Buying task · Tamping
Tampers and tamping
Choose a tamper by your basket's size, not the portafilter label. Why force matters less than a level tamp, and when a calibrated tamper helps.
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Short answer
Buy a tamper sized for your basket, not for the number on the portafilter, and press it down level until the coffee stops compressing. For Breville's 54 mm machines that means a tamper of about 53.3 mm.[1] The 58 mm baskets from IMS and VST are designed for tampers of 58 to 58.4 mm.[2][3] The force itself matters little: in a controlled comparison, tamps of 5 to 20 kg made no significant difference to strength (TDS).[4]
What a tamper does
A tamper presses loose grounds into a firm, flat puck so that water meets the same resistance everywhere in the basket. Two things decide whether it does that job: whether the base fills the basket, leaving no loose ring at the edge, and whether you press it down level. A tilted tamp leaves one side of the puck thinner, and water takes the easier path.
This page covers how to get both right, then what the evidence says about force.
Size: match the basket, not the label
Portafilters are named by a nominal size, but a tamper has to slide inside the basket, so the right base is usually a little smaller than the label. Breville's own quick guide for the Barista Express calls its built-in tamper 54 mm,[5] while accessory and basket makers size tools for the same baskets at 53 to 53.4 mm. Treat the number on the box as a family name.
| Machine or basket | Tamper size the makers give |
|---|---|
| Breville 54 mm machines (Bambino, Barista Express, Pro, Touch) | 53.3 mm from Normcore[1]; 53 to 53.4 mm for IMS's Breville basket[6] |
| De'Longhi manual machines | 51 mm, De'Longhi's own tamper[7] |
| VST 58 mm-class baskets | 58.40 mm[3] |
| IMS 58 mm baskets | 58 to 58.4 mm[2] |
| Profitec PRO 400 | 58.4 mm, per Profitec's manual[8] |
| Flair 58 | 58.4 mm best, 58.5 mm at most[9] |
| Lelit Anna | LELIT57-specific tools; Lelit gives no diameter[10] |
| Flair PRO 2 | 45.5 mm[11] |
| Cafelat Robot | About 57.4 mm, Cafelat's own tamper,[12] for a basket 57.8 mm across inside[13] |
The 58.5 mm question has no single answer. Normcore lists a 58.5 mm tamper for a long list of 58 mm machines, from the Gaggia Classic to the Rancilio Silvia.[1] Decent Espresso, which uses a 58.35 mm base, advises against 58.5 mm because a very close fit can lift the puck.[14] When sources disagree, go by your basket maker's figure. The machine size finder shows the sourced sizes for your model, and 58 vs 58.5 mm tampers covers the trade-off.
Force: consistency beats a number
Socratic Coffee tamped 10 shots at each of 5, 10, 15 and 20 kg and found no significant difference in TDS across the range (p = 0.40).[4] The brew weight, not the tamp, drove the differences it did see. Decent Espresso, a tamper maker, says grounds are fully compressed at about 15 lb.[14]
Machine makers' advice sits in the same range. Breville's Barista Express guide says to tamp with 15 kilos of pressure,[5] and Profitec's PRO 400 manual says about 20 kg.[8] So pick a firm press you can repeat, keep the tamper level, and stop when the coffee stops giving. How hard to tamp goes through the evidence.
Types of tamper
- Plain tamper. A flat base on a handle. You control both the force and the level.
- Calibrated (spring-loaded) tamper. A spring in the handle compresses until it reaches a set force, so every tamp ends at the same pressure. Some designs add a collar that rests on the basket rim to hold the base level. The number on the spring is a choice, not a standard: Normcore ships its V4 tamper with 15, 25 and 30 lb springs.[15]
- Impact tamper. A spring mechanism delivers a set final push at the end of the press. Same goal, different feel; see calibrated, spring and impact tampers.
- Tamping station or mat. Not a tamper, but it holds the portafilter steady and level while you press, and protects the counter.
How to choose
- Find your tool size in the table above or in the basket size guide. If you have fitted an aftermarket basket, its maker's figure wins.
- Decide whether you want repeatability built in. If your shots vary and you suspect the tamp, a calibrated tamper removes one variable. If they do not, a plain tamper of the right size is enough.
- Choose a flat base unless you have a reason not to. VST, for example, gives its 58.40 mm figure for a flat tamper.[3]
- Order the right size. Some tamper listings, including two on our tamper shortlist, sell several base sizes under one item; each Normcore tamper we link is a single size.
Picks that fit3 products
Choose the V4 53.3 mm for Breville's Bambino, Barista Express, Pro and Touch (Normcore's own size for them), the V4 58.5 mm only if your 58 mm basket allows 58.5 mm, and the 51 mm for De'Longhi, where the fit is the listing's claim because Normcore's guide has no De'Longhi rows.
More on choosing
On Amazon, check that 'Ships from / Sold by' shows Amazon.com or Normcore before you buy.
