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General Foundry Service

Small to large aluminum and zinc castings with affordable tooling and fast turn parts that are machined complete to print


ISO 9001 | ITAR


San Leandro, CA

Mountains in Clouds
White Waves

Why General Foundry Service?

With five complementary casting processes, General Foundry Service has the right process for your parts based on part size, annual volume, and tolerance requirements.


General Foundry Service has over 70 years of experience providing a comprehensive range of prototyping, pre-production, and short-run production services. General Foundry manufactures custom aluminum and zinc aluminum castings from five casting processes: green sand casting, no-bake sand casting, permanent mold casting, rubber plaster mold casting, and lost wax investment casting. General Foundry has the best methods for prototyping die castings and is cost-effective for low to medium volume castings - from thumbnail size up to 500 pounds.

Precision aluminum sand castings offer good surface finish, design flexibility, and economical tooling for larger parts. No-Bake (Airset) sand casting is a good option for producing larger castings up to 64” x 64” x 18” in size and ranging from 40 to 225 pounds. Permanent Mold castings are an economical alternative to die castings for low to medium volume production.

The rubber plaster mold (R/PM) process offers a combination of low cost tooling, short lead times, and excellent casting detail. R/PM castings are good for die casting prototypes and low to medium volume production. Lost wax investment casting provides more design freedom with thin walls, tight ‘as cast’ tolerances and the best ‘as cast’ details possible.

General Foundry Service has years of experience in making patterns to exacting tolerances in wood, plastic, or metal. They can create patterns in plastic or metal, using your CAD generated data through CNC machining or StereoLithography.

Value added services include:

  • Machining

  • Surface finishing

  • Powder coating, painting, and plating

  • Testing

  • Assembly

Natural Cosmetics Oil

Aluminum Alloys: 

  • 200 series, 356, 357, 535

Zinc Aluminum Alloys: 

  • ZA8 and ZA12

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