Top metal casting foundries in California, ranked by ChatGPT answers

Places ChatGPT showed

• General Foundry Service · Foundry
• Protocast JLC Precision Investment Castings · 4.7★ · Foundry
• California Casting Inc · 4.7★ · Trophy shop
• Fenico Precision Castings · 5.0★ · Foundry
• Decco Castings, Inc. · Foundry
• Thomas Non-Ferrous Alloys Inc · 4.7★ · Aluminum supplier
• American Casting Company · 4.0★ · Foundry
• Alcast MFG Inc. · 3.3★ · Foundry

For an equipment manufacturer doing small production runs, I’d build the California comparison around foundries that explicitly support prototype/low-volume work rather than high-volume die casters. The strongest initial shortlist is:

Foundry	Location	Best fit	Why compare it
General Foundry Service	San Leandro	Aluminum / zinc-aluminum, broad geometries	Particularly compelling for low-to-medium volumes: green sand, no-bake, permanent mold, plaster and investment casting, plus in-house machining and finishing. It specifically markets prototype and low-volume production.
Protocast JLC Precision Investment Castings	Chatsworth	Complex, precision parts in small quantities	Strong investment-casting candidate for aluminum, stainless/carbon/tool steels, copper, nickel and cobalt alloys. It emphasizes prototype and short-run work and has an in-house machine shop.
California Casting Inc	Richmond	Aluminum, brass & bronze sand castings	Good candidate for conventional industrial components where sand tooling economics matter. Its published capabilities include a broad range of aluminum and copper-alloy grades plus engineering and heat-treatment support.
Fenico Precision Castings	Paramount	Precision investment castings	Worth comparing when geometry/detail or alloy flexibility makes investment casting attractive. It handles ferrous and non-ferrous alloys and has a complete lost-wax production flow.
Decco Castings, Inc.	El Cajon	Aluminum sand/permanent mold	Particularly relevant for equipment components in aluminum. It offers both sand and permanent-mold casting, allowing you to compare low-tooling-cost versus more repeatable tooling approaches.
Thomas Non-Ferrous Alloys Inc	Fontana	Short/medium-run aluminum	A potentially good fit if your program is aluminum and you want a smaller, focused supplier rather than a large production operation. It offers sand and permanent-mold casting.
American Casting Company	Hollister	Precision investment casting	Good comparison candidate for smaller, intricate parts. It supports prototype through production investment casting and can use 3D-printed patterns, which can be advantageous before committing to production tooling.
Alcast MFG Inc.	Commerce	Non-ferrous + turnkey machining	Broad process coverage—sand, permanent mold and investment casting—with CNC machining and inspection. Its investment-casting range is reported from roughly ounce-sized parts to 300 lb.

My first three RFQs

For a typical equipment manufacturer, I'd start with General Foundry Service, Protocast JLC, and Decco—but for different reasons:

1. General Foundry Service — best all-around candidate when you don't yet know which casting process will give the lowest total cost. Having five casting processes under one roof makes process comparison easier.
2. Protocast JLC — strongest candidate when the parts are relatively intricate, dimensional accuracy matters, or you're casting steel/stainless/nickel/cobalt alloys.
3. Decco — strong benchmark for aluminum equipment components where conventional sand casting or permanent mold casting is preferable to investment casting.

I'd also put California Casting on the RFQ list if you're dealing with brass/bronze, valves, pumps, fluid-handling hardware or other copper-alloy components. Its published customer base includes pumps, valves, machinery and fluid handling.

What I'd ask each foundry to quote

Don't just ask for a casting price. Give every foundry the same package and request:

• Annual quantity and batch size (e.g. 25, 100, 500 pieces)
• Alloy/specification
• Approximate casting weight and envelope
• 3D model + drawing
• Required dimensional tolerances
• As-cast vs. machined dimensions
• Tooling/pattern cost amortized separately
• Piece price at several quantities
• Tooling lead time and first-article lead time
• Minimum order quantity
• Heat treatment, NDT and inspection capabilities
• CNC machining and finishing options
• Material certification/traceability
• Scrap/rework policy
• Whether they will provide DFM/casting-design feedback

The important economic comparison is total landed cost = tooling + casting + machining + finishing + inspection, not simply the foundry's quoted casting price. Sand casting is often attractive at low volumes because tooling investment is relatively low, while permanent mold and die casting become more compelling as quantities rise.

