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Our manufacturing process

MetallBall manufactures, thanks to its own production tools, high precision steel, stainless steel and ceramic balls.  Blanks are made by cold heading, we hold in our tool pool 5 heading machines (Ø 1mm to 16mm). The following step of hard grinding allows us to phase out the flange and the 2 poles made by the heading.

The semi-finished balls are then sent out to subcontractor for thermal treatment. This is the only subcontracted process to certify conformity to NADQAP. The ceramic blanks are supplied by manufacturers certified Class 1 ASTM F2094.

The semi-finished balls (steel or ceramic) go through the successive steps of grinding and finishing to meet with Grade 5 or 10.

All balls are manufactured on iron casted plates, machined internally with a CNC machine. An extra polishing step, performed in a controlled environment, is necessary to reach Grade 3.

Our production is managed by ERP comprising our customer’s orders, purchasing orders and the stock. This system also enables, thanks to the record of real time labor with a bar code function, to post on flat screens installed on each unit of the shop floor, a dynamic production planning.


Our checking equipment

Our specialized laboratory is a key element to our quality, the working environment is controlled to guarantee measurement accuracy (temperature, hygrometry, overshoes  are compulsory) and is organized according to 5S. The diameters and variation in diameters are measured by comparison to a standard ball under laminar flow cabinet (Class 100) to ensure precision at 1/10µm. The roundness and roughness inspection tools are gauged on a weekly basis to match with the most accurate value such as Grade 3. The surface of the balls is inspected under a microscope equipped with a numeric camera.

The second key to success is our ball material inspection. The analysis of the chemical composition during our goods-in inspection ensures the basis of our manufacturing process. The Eddy Current and material sorting on steel balls and penetrant inspection on ceramic balls are optional requirements for the most critical fields.

Additionally, for some particular activities where cleanliness is essential, a particle inspection per batch can be performed.



Diameter measurement and diameter variation : 1/10µm , Measurement performed under laminar flow box (Class 100)



Roundness and harmonic profile measurement



Roughness surface “Ra” measurement. “Rt” and “Rsm” measurement on customer request

Eddy Current


Eddy current inspection. Technician qualified COFREND COSAC level 2.

Chemical composition


Chemical composition analysis during wire or ball incoming inspection.

Material sorting


Ball material and hardness sorting

Visual inspection


Visual inspection under magnification  x7 to x40. A microscope can be used for surface analysis under x100.

Particles control


Ball cleanliness evuation by control of particles : gravimetric and grain size analysis

“L’Oréal®” oxidation test


Balls pass our oxidation test to guarantee corrosion resistance (test for cosmectic application)

Fluorescent penetrant inspection


Fluorescent penetrant inspection to guarantee the absence of C-Crack. Test for silicon nitride balls.




Hardness tester used after heat treatment (HV1)

Magnetism level



Magnetism ball level checked on customer request

Découvrez la fabrication & le contrôle des billes 

A technical query, a quote, stock availability? Contact us on  +33(0)5 63 27 77 21 or via our contact form