Astoria/RIO/Brasilia Factory Cut Bottomless Portafilter

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This bottomless portafilter will fit some, but not all models of Astoria, RIO & Brasilia espresso machine group heads. The standard bottomless or naked portafilter features a clean precision cut and chrome job where the bottom and spout once resided. It measures 79.5mm across at the widest point (the "ears") on the top. The ears measure 6mm tall at the thickest point. The opening on the bottom measures 62mm inside diameter. Includes a 21 gram basket, suitable for 58 mm and smaller tamper bases.

Using this portafilter the barista can watch the coffee brew right from the bottom of the filter basket and know immediately if channeling occurs, signaling the user that a level tamp was not made which makes this an invaluable tool for training.

This is an item that created quite a stir in the specialty coffee industry, crossing over to espresso hobby and enthusiasts as well. The bottomless portafilter has been referred to as "naked", but what ever you call it, it is truly a revelation. Another innovation Espresso Parts brought it to the market first, originally modifying our own with just exposed brass on the bottom and no chrome.

For an excellent guide on trouble shooting or "Perfecting the Naked Portafilter Extraction" read the article of the same title on

Caution: This portafilter has been produced by a machine parts manufacturer, machine milled to get the cleanest, smoothest surface possible. Please note that the inside is chromed all the way through and the bottom edge is very precise and can be relatively sharp.

More Information
Manufacturer LF
Size Short (10 cm)

3.00 Average

2 Reviews


Compared to the original portafilter this item was flimsy and light weight. It was so thin that it was bent and warped to a point that it would not seal. I had to return it and braze some additional material to the original and remachine it. This was not a useful purchase at all. Luckily the return process has been painless ( we’ll see when the refund hits my account though).


We're using this with an old Astoria lever machine, this is a very welcome improvement, allowing insight into how well the puck was tamped in the basket. Also, with less surface for the shot to traverse, it's far easier to keep clean.