Normcore Convex Precision Sieve Kit 54 & 58 mm

Normcore Convex Precision Sieve Kit

The espresso runs a little slower than usual, dark and even, and in the glass, a clarity remains at the end that one otherwise knows more from a good filter coffee: sweetness, a round body and a clean finish without harsh edges.

This sieve is a low-flow sieve with particularly fine holes of 0.18 mm. The convex bottom is milled from solid material – that's what "billet" means: manufactured from a solid block instead of pressed. The fine holes deliberately slow down the flow and give you a slow, quiet extraction. This is our observation, one of many.

The choice of sieve fundamentally changes the aroma profile – often more than many expect. Particle size and uniformity determine how cleanly extraction occurs, and pressure opens a time window in which the various aromatic compounds dissolve one after another. We always consider extraction in terms of weight ratio, 1:2 as a starting point, never by time alone. No right, no wrong – ultimately, what matters is that you enjoy the coffee.

Nobody needs a different sieve to make good espresso. But those who want to shape their extraction more consciously and explore a particularly calm, slow cup will find a tool here that is built precisely for that. You want it – or not, no must.

At a Glance

The 54 mm sieve fits into standard 54 mm portafilters, and the 58 mm sieve into standard 58 mm portafilters. The actual capacity may vary slightly depending on grind size, roast level, and humidity – no day and no shot are exactly alike, and that's the beauty of it.

Who it's for

For everyone who shapes their espresso through extraction and is looking for a clean, sweet, clear cup. Those who already work with weight ratios will find a sieve here that supports a slow, quiet extraction. Those who are simply curious about how much a sieve changes the character in the glass are also in the right place here.

Every coffee journey is valid. Whether you've been extracting for years or are just delving deeper – this sieve gives you a new lever without having to change your entire setup.

Recommended pairings

An evenly distributed coffee bed gets the most out of this sieve. For distribution, a WDT tool from our Barista Tools is worthwhile: affordable and precise with the Normcore WDT Tool, a step further in craftsmanship and feel with the Weber Workshops Moonraker.

For even tamping pressure, you'll find both options in our Tampers – the affordable, precise Normcore Tamper or the robustly manufactured Weber Workshops variant.

Because a clean flow begins with an even grind, a good grinder particularly pays off. Among our Coffee Grinders, the Varia VS3 is affordable and very consistent, while the Weber Workshops EG-1 is for those who want to go even further in consistency and flavor separation.

Are you unsure what suits your machine and taste? Our consultation tool will help you, and you can find the entire range in the Normcore Collection – we import Normcore directly to Switzerland.

Frequently Asked Questions

What does Low Flow with 0.18 mm mean?

The holes in this sieve measure 0.18 mm, making them finer than a classic sieve. This deliberately slows down the flow, giving you a particularly slow, controlled extraction.

Does the sieve fit in my portafilter?

The 54 mm sieve fits into standard 54 mm portafilters, and the 58 mm sieve into standard 58 mm portafilters.

What sizes and dosages are available?

The sieve is available in 54 mm and 58 mm, each designed for a dose of 18 g.

Can I see the product before buying?

Very gladly. You can experience it live in our showrooms in Bern (Gerberngasse 44) and Zurich (Hagenholzstrasse 50b). Purchases are mainly online, with delivery in 2-4 working days to Switzerland and Liechtenstein. We are always happy to answer your questions at office@coffeecoachingclub.ch or on coffeecoachingclub.ch.