ADR SAS

France

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ADR SAS (ADR Alcen) is a high-precision mechanical engineering firm and manufacturer specializing in custom, ultra-precise ball bearings and complex rotating subsystems. Founded in 1925 and located in Thomery near Fontainebleau, ADR is a subsidiary of the French technology group ALCEN.

Operating dedicated precision grinding workshops and over 1,200 m² of certified cleanroom assembly environments, ADR holds EN 9100 / ISO 9001 aerospace certifications and delivers motion control solutions for extreme operating environments requiring minimal torque and high dimensional stability.

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ADR designs and manufactures tailor-made miniature and precision mechanical motion assemblies:

High-Precision Ball Bearings: Deep groove, thin-section, and angular contact ball bearings manufactured with bore diameters ranging from 1 mm up to 330 mm outer diameter.
Integrated Ball Bearings: Bearings engineered directly with functional mechanical interfaces, custom flanges, integrated gearings, or specialized preload architectures.
Advanced Rotating Subsystems: Gyrostabilized platforms, optical scanning and tracking assemblies, optronic sights, infrared pointers, and encoder-integrated spindles.
Servomotors & Motorized Bearings: Direct-drive frameless torque motors, brushless motors, and precision electro-mechanical actuators with zero-backlash motion.
Specialized Testing & Clean Assembly: Vacuum-compatible lubrication, cleanroom assembly class ISO 5 to ISO 7, metrological verification, and torque measurement down to micronewton-meters.

ADR SAS

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