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The Key

83mm Conical Burr Electric Grinder
Regular price $2,139 USD $
Regular price USD Sale price $2,139 USD
Color | Snow Finished in Snow


The original KEY integrated an 83mm conical burr set into the most compact, space-saving design possible. 

The Mk.2 marks an evolutionary step in the development of the KEY by introducing significant usability and workflow upgrades while maintaining the same footprint as the original version.

The burrs and mount define the width of the Key, so it takes up a fraction of the space required by grinders with burrs only a fraction of the size.


Availability & Delivery

The KEY (Snow) is available for immediate worldwide delivery.

The KEY (Onyx) is available for immediate worldwide delivery.

Note: US orders now ship from our Colorado warehouse. No long waits, no surprise duties.

EU now ship from our Hamburg (Germany) warehouse. We covered the duty into the EU.

Asia/Rest of World ship direct from Taipei. Duty may be incurred depending on your country of residence.

Key Features

Created by the engineers and designers behind the iPod nano, we took great care to pack a lot into a small package.

  • Built-in Cleaning Brush with Replaceable Head
  • Easy RPM Adjustment Knob
  • 5 micron stepped adjustment
  • Compatible with both Standard (49mm & 58mm) and Magic (58mm) Tumbler Configurations
  • Magnetic Tumbler Centering on Hardwood Landing Pad
  • Tumbler configurations are interchangeable with our HG-2 Hand Grinder

83mm Burrs

The KEY is built around the massive 83mm conical burr set. We source our burrs exclusively from Mazzer, but apply our own unique secondary processes to partially season them so they are usable out of the box, and then seal in the edge with a life-prolonging and completely food safe TiN coating. Perfect for the single-dosing café or home.

Items Included

Every KEY Mk.II Grinder ships with the following in the box:

  • KEY Grinder Main Unit (SNOW or ONYX
  • No fuss plug-in-anywhere-in-the-world (90-240v) C13-type power cable (US, AU, EU, UK styles only). 
  • Magic Tumbler (Patented, fits 58mm). Standard Tumbler (fits 49mm & 58mm) + Funnel sold separately.
  • Air blower bellows for cleaning
  • RDT Bottle
  • Stainless Dosing Cup
  • Hex wrenches for assembly and maintenance

Recommended Pairings

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KEY Travel Case

Regular price $200
Regular price Sale price $200 USD
Custom briefcase to safely bring your KEY along

Magic Tumbler Lid

Regular price $32
Regular price Sale price $32 USD
Turn the Magic Tumbler into a Magic Shaker

KEY Custom Wood Accents

Regular price $75
Regular price Sale price $75 USD
Teak or Walnut accents, user-swappable.

Traditional Workflow Funnel & Tumbler

Regular price $85
Regular price Sale price $85 USD
Made for KEY, alternative workflow setup


Regular price $320
Regular price Sale price $320 USD
The ultimate in freshly roasted bean storage, with proprietary 1-way freshness valve.
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See KEY in Action

The Key's burrs and mount define its width, giving it the punch of Goliath with the footprint of David. That makes the Key the most precise, repeatable, and cleanable conical grinder in the world.


50% Increased Torque

50% Increased Torque

The Mk. II boasts a massive 50% increase in torque from its predecessor, achieved through a combination of a new gearing system and higher current power supply. The Mk. II can effortlessly grind through extremely light roasts and even green coffee, though we don't recommend it, at fine settings, and at the lowest RPM (30 RPM).

Magnetic Dust Cover

Magnetic Dust Cover

A redesigned, knurled cover sits atop a 30% larger loading chamber, with a ~40g capacity. The cover is made up of two sides that can lift apart, or be magnetically held above the loading chamber while beans are added. Once loaded, the cover easily drops back down into place to prevent any coffee fragments from bouncing out.

Customizable Wood Accents

Customizable Wood Accents

The Key Mk. II's wooden platen and brush handle are now customizable. The Mk. II ships with Oak wood accents, but the accents can easily be replaced for Walnut or Teak to match near any interior design.

Integrated Bean Feeder

Integrated Bean Feeder

The Bean Feeder mechanism is now integral to the design, ensuring even loading rates throughout the grind, critical for perfect single-dosing. The mechanism now houses a bottom bearing to maintain factory alignment without needing adjustments.

Updated Magic Tumbler™

Updated Magic Tumbler™

We've updated the Magic Tumbler for the Key Mk.II. The updated design features anti-static plates, and an additional, replaceable paper wiper to ensure minimal grind retention, well below 0.1g. In tests, we've found retention to be below the range most coffee scales are capable of measuring.

Thoughtful Details

83mm Mazzer Conical Burrs

83mm Mazzer burrs, factory pre-aligned. We partially pre-season them and lock in the longevity with a food-safe TiN coating. Rated for 5,000Kg, or several lifetimes of delicious coffee.

Technical Specifications & Details


Dimensions & Specs

Dimensions & Weight (Product)
248mm x 109.2mm x 349.6mm, 9Kg
(9.76″ x 4.30″ x 13.76″) 

Dimensions & Weight (Shipping Box)
41 x 61 x 24cm, 14Kg

Input Voltage
90-240V (Globally compatible)

350W Max

Power Connector
C13 Adapter - Compatible with any plug type
(Ships with compatible plug for your country as available)

Dimensions & Specs

Magic Tumbler Wiper Installation

The Key with Magic Tumbler will arrive with the Magic Tumbler installed, but not the integrated Weiss Distribution Technique (WDT) wiper. We've put together the following video to help with installation. You'll need the included 5mm Hex Key included in the box, the included stainless steel retaining washer, the wiper itself, and a bit less than 5 minutes.

Dimensions & Specs

Maintenance and Cleaning

The KEY has been designed from the start to be both simple and easy to clean. No tools, and a full clean in seconds, not hours.

The upper funnel can be lifted away to reveal the top of the burr set. A few strokes with the brush that's always ready to deploy removes any stray coffee grounds. The lower funnel is held in place by 12 strong rare earth magnets and can be removed with a simple twist of the wrist. Once exposed, the lower burrs can be brushed clean in seconds.

We believe that a good product is a clean product, and designing them to be easy to clean is fundamental to improving the quality of your coffee and the hygiene of your countertop. 

Dimensions & Specs

Key Workflow

Daily use, workflow, cleaning, and maintenance of the KEY Coffee Grinder.

Dimensions & Specs

KEY User Manual

The PDF for the KEY QuickStart user manual can be dowloaded here.

The full KEY manual can be downloaded here.

Dimensions & Specs