The SDx™ Series

Production-scale milling platform

Innovative size reduction and milling technology, combining multiple powder processing solutions on one platform.

The SDx Series

Production-scale milling & screening

Introducing our next-generation innovation in powder processing and size reduction. The world's most advanced production-scale milling & screening platform offering three distinct processing solutions on a single, common drive.

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The SDx Series affords the ability to easily transfer between production-scale Quadro®Comil®, FlexSift security screening, and Fitzpatrick hammer milling.  Thanks to SMARTdetect technology, head recognition and RPM range adjustments are made automatically, enabling you to change heads in seconds, thereby improving production efficiency. 

Rest assured that results achieved with your current equipment will not only be replicated, but enhanced with the new SDx Series.

Offering the best value for your processing investment – three functionalities on one platform, providing the lowest long-term cost of ownership when compared to the purchase of individual units.

The Range

Conical Milling

U20x Comil®

Conical Milling

High-Performance Conical Milling

  • Greaseless gearbox minimizes the risk of contamination and lowers operating temperature.
  • Improved particle size distributions (PSDs) with 20-40% more on-target.
  • Available with new, high-efficiency screens for up to 50% average capacity increase (patent pending).
  • Compatible with Classic U20 screens & impellers to save on tooling requirements.
  • Results achieved with the Classic U20 are replicated and enhanced with the new & improved U20x.

Features at a glance

CAPACITIES up to 3,000 kg/hr*
PSD d50 5.6 kW (7.5 HP)
PSD d90 <75 dB

*Capacity dependent upon the product, PSD target & set-up. 


S20x FlexSift

Delumping & Screening

In-line security screening.

  • Optimizes security screening; one unit replaces 3 – 7 traditional vibratory sifters while achieving similar capacities.
  • Best-in-class performance with 40%–50% more capacity vs. similar technologies.
  • Largest capacity range of any centrifugal security screener in the market.
  • Greaseless gearbox eliminates the risk of contamination.

Features at a glance

CAPACITIES up to 20,000 kg/hr*
PSD d5020-150 µm 5.6 kW (7.5 HP)
PSD d90 <75 dB

*Capacity dependent upon product, PSD target & set-up..

D6Ax FitzMill

D6Ax FitzMill

Hammer Milling

Superior particle size reduction.

  • Guarantees full cleanability with a 4-piece chamber enabling complete disassembly, and assuring 100% cleaning verification.
  • The standard for APIs and difficult products with an unmatched selection of screens (from 50 μm).
  • Cooling infeed chamber available for heat-sensitive products.

Features at a glance

CAPACITIES up to 3,000 kg/hr*
MESH SIZE min 5.6 kW (7.5 HP) µm 
MESH SIZE max <80 dB

*Capacity dependent upon the product, PSD target & set-up.

In detail

SDx™ Series - production capacity milling

Introducing the SDx™ Series - one platform, 3 solutions.

As well as fulfilling cGMP requirements, we strive to ensure that the machines we develop are well-designed and safe for the user and therefore, we adhere to a variety of specific industry directives.

All Quadro products are designed and manufactured in a facility with an ISO 9001:2015 accredited Quality Management System. 

The scope of this Quality Management System applies to all processes and activities which are controlled, managed, and executed by employees within Quadro Engineering. 

The current Certificate of Registration, reference Certificate No: CERT-0123529, was issued by SAI Global and is effective until September 2, 2024.


We offer a complete selection of ATEX-approved mills that meet the ATEX European Union directive for products used in potentially explosive atmospheres.

Our equipment is designed to handle the toughest milling applications, which is why professionals around the world choose Quadro.   With models specifically designed to meet ATEX Zone 0,20 (1GD)  or 1/21 (2GD) requirements, we provide the most comprehensively safe mills in the industry.


All equipment destined for Europe is CE-designated and comes with an EU Declaration of Conformity or EU Declaration of Incorporation.   Equipment is certified to comply with the Machinery Directive 2006/42/EC,  the Low Voltage Directive 2014/35/EU and the Electromagnetic Compatibility Directive 2014/30/EU.

Our equipment is designed to meet a variety of international safety standards, ensuring that whichever country you are in, we can certify compliancy.

Discover why Quadro has become the manufacturer of choice to fulfill multiple materials sizing requirements across a range of applications.

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We offer a wide range of solutions that provide reliable and repeatable results.

When you invest in Quadro® Powder Processing and Milling Technology you get more than just superior engineering and quality, you get access to our team of experts who will ensure you achieve your objectives.


Achieve tight particle size distributions in a variety of applications with the right mill. 


Get faster, more efficient deagglomeration without particle damage.

Fine Grinding

Achieve elevated on-target particle sizes with just one complete station.

Security Screening

Avoid contamination by ensuring powder is free of foreign materials and/or impurities.

Hammer Milling

Within our IDEX platform, The Fitzpatrick Company provides hammer milling expertise.