If you run a café or work on a commercial espresso machine, knowing your portafilter size is essential before buying accessories, upgrading baskets, or sourcing replacement parts. Get the wrong size and nothing fits. Get it right and you unlock a whole world of precision tools that can help you pull more consistent shots, faster.
Here’s everything you need to know about portafilter sizes across the commercial machines you’ll find in independent UK cafés — including a few exceptions that catch people out.
The Commercial Standard: 58mm
Almost every commercial espresso machine used in UK cafés takes a 58mm portafilter. This has been the industry standard since the original Faema E61 group head set the template back in 1961, and it remains dominant today across virtually all serious commercial equipment. The 58mm diameter gives water a wide, even path through the coffee puck, which supports consistent extraction at high volume — exactly what a busy bar needs.
The practical benefit for café owners is the accessory ecosystem. Tampers, dosing rings, distribution tools, precision baskets, and bottomless portafilters are all widely available in 58mm — far more so than any other size. If you’re investing in bar tools, you’re in the right place.
Which Commercial Machines Use 58mm?
La Marzocco
All La Marzocco commercial machines — including the Linea PB, Linea Classic S, KB90, Strada, and GB5 — use a 58mm group head. La Marzocco is one of the most widely used commercial espresso machine brands in UK independent cafés, and their portafilter handles are specific to the brand, though the 58mm filter baskets inside are standard and interchangeable with other 58mm machines.
Victoria Arduino
Victoria Arduino machines — including the Eagle One, Eagle One Prima, Black Eagle, and Maverick — all use 58mm portafilters. The Eagle One range comes with chrome-plated brass portafilters with leather-wrapped handles as standard, and the baskets are compatible with VST precision baskets for baristas who want tighter tolerances.
Fracino
Fracino is the UK’s only commercial espresso machine manufacturer, and all of their commercial machines — the Contempo, Retro, Bambino, and Romano — use 58mm portafilters and filter baskets. This makes Fracino machines fully compatible with the same accessories used on Italian commercial machines, which is a practical advantage for café owners sourcing tools.
Nuova Simonelli and other E61-style machines
Machines built around the classic E61 group head — including those from Nuova Simonelli, ECM, Faema, Sanremo, and Bezzera — all use 58mm portafilters. The E61 group head is one of the most enduring designs in espresso history and its 58mm standard has shaped the entire accessories market.
The Exceptions: La Cimbali and La Spaziale
La Cimbali — 57mm
La Cimbali is a notable exception. Many La Cimbali commercial machines — including models in the M24, M25, and M27 range — use a 57mm group head rather than the standard 58mm. While the difference is just 1mm, it matters: a 58mm tamper won’t fit correctly in a 57mm basket and will leave untamped coffee around the edge, causing channelling and uneven extraction. Always check the specific La Cimbali model before ordering accessories.
La Spaziale — 53mm
La Spaziale takes a different approach entirely. Their commercial machines — including the S1, S3, S5, and S40 — use a 53mm portafilter. This is a deliberate design choice, not a compromise. The narrower diameter creates a deeper coffee puck, which La Spaziale argue makes extraction more forgiving — water has further to travel through the coffee bed, which can reduce channelling and produce full-bodied shots with good consistency.
The practical implication is that standard 58mm accessories won’t fit. You’ll need 53mm-specific tampers, baskets, and dosing tools. The good news is that IMS make precision baskets for La Spaziale machines, so quality upgrade options are available — you just need to source them specifically.
Same Size Doesn’t Always Mean Compatible Portafilters
Even across machines sharing the same 58mm portafilter size, the portafilter handles themselves are usually brand-specific. The locking tabs — often called ‘ears’ — vary in shape, thickness, and configuration between brands. A La Marzocco portafilter won’t lock cleanly into a Victoria Arduino group head, even though both are 58mm.
However, the filter baskets inside are a different story. Baskets of the same diameter are generally interchangeable between machines — so you can use an IMS or VST precision basket in your La Marzocco, your Fracino, or your Victoria Arduino without any issue.
Quick Reference: Commercial Machines and Portafilter Sizes
La Marzocco (Linea PB, Linea Classic S, KB90, Strada, GB5): 58mm
Victoria Arduino (Eagle One, Black Eagle, Maverick): 58mm
Fracino (Contempo, Retro, Bambino, Romano): 58mm
Nuova Simonelli / E61-style machines (ECM, Faema, Sanremo): 58mm
La Cimbali (M24, M25, M27 traditional range): 57mm — check your specific model
La Spaziale (S1, S3, S5, S40): 53mm — brand-specific accessories required
If you’re ever unsure, the safest approach is to measure the inside diameter of your filter basket directly — or check with your machine supplier before buying accessories.