If you tell me the metal/alloy, approximate part weight, annual quantity, and whether the parts need machining, I can narrow this to the 5 best California suppliers and build a side-by-side RFQ comparison matrix.

Places ChatGPT showed

• General Foundry Service · Foundry
• Protocast JLC Precision Investment Castings · 4.7★ · Foundry
• Pacific Alloy Casting Co., Inc. · 4.6★ · Foundry
• Lodi Iron Works Inc · Foundry
• West Coast Foundry · 5.0★ · Foundry
• Lamar Tool & Die Casting · 4.0★ · Manufacturer
• SKS Die Casting & Machining · 5.0★ · Machine shop
• Alcast MFG Inc. · 3.3★ · Foundry

Yes. I found several California foundries that explicitly combine casting with in-house machining/finish machining, which is useful if you want a single supplier for a cast-to-finished-component workflow.

Foundry	Location	Casting	Machining / finishing	Particularly suited to
General Foundry Service	San Leandro	Aluminum & zinc-aluminum; sand, permanent mold, investment, plaster, 3D-printed sand	16 in-house CNC centers, including 3- and 4-axis machining; surface finishing	Industrial OEM parts, prototypes through intermediate volumes
Protocast JLC Precision Investment Castings	Chatsworth	Investment/lost-wax, ferrous & non-ferrous	Full CNC shop with 4th/5th-axis mills, CNC lathes; finishing & assembly	Pumps, valves, aerospace, defense, medical, industrial components
Pacific Alloy Casting Co., Inc.	South Gate	Iron, ductile iron, abrasion/corrosion/heat-resistant alloys	Finish machining, plus heat treatment and other value-added work	Mining, agriculture, construction, pumps/industrial wear components
Lodi Iron Works Inc	Galt	Iron, ductile iron & steel	CNC turning, vertical milling, CMM inspection	Heavy industrial, infrastructure, oil & gas, agriculture
West Coast Foundry	Vernon	High-alloy iron/steel and corrosion-resistant alloys	Machining of impellers, volutes, bowls, valve bodies, etc.	Pumps, valves, fluid-handling and corrosive-service equipment
Lamar Tool & Die Casting	Modesto	Aluminum & zinc die casting	In-house CNC milling/turning, drilling, tapping, boring; deburring, burnishing, powder coating	Higher-volume industrial and OEM components
SKS Die Casting & Machining	Alameda	Aluminum & zinc die casting	In-house machining and finished-component production, including surface finishes	Production die-cast components
Alcast MFG Inc.	Commerce	Aluminum sand, permanent-mold & investment casting	CNC turning/milling, 4th-axis machining, assembly, powder coating/anodizing	Nonferrous industrial, aerospace/defense components

My strongest candidates

1\. General Foundry Service — best general-purpose option. They are unusually integrated: their San Leandro facility houses the foundry and machine shop, with 16 CNC machines. They explicitly describe supplying fully finished, ready-to-assemble castings and can perform secondary machining, plating, painting and other value-added operations.

2\. Protocast JLC — best for precision investment castings. Their in-house machine shop is specifically set up for secondary machining of their castings, including 4th- and 5th-axis CNC. They offer ferrous and nonferrous investment castings and serve pumps/valves, aerospace, defense, medical and other demanding applications.

3\. Pacific Alloy — best for large/heavy ferrous industrial components. They explicitly describe themselves as a single source for casting design, pattern construction, casting production and finish machining, with casting capacity ranging from ounces up to 12,000 lb.

4\. Lodi Iron Works — strong Northern California choice for iron/steel. Lodi combines its foundry with a machine shop containing CNC lathes, vertical mills, a horizontal mill and Zeiss CMM. Its published capabilities cover iron, ductile iron, steel, stainless, aluminum and bronze machining.

5\. Lamar Tool & Die — strong choice for production aluminum/zinc die castings. It combines die casting, CNC machining and finishing under one roof, with vertical/horizontal machining centers and turning capability. Its industrial customer base includes automotive, agriculture, medical and industrial products.

One caveat: I would not put every California foundry advertising “finishing” into this category. Some only do cleaning, grinding or outsource machining. For example, Pacific Cast Products explicitly describes its machining as light-duty drilling/tapping/machining, whereas the companies above have substantially clearer evidence of production CNC/finish-machining capability.

If you're sourcing industrial components, I can also narrow this to the 10 best California suppliers by material (ductile iron, stainless, aluminum, bronze, etc.), casting process, part weight, annual volume, and CNC tolerance.

