De'Longhi Dedica/SMEG 51mm Bottomless Portafilter (Rosewood)

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When selecting the appropriate portafilter or accessories for your espresso machine, it is essential to understand the dimensions and compatibility of the various sizes available. This guide provides a detailed sizing chart for 51mm, 54mm, and 58mm portafilters, which are the most commonly used sizes in the industry.

51mm

De'Longhi Dedica/SMEG 51mm (3 Ear Portafilter)

• De'Longhi Dedica (EC680, EC685, EC885)
• SMEG 50s Style Espresso Coffee Machine (ECF01, ECF02)
• EUPA (TSK-1837B, TSK-1819A)
  
  

De'Longhi La Specialista 51mm (i9 3 Ear Portafilter)

• La Specialista Opera, Arte, Maestro & Touch (EC9115, EC9155, EC9255, EC9335, EC9455M, EC9665, EC9865, EC9885)
• Dedica Maestro (EC900M, EC950M)

54mm

53mm Accessories are used with 54mm baskets/portafilters

Breville 54mm (3 Ear Portafilter)

• Breville Barista Express (BES870, BES875, BES876)
• Breville Barista Pro (BES878)
• Breville Barista Touch (BES880, BES881)
• Breville Infuser (BES840)
• Breville Bambino (BES450)
• Breville Bambino Plus (BES500)
• Solis Barista Perfetta Plus

58mm

E61 58mm (2 Ear Portafilter)

• All Machines using E61 Group Head
  
• Ascaso
• Gemilai G3006, 3005, 3035, 3211
• ECM
• Lelit
• Rocket R58
• Rancilio
• Sanremo
• Profitec
• Kaffa
• Faema
• Fellow ES1
• EUPA (TSK-1858B,TSK-1899B)
• Expobar
• Vibiemme
• Wendougee Data S

Breville 58mm (Breville 9 Series 2 Ear Portafilter)

• Breville Dual Boiler (BES920)
• Breville The Oracle Series (BES980, BES985, BES990, BES995)
  
  

Gaggia

• Compatible with all 58mm Gaggia espresso machines

KitchenAid

• KitchenAid Semi Automatic Espresso Machine Series (KES6551)

Sunbeam

• Sunbeam Mini Barista (EM4300K)
  
• Sunbeam Barista Max (EM5300K)
  
• Sunbeam Barista Plus (EMM5400)
  
• Sunbeam Origins Series (EMM4500, EMM5500, EMM6500, EMM7300SS)
  

La Marzocco

• Linea Mini
• Linea Classic
• GS3
• Linea Micra 

If you're unsure which portafilter or accessory to choose, or can't see your machine listed above, contact us and we can assist. 

What is a Bottomless/Naked Portafilter?

A bottomless portafilter lets you see the espresso flow directly from the basket, offering a clear view of your extraction process. It's perfect for spotting channeling—an issue where water finds weak points in your coffee puck, rushing through unevenly and leading to a bitter, uneven shot.

With a bottomless portafilter, channeling shows up as erratic, splattery streams or gaps in the flow. Ideally, you want a smooth, honey-like stream that forms evenly from the basket. If you notice channeling, it’s a cue to adjust your grind, improve your tamp, or distribute the coffee grounds more evenly. It’s like a diagnostic tool for better shots!

Is a Bottomless Portafilter Better?

It depends on what you’re after! A bottomless portafilter is a great tool for dialing in your espresso. It gives you a clear view of how your shot’s pulling—any uneven flow or channeling is easy to spot.

Plus, it’s easier to clean, works with a wider range of basket sizes, and let’s be honest, it looks amazing in action!

That said, it’s less forgiving than a spouted portafilter if your technique’s off. If you love geeking out over your espresso and tweaking your grind and tamp, it’s definitely worth the upgrade.

Are Portafilter Baskets Universal?

No, portafilter baskets come in various sizes and designs to fit different machines, with common diameters being 58mm, 54mm, and 51mm.
While compatibility is key, a bottomless portafilter offers more flexibility since it doesn’t have the fixed height of a spouted portafilter. Always check your machine's requirements to ensure the right fit.

How do I care for my portafilter?

To keep your portafilter in great condition, avoid placing it in the dishwasher and don’t use any soaps or cleaning detergents, as these can damage the finish over time. Instead, simply rinse it under hot water after each use to remove coffee residue, then dry it thoroughly with a microfibre towel to protect the surface. This gentle routine will help maintain both the appearance and longevity of your portafilter.