See espresso portafilter sizes explained for how 51mm compares to the other standards and why parts don’t interchange across sizes. Also useful: which tamper size fits and groupheads explained.
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