Places ChatGPT showed

• A & B Die Casting · 4.0★ · Manufacturer
• American Casting Company · 4.0★ · Foundry
• General Foundry Service · Foundry
• SKS Die Casting & Machining · 5.0★ · Machine shop
• Castem Technology Laboratories, Inc. · 5.0★ · Metal fabricator
• Protocast JLC Precision Investment Castings · 4.7★ · Foundry
• Dynacast Lake Forest, California · 4.8★ · Manufacturer
• Fenico Precision Castings · 5.0★ · Foundry

Yes. I found several California-based casting suppliers that explicitly say they accept customer drawings/CAD and provide engineering or DFM/castability review. The strongest matches are:

Supplier	California location	Casting focus	Drawing/DFM support	My take
A & B Die Casting	Hercules	Aluminum & zinc die casting	Reviews specifications, geometry, DFM, 3D models, tooling and die-fill analysis	Excellent for die castings
American Casting Company	Hollister	Investment casting	Explicit investment-casting DFM; reviews wall thickness, radii, gates, holes, machining stock, tolerances, etc.	Excellent for investment castings
General Foundry Service	San Leandro	Aluminum/zinc: sand, permanent mold, plaster, investment	Works from drawings, reviews datum scheme, machining stock, gating, geometry and design intent	Excellent all-around option
SKS Die Casting & Machining	Alameda	Aluminum & zinc die casting	In-house engineering, DFM, tooling design, design improvements, mold-flow analysis	Strong for production die castings
Castem Technology Laboratories	Irvine	Investment/precision casting + machining	Engineering-oriented; customer drawing/specification review and design collaboration	Good for complex precision parts
Protocast JLC Precision Investment Castings	Chatsworth	Investment casting	Engineering support, early design through production, reverse engineering	Good for precision/complex investment castings
Dynacast Lake Forest	Lake Forest	Zinc & aluminum die casting	Front-end engineering, tooling design and DFM	Best suited to higher-volume precision die casting
Fenico Precision Castings	Paramount	Investment casting	Engineering/manufacturing support	Worth considering for ferrous/nonferrous investment castings

The three I'd contact first

1\. General Foundry Service — San Leandro

This is probably the most interesting option if you're not yet certain which casting process is best. They have five casting processes and explicitly say they get involved early in the design phase, reviewing drawings, datum schemes, machining stock, gating and design intent. They also offer in-house CNC machining.

They accept files with their RFQ, so you can send the actual drawing/CAD rather than trying to describe the part verbally.

2\. American Casting Company — Hollister

If your parts are suitable for investment/lost-wax casting, this is one of the clearest matches to your requirement. They specifically advertise DFM assistance and list the engineering checks they perform: wall thickness, heavy sections, radii, gates, gate witnesses, cast-vs-machined features, holes/slots, ribs, weight reduction, tolerances and post-processing.

3\. A&B Die Casting — Hercules

For aluminum or zinc die casting, A&B is particularly explicit about working with customers before production. Their engineering group performs design review, DFM, prototyping and 3D flow analysis, and can reverse-engineer a part if you don't have drawings.

Another strong die-casting choice: SKS

SKS Die Casting & Machining in Alameda has been doing aluminum/zinc die casting since 1945 and has in-house engineering and tool/die operations. They specifically describe DFM-based development of the die-casting process and machining/finishing procedures around the customer's requirements.

If you tell me your part details

I can narrow this to 5–7 suppliers that are actually a good fit, rather than just companies that offer DFM. The most useful information would be:

• Metal/alloy — aluminum, steel, stainless, zinc, bronze, etc.
• Casting process, if known — sand, investment, die, permanent mold, or “not sure”
• Approximate part size and weight
• Annual quantity
• Whether you need machining after casting
• Your California preference, if any (Bay Area, LA/Orange County, Central Coast, etc.)

If you have a PDF drawing or screenshot of the part, you can also share it and I can help identify which of these suppliers/processes looks most appropriate.

Places ChatGPT showed

• Lodi Iron Works Inc · 5.0★ · Iron works

Yes. I found a useful group of California foundries whose own websites publish enough alloy/process detail to do a first-pass supplier shortlist rather than forcing a buyer to call every shop.

