Pièces et sous-ensembles pour le groupe motopropulseur

Technology integrator

From prototyping to mass production…

Saint Jean Industries has integrated a great deal of expertise since it was founded, making the transition from foundry to miller and now turnkey manufacturer.
In this section you can learn more about its technologies primarily used for engine parts.
Please do not hesitate to contact us regarding alternatives


Saint Jean Industries develops its prototypes in-house with several options according to the quantity of parts to produce.

Cast iron and steel casting: Saint Jean Industries Laval uses shell molding (Croning) as an alternative to sand casting. This process allows the use of any metallurgy, with the advantage of achieving an excellent surface condition and very complex shapes. Our production site has the following technical capabilities:

  • Alloys: Steel, SiMo+, SiMo Chrome, D5S, HK30 (1.4848/1.4849), Z50
  • Max gross dimensions: 800 x 400 x 400 mm
  • Min/max gross weight: 0.2 to 8 kg,

Aluminum sand casting:

  • Alloys: AS7G03-6, AS8U3G, AU5GT, AU5NKZR,
  • Max gross dimensions: 800 x 400 x 400 mm
  • Max gross weight: 50 kg
  • Prototyping, small to large production runs (< 1000 pièces/>n).

Billet machining: our 5-axis UGV machines produce complex parts from any material.

Aluminum casting

Aluminum casting is the historical core business of Saint Jean Industries. Whether gravity or low-pressure casting, these two technologies are available at the majority of the group’s sites. They enable the production of parts:

  • with complex shapes, hollow if necessary via the use of sand cores;
  • with average mechanical properties: Rm = 290 Mpa, Rp0,2 = 210 Mpa, A% = 6%.

All our tooling is designed and manufactured in-house, ensuring we are extremely responsive to your needs.

Gravity die casting: Our light, flexible and automated equipment delivers high production rates ranging from a few hundred to several thousand parts per item.

Low-pressure die casting: These facilities deliver high rates also through the use of multi-die molds thanks to a central supply unit.

EPGS Foundry (DISAMATIC): This innovative manufacturing process is used at the Saint Jean Industries Valladolid site, and allows high production rates to be achieved thanks to the combination of a feed furnace with an electromagnetic pump and a clod moulding system. It is perfectly suitable for embedded parts and with complex shapes.

Cast iron and steel casting

Croning shell molding

The shell molding process is used by Saint Jean Industries Laval to produce cast iron and steel parts.

The advantages of shell molding:

  • The most accurate process using sand: it is possible to locally achieve dimensional tolerances of +/- 0.1 mm and a clearance of 0.5°.
  • Obtains rough parts close to the final shapes, meaning less machining and a reduction in weight.
  • Locally, low-thickness parts: 2.5 +/- 0.5 mm thanks to the excellent surface condition of the shells.
  • Can handle a wide range of materials, cast iron and steel parts can be produced using this process.
  • Modular and flexible production equipment, suitable for medium and large production runs.
  • Low-thickness shells, less sand to recycle.

For more information about this process, please request further documentation:

Machining and assembly

Saint Jean Industries produces complete functions and assembled modules.

Our capabilities

  • Study and production of machining assemblies in-house.
  • Cutting tools designed and produced in-house to optimize cycle times.
  • Dedicated or modular equipment according to parts (example: dual-spindle, 5-axis machines).
  • Completely automated units.
  • Prototype machining, small and large production runs.
  • Organization of production on a lean manufacturing basis.