Everything in this topic
Guides
- 58 mm, 58.4 mm or 58.5 mm tamper?Explains why sources disagree on tamper sizes for 58 mm machines and gives you a rule for choosing yours from your basket's own specification.
- Calibrated, spring-loaded or impact tamper?Helps you choose a tamper type by what it actually controls, so you pay for consistency and fit rather than for a force number.
- How hard should you tamp espresso?Explains what published measurements say about tamping force, so you can stop worrying about a number and focus on what changes the shot.
- Espresso basket and tamper size guideTells you the accessory sizes that fit your machine, with the source for each number, so you order the right variant the first time.
Shortlists
- A 58 mm espresso workflow kitShows which accessories form a coherent 58 mm set, what each step does, and what the listings do not prove.
- Best espresso tampers for 51, 54 and 58 mm basketsNames the exact tamper variant to order for your machine family, with each size checked against what basket and machine makers publish.
Product research
- ALIKISSCAFE 30 lb calibrated tamper: research notesSeparates the listing's claims from what is known, and shows which variant matches your basket.
Tools
- Espresso machine size finderGives the sourced accessory sizes for your exact machine model, so you order the right variant the first time.
Common questions
Is a 58.5 mm tamper better than a 58 mm one?
Not automatically. A closer fit leaves a thinner untamped edge, but VST, IMS, Flair and Profitec's PRO 400 manual all specify 58.4 mm, and Decent advises against 58.5 mm because a very close fit can lift the puck. More in 58 mm, 58.4 mm or 58.5 mm tamper?
Will a 58 mm tamper work in a 58 mm portafilter?
Yes. It is smaller than the 58.4 mm that basket makers specify, so it fits, and Rocket and Gaggia sell 58 mm tampers for their own machines. The trade-off is a slightly wider ring of untamped coffee at the edge. More in 58 mm, 58.4 mm or 58.5 mm tamper?
What size tamper fits a Breville Dual Boiler?
Its portafilter is 58 mm, and IMS serves it with B70 baskets that list a 58/58.4 mm tamper. Normcore lists 58.5 mm for it. Go by the basket you actually use. More in 58 mm, 58.4 mm or 58.5 mm tamper?
Why does Profitec list two different tamper sizes?
Its PRO 400 & JUMP manual recommends a 58.4 mm tamper, but its 58.5 mm walnut tamper is marketed for the JUMP among other machines. We report both; for those two machines the manual is the more specific document. More in 58 mm, 58.4 mm or 58.5 mm tamper?
Does the same rule apply to puck screens?
Mostly. A screen sits on the tamped puck and must drop in and lift out without binding. Normcore lists 58.5 mm screens for most 58 mm machines, so check that yours lies flat in your basket. More in 58 mm, 58.4 mm or 58.5 mm tamper?
Is a calibrated tamper worth it?
Worth it for consistency, not for the number. In Socratic Coffee's controlled test, tamps from 5 to 20 kg gave no difference in extraction (TDS), so the benefit is that each tamp matches the last. More in Calibrated, spring-loaded or impact tamper?
Which spring weight should I use in a spring-loaded tamper?
There is no proven best. Normcore ships its V4 with 15, 25 and 30 lb springs, Decent says coffee is fully compressed at about 15 lb, and Breville tells Barista Express owners to tamp with 15 kg. Pick one and keep it. More in Calibrated, spring-loaded or impact tamper?
What is an impact tamper?
A tamper with a spring mechanism that adds a quick final press at the end of the stroke. MHW-3BOMBER and IKAPE both sell them. We found no independent measurement comparing an impact press with a steady one. More in Calibrated, spring-loaded or impact tamper?
Questions
What size tamper fits a Breville Barista Express or Bambino?
About 53.3 mm, even though Breville calls the portafilter 54 mm. Normcore lists a 53.3 mm tamper for the Barista Express, Pro, Touch, Bambino and Bambino Plus, and IMS gives 53 to 53.4 mm for its Breville basket. See Breville 54 mm machines.[1][6]
Should I buy a 58 mm or a 58.5 mm tamper?
Go by your basket. VST specifies 58.40 mm for its baskets, IMS 58 to 58.4 mm, and Flair calls 58.5 mm the largest size for the Flair 58. Normcore lists 58.5 mm for many 58 mm machines, but Decent Espresso advises against it because a very close fit can lift the puck.[3][2][9][1][14]
How hard should I tamp espresso?
Firmly and level, until the coffee stops compressing. Socratic Coffee found no significant TDS difference between tamps of 5, 10, 15 and 20 kg, so a press you can repeat matters more than a target number. More in how hard to tamp.[4]
Is a calibrated tamper worth it?
Only if you want one variable fixed. A spring tamper makes every tamp end at the same force; there is no evidence that the force itself improves extraction. The number is a convention: Normcore offers 15, 25 and 30 lb springs for the same tamper.[15][4]
Will a 51 mm tamper fit my De'Longhi Dedica?
De'Longhi says its 51 mm DLSC080 tamper fits all its manual espresso machine portafilters. If you have swapped in an aftermarket basket, use that basket maker's tamper size instead.[7]