Best-documented California foundries

Foundry	California location	Metals/alloys published	Casting processes published	Shortlist value
Lodi Iron Works Inc	Lodi / Galt	Extensive steel, stainless, cast iron, ductile iron, Meehanite, high-temp and nickel-base alloys; individual grades are listed	Sand, green sand, no-bake/air-set, shell cores	Excellent for ferrous work
Alcast MFG	Commerce	Aluminum, brass/bronze, carbon & low-alloy steel, tool steel, PH alloys, stainless, nickel, cobalt and iron alloys	Green sand, dry/no-bake, permanent mold, low-pressure molding, investment/lost-wax	Excellent for broad alloy/process screening
California Casting, Inc.	Richmond	Aluminum plus extensive brass/bronze grade list	Green sand, no-bake, shell cores, CO₂ cores	Excellent for nonferrous sand casting
Pacific Alloy Casting Co., Inc.	South Gate	Hi-chrome, Ni-Hard, gray and ductile iron, heat-resistant stainless, plus carbon/low-alloy/stainless castings	Green sand and no-bake	Very good for ferrous/high-wear castings
Protocast JLC Precision Investment Castings	Chatsworth	Stainless, carbon steel, aluminum, nickel, cobalt, Inconel and copper alloys	Investment/lost-wax	Very good for precision investment casting
Fenico Precision Castings	Paramount	Carbon/low-alloy steels, tool steels, PH alloys, 300/400 stainless, nickel, cobalt, iron, bronze/copper and aluminum	Investment/lost-wax	Excellent alloy transparency
American Casting Company	Hollister	Particularly detailed superalloy, stainless, CoCrMo, nickel, cobalt and copper-alloy information	Investment/lost-wax; vacuum melting	Excellent for aerospace/medical investment casting
Miller Castings	Whittier	Stainless, aluminum, nickel- and cobalt-based superalloys	Investment casting, including vacuum/air-melt capability	Good, although its public alloy list is less granular

Particularly strong examples

Lodi Iron Works is probably the best example if your objective is “show me the actual grades so I can decide whether to RFQ.” Its casting page lists numerous individual steel and stainless grades—e.g. 4130, 4140, 4340, 304/304L, 316/316L, 17-4PH, 13-4PH—as well as cast irons, ductile irons, Meehanite grades, nickel-base and special alloys. Its process page separately describes green-sand, no-bake/air-set and shell-core operations.

Alcast MFG is unusually useful for cross-process comparison. It explicitly separates its sand/permanent-mold capabilities from investment casting and actually names aluminum grades such as 206, A355, A356, F356, F357, 319, 713 and C355, plus brass/bronze grades.

California Casting has a particularly buyer-friendly capability page: it lists 319, A356, 356, 443, 713 and 850 aluminum, numerous brass/bronze grades, and explicitly identifies green-sand molding, no-bake, shell-core and CO₂-core processes.

For investment casting, Fenico and American Casting stand out. Fenico publishes broad alloy families—including 300/400-series stainless, nickel, cobalt, tool steels, PH alloys, bronze and aluminum—and states that its investment castings range from ounces to about 200 lb. American Casting goes further into specific aerospace/medical materials, including ASTM F75 CoCrMo, Co21/Co25/Co31 cobalt alloys, Inconel 625/718 and copper alloys, along with investment-casting capabilities and vacuum melting.

Protocast JLC is also quite transparent about its material envelope: it explicitly names stainless, carbon steel, aluminum, nickel, cobalt, Inconel and copper-based alloys and explains its lost-wax process.

Finally, Pacific Alloy is worth including when the requirement is predominantly iron/steel rather than general-purpose nonferrous casting. It publishes its emphasis on abrasion-resistant irons, gray/ductile irons and heat-resistant stainless, along with green-sand and no-bake molding and casting sizes from ounces to 5 tons.

My takeaway

If you're building a buyer-facing California foundry directory, I'd classify these roughly as:

