A layered birch bottomless portafilter with its basket in place; the basket's inside diameter is the size this guide helps you find

Which Portafilter Size Do I Have?

Portafilter, tamper and puck-screen size is the inside diameter of your basket in millimetres. Most home machines are 54 mm or 58 mm. Find your machine in the table, or measure the basket in a minute.

October 4, 2026Buying Guides2 min read

  • Portafilters
  • Tampers
  • Puck Screens
  • Compatibility
  • Buying Guide

Portafilter and puck-screen size is the inside diameter of your basket, in millimetres. Most home machines are 54 mm or 58 mm. Find your machine below, or measure the basket. The number that matters is the basket's, not the portafilter body's, the group head's or anything printed on the box.

Find your machine

Basket size by machine family
Machine familyBasket sizeWhat fits
Breville / Sage: Bambino, Bambino Plus, Infuser, Duo-Temp Pro, Barista Express, Barista Pro, Barista Touch54 mmOur 54 mm portafilters and the 54 mm tamper; the 53.5 mm Breville/Sage puck screen
Breville / Sage Dual Boiler and Oracle58 mmThe 58 mm tamper and the 58.5 mm (E61) puck screen. Our 58 mm portafilters are made for E61 group heads; check the listing's fit line before ordering one for a Breville
E61 group heads: Rocket, ECM, Profitec, Lelit and other E61 machines58 mmOur 58 mm portafilters and the 58 mm tamper; the 58.5 mm (E61) puck screen
Rancilio Silvia58 mmThe 58 mm tamper and the 58.5 mm (E61) puck screen. The Silvia is not an E61 group, so check the portafilter listing's fit line before ordering one
La San Marco54.5 mmThe 54.5 mm La San Marco puck screen only. We do not make a 54.5 mm portafilter or tamper
De'Longhi Dedica and other 51 mm machines51 mmWe do not make a 51 mm portafilter or tamper. The puck screen listing carries a 50.5 mm size with no machine named; check it against your basket before ordering

The puck screen listing names its sizes by the screen's own diameter rather than the basket's nominal size: 53.5 mm for 54 mm Breville/Sage baskets, 58.5 mm for 58 mm E61 baskets, 54.5 mm for La San Marco. Pick by the machine named next to the size.

Measure it yourself

  1. Take the basket out of the portafilter. You are measuring the basket, not the portafilter body or the group head.
  2. Measure the inside diameter across the top rim, in millimetres, with a ruler or caliper. Measure twice, at right angles, and use the larger reading.
  3. 53 to 54.5 mm: a 54 mm machine. A full 54.5 mm on a La San Marco is that machine's own size.
  4. 57.5 to 58.5 mm: a 58 mm machine.
  5. About 51 mm: a 51 mm machine, such as the De'Longhi Dedica. We do not make 51 mm portafilters or tampers.
  6. Anything else, or a reading you do not trust: email us the machine model and the measurement. A person answers within one business day.

What the number does not tell you

Basket size alone decides whether a tamper or puck screen fits. A portafilter also has to lock into your group head, so every portafilter listing names the machines it fits as well as its size. If your machine is not named on the listing, ask before ordering.

Set your size once

Choose 54 mm or 58 mm on the homepage or in the catalog and the parts that fit lead the list. Every product page then says whether the part fits the machine you set.