Representing "preferred manufacturing" services to customers in advanced industries including: aerospace, DOD, medical, semi-conductor, solar, scientific instrument, transportation, and commercial. 

St. John Associates is a California based independent sales organization.  With over 35 years experience in manufacturing technologies, our network of associates offers assistance in areas of sourcing, process recommendation, and new technologies to meet your quality/cost management objectives.

Our strong customer relationships are built on trust and confidence; "we do what we say", no shortcuts, just hard work.  Our predictable growth and equity is determined by the success of our long term relationships with our customer base.  With continuing focus on opportunities to improve value, we remain agile and intuitive to help meet current and future market requirements.

ST. JOHN ASSOCIATES  |  PO Box 323  |  Diablo, CA  |  USA  |  94528  |  (925) 984-4677  |  jay@preferredmfg.com

Primary Processes & Services:

Cast Metals

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Die Casting
Aluminum and Zinc Alloys
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Investment Casting
Ferrous, Non-Ferrous,
and Vacuum Melt Alloys

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Precision Sand
Ferrous and Non-Ferrous Alloys
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Permanent Mold
Aluminum Alloys

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No-Bake Sand
 Ferrous and Non-Ferrous Alloys
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Shell Mold
Ferrous Alloys
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Rubber Plaster Mold
Aluminum and Zinc Alloys

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Rapid Prototype
Ferrous and Non-Ferrous Alloys
Fabrication
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Forging
Open and Closed Die

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Stamping
High Volume Capabilities
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Welding
MIG, TIG, and Electron Beam
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Assembly
Power Supply, Control Panel,
and Sub-Component

Machining

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CNC Vertical Milling
3 & 4 Axis
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CNC Horizontal Milling
3 & 4 Axis
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CNC 5 Axis Milling
Large Envelope Capabilities
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CNC Turning
Live Tooling & VTL
Post Process Finishing
Advanced coatings, plating, anodizing, electropolishing, and mechanical finishes.

St. John Associates offers product development assistance in the following areas:

  • Feasibility
  • Process Selection
  • Design for Manufacturability
  • Rapid Prototyping
  • Tooling Design

We have a comprehensive understanding of purchased cost management through engineered improvement programs to assist with the competitive challenges of today's market.

For questions and new project inquiries please contact:
 Jay St. John
(925) 984-4677

We are proud members of the following organizations:

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