Foundry	California location	Metals/alloys published	Casting processes published	Shortlist value
Lodi Iron Works Inc	Lodi / Galt	Extensive steel, stainless, cast iron, ductile iron, Meehanite, high-temp and nickel-base alloys; individual grades are listed	Sand, green sand, no-bake/air-set, shell cores	Excellent for ferrous work
Alcast MFG	Commerce	Aluminum, brass/bronze, carbon & low-alloy steel, tool steel, PH alloys, stainless, nickel, cobalt and iron alloys	Green sand, dry/no-bake, permanent mold, low-pressure molding, investment/lost-wax	Excellent for broad alloy/process screening
California Casting, Inc.	Richmond	Aluminum plus extensive brass/bronze grade list	Green sand, no-bake, shell cores, CO₂ cores	Excellent for nonferrous sand casting
Pacific Alloy Casting Co., Inc.	South Gate	Hi-chrome, Ni-Hard, gray and ductile iron, heat-resistant stainless, plus carbon/low-alloy/stainless castings	Green sand and no-bake	Very good for ferrous/high-wear castings
Protocast JLC Precision Investment Castings	Chatsworth	Stainless, carbon steel, aluminum, nickel, cobalt, Inconel and copper alloys	Investment/lost-wax	Very good for precision investment casting
Fenico Precision Castings	Paramount	Carbon/low-alloy steels, tool steels, PH alloys, 300/400 stainless, nickel, cobalt, iron, bronze/copper and aluminum	Investment/lost-wax	Excellent alloy transparency
American Casting Company	Hollister	Particularly detailed superalloy, stainless, CoCrMo, nickel, cobalt and copper-alloy information	Investment/lost-wax; vacuum melting	Excellent for aerospace/medical investment casting
Miller Castings	Whittier	Stainless, aluminum, nickel- and cobalt-based superalloys	Investment casting, including vacuum/air-melt capability	Good, although its public alloy list is less granular

Lodi Iron Works is probably the best example if your objective is “show me the actual grades so I can decide whether to RFQ.” Its casting page lists numerous individual steel and stainless grades—e.g. 4130, 4140, 4340, 304/304L, 316/316L, 17-4PH, 13-4PH—as well as cast irons, ductile irons, Meehanite grades, nickel-base and special alloys. Its process page separately describes green-sand, no-bake/air-set and shell-core operations.

Alcast MFG is unusually useful for cross-process comparison. It explicitly separates its sand/permanent-mold capabilities from investment casting and actually names aluminum grades such as 206, A355, A356, F356, F357, 319, 713 and C355, plus brass/bronze grades.

California Casting has a particularly buyer-friendly capability page: it lists 319, A356, 356, 443, 713 and 850 aluminum, numerous brass/bronze grades, and explicitly identifies green-sand molding, no-bake, shell-core and CO₂-core processes.

For investment casting, Fenico and American Casting stand out. Fenico publishes broad alloy families—including 300/400-series stainless, nickel, cobalt, tool steels, PH alloys, bronze and aluminum—and states that its investment castings range from ounces to about 200 lb. American Casting goes further into specific aerospace/medical materials, including ASTM F75 CoCrMo, Co21/Co25/Co31 cobalt alloys, Inconel 625/718 and copper alloys, along with investment-casting capabilities and vacuum melting.

• Best alloy/process transparency: Lodi Iron Works, Alcast, California Casting, Fenico
• Best investment-casting transparency: Fenico, American Casting, Protocast JLC
• Best ferrous/high-wear transparency: Lodi Iron Works, Pacific Alloy
• Best aluminum sand/permanent mold transparency: Alcast, California Casting, Decco
• Best aerospace/medical material specificity: American Casting, Miller Castings

One caveat: “publishes an alloy” isn't the same as “currently accepts every job in that alloy.” Furnace size, section thickness, casting weight, certification, minimum lot size and qualification requirements can narrow the practical fit. For RFQ screening, I'd therefore use alloy + process + maximum casting envelope + certifications as the four primary filters.

Places ChatGPT showed

• MESA CASTINGS · Foundry
• West Coast Foundry · 5.0★ · Foundry
• Lodi Iron Works Inc · 5.0★ · Iron works
• Globe Iron Foundry Inc · 5.0★ · Iron works
• Pacific Alloy Casting Co., Inc. · 4.6★ · Foundry
• California Electric Steel Co · 5.0★ · Foundry
• Decco Castings, Inc. · Foundry
• California Casting Inc · 4.7★ · Trophy shop
• Major Brass Foundry · 5.0★ · Foundry
• Fenico Precision Castings · 5.0★ · Foundry

For replacement castings for older industrial equipment, I’d prioritize foundries that explicitly support low-volume work, pattern/tooling, reverse engineering, and machining—not just high-volume production.

California foundries worth contacting

• MESA CASTINGS — San Diego. Strong first call for gray iron and ductile-iron industrial castings. It advertises pattern/tooling support and machining, and specifically serves pumps, valves, industrial equipment, agriculture, mining, and similar applications.
• West Coast Foundry — Vernon/Los Angeles. Particularly attractive for pump, valve, and machinery castings, with gray/ductile iron, carbon and alloy steel, stainless/duplex, bronze and nickel alloys. It also describes low-to-mid-volume work.
• Lodi Iron Works Inc — Lodi. A long-established foundry/machine shop with iron and steel casting, complex cored parts, patterns and machining. Its capabilities include ductile/Meehanite iron and specialty alloys. This is a particularly good candidate for substantial legacy machinery components.
• Globe Iron Foundry Inc — Commerce. Focuses on gray and ductile iron, including prototype/single-piece work through production. Its customer base includes equipment and durable-goods manufacturers, making it a good fit for obsolete machinery castings.
• Pacific Alloy Casting Co., Inc. — South Gate. Worth contacting for gray/ductile iron and abrasion-, corrosion-, or heat-resistant iron castings. Its published capacity ranges from small castings up to roughly 5 tons, useful if the replacement is a substantial machine component.
• California Electric Steel Co — Angels Camp. A strong option when the original part is steel, stainless, or Ni-Resist iron rather than ordinary gray iron. It says it can produce a broad range of ferrous alloys.
• Decco Castings, Inc. — El Cajon. Good candidate for aluminum replacement castings, with sand and permanent-mold casting plus machining/finishing.
• California Casting Inc — Richmond. Specializes in aluminum, brass and bronze sand castings, including industrial, machinery, pumps, valves and fluid-handling applications.
• Major Brass Foundry — Gardena. Worth considering for brass, bronze and aluminum legacy components, especially where the original was a nonferrous sand casting.
• Fenico Precision Castings — Paramount. Best when the old component requires investment/lost-wax casting and relatively high dimensional precision rather than conventional heavy sand casting.

If the original pattern is gone

This is an important distinction. For a one-off or handful of replacements where you have only the worn original part, a conventional foundry may not be the most economical route. Companies using scanning/CAD and patternless or 3D-printed sand molds can reproduce obsolete parts without rebuilding an expensive traditional pattern. California-serving examples advertise this specifically for discontinued industrial components.

What I'd send when requesting quotes

Give each foundry:

• Photos of the casting and overall dimensions/weight
• The original drawing, casting number, or equipment/OEM information if available
• Material/alloy specification, if known
• Quantity needed now and expected annual quantity
• Whether you have the original physical casting
• Critical machined dimensions/tolerances
• Operating conditions—temperature, pressure, corrosion, abrasion, etc.
• Whether you need casting only or casting + heat treatment + machining
• Whether the foundry should reproduce the existing geometry or is allowed to redesign/improve it

For an obsolete part with no drawing or surviving pattern, I'd start with Mesa Castings, Lodi Iron Works, Globe Iron Foundry, and West Coast Foundry for ferrous parts, and Decco or California Casting for aluminum/nonferrous parts. The California Foundry History Institute's directory is also useful for finding additional regional shops, although it cautions that its historical list isn't a complete list of currently operating foundries.

If you tell me what the casting is (e.g., pump casing, gearbox housing, machine frame, impeller), approximate size/weight, and material, I can narrow this to the 5–7 most suitable California suppliers and their contact/quote pages.

Places ChatGPT showed

• Decco Castings, Inc. · Foundry
• Consolidated Precision Products · Foundry
• PCC Structurals · 3.1★ · Metal fabricator
• Miller Castings Inc · 4.1★ · Manufacturer
• Dameron Alloy Foundries · 5.0★ · Manufacturer
• Aurora Casting & Engineering · 5.0★ · Foundry

Yes. If by “material documentation and inspection reports with production orders” you mean things such as material/heat certificates, chemical and mechanical test results, dimensional inspection reports, FAI/AS9102, NDT reports, and Certificates of Conformance (CoC) shipped with the production lot, several California casting companies are strong candidates.

Best California candidates

Company	California location	Casting focus	Documentation strength
Decco Castings, Inc.	El Cajon	Aluminum sand & permanent mold	Excellent — material chemistry/strength certifications, dimensional reports, X-ray/FPI, mechanical testing, AS9100/NADCAP
Consolidated Precision Products (CPP Port Hueneme)	Port Hueneme	Investment casting, aluminum & steel	Excellent — AS9100/ISO 9001, NADCAP heat treat/welding/NDT; formal FAI and inspection documentation
PCC Structurals	San Leandro	Investment casting, steel/nickel/cobalt alloys	Very strong — aerospace-oriented quality and inspection infrastructure
Miller Castings Inc	Whittier	Investment/lost-wax casting	Strong — aerospace/military casting, AS9100/ISO 9001 and NADCAP capabilities
Dameron Alloy Foundries	Cypress	Precision investment casting	Strong — AS9100D/ISO 9001 and aerospace/defense quality requirements
Aurora Casting & Engineering	Santa Paula	Precision investment casting	Strong — AS9100/ISO 9001 and integrated casting/manufacturing

1\. Decco Castings — particularly good for documented production lots

Decco is probably one of the clearest matches if you need the quality paperwork to accompany each production order. Its published quality system says material-strength and chemistry certifications are included in its certification packages, and its dimensional department says it dimensionally checks every lot shipped and provides a report. It can also perform AS9102 first-article layouts.

It also has NADCAP-approved chemical/mechanical testing and NADCAP X-ray and penetrant inspection, which is useful if your PO requires NDT documentation.

Best fit: aluminum aerospace/defense castings where you want material cert + dimensional inspection + NDT/mechanical documentation.

2\. CPP — best for aerospace-grade investment castings

CPP's Port Hueneme operation produces ferrous and non-ferrous investment castings, including aluminum, stainless/steel and nickel-based alloys, and lists AS9100/ISO 9001 and NADCAP certifications.

More importantly, CPP's published purchasing-quality requirements explicitly call for things such as:

• AS9102 First Article Inspection
• 100% inspection reports with actual measured values
• Part number and drawing revision
• Material/process certifications attached to inspection reports
• Inspection reports accompanying deliveries when specified

Best fit: aerospace/defense production orders with formal PO quality clauses.

3\. PCC Structurals

PCC Structurals's San Leandro operation specializes in investment castings in steel, nickel and cobalt alloys and lists ISO 9001 and AS9100 certification. It's a particularly logical candidate for larger or more demanding aerospace investment castings.

4\. Miller Castings

Miller Castings Inc in Whittier is another established lost-wax/investment casting supplier serving aerospace, military and commercial markets. Its quality infrastructure includes AS9100/ISO 9001 and NADCAP special-process capabilities.

What I would put on the PO

If this is for your company's purchasing specification, I would not simply ask for “material certification and inspection report.” I'd specify the exact deliverables, for example:

• Material Test Report / heat certificate identifying the actual melt/heat number
• Chemical composition
• Mechanical properties where applicable
• Heat-treatment certificate
• Dimensional inspection report against the latest drawing revision
• AS9102 FAI/FAIR for first production article, if applicable
• NDT reports: X-ray, FPI/MPI, UT as applicable
• Hardness report where specified
• Process/special-process certifications
• Certificate of Conformance referencing the PO and drawing revision
• Heat/lot traceability from raw material → casting → inspection report
• Nonconformance/deviation documentation for any accepted deviation

My first calls would be Decco and CPP, because their publicly documented quality systems most directly line up with your requirement that the documentation be tied to the production order rather than merely being available on request.

If you tell me what alloy/casting process you need (e.g., 316 stainless investment casting, 17-4 PH, A356 aluminum sand casting, bronze, ductile iron) and approximate part size/annual quantity, I can narrow this to 5–10 California foundries that specifically fit the job, including their certifications and documentation offered with each shipment.

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Places ChatGPT showed

• Protocast JLC Precision Investment Castings · 4.7★ · Foundry
• Castem Technology Laboratories, Inc. · 5.0★ · Metal fabricator
• General Foundry Service · Foundry
• Aurora Casting & Engineering · 5.0★ · Foundry
• American Casting Company · 4.0★ · Foundry
• Supreme Castings & Pattern Co · Foundry
• Decco Castings, Inc. · Foundry

Yes. I found several California foundries that appear particularly well suited to a prototype → first article → repeat/production batch workflow.

Foundry	Location	Best fit	Why it stands out
Protocast JLC Precision Investment Castings	Chatsworth	Investment casting; complex parts	Explicit rapid-prototype investment casting, short-run production, machining and finishing. Its prototype process is designed to avoid permanent tooling early, then transition into production.
Castem Technology Laboratories, Inc.	Irvine	Precision investment casting / MIM	Particularly strong for engineering-driven programs: prototypes, short runs and small-to-large production volumes are advertised, with CT inspection and other quality services.
General Foundry Service	San Leandro	Aluminum/zinc, low-to-intermediate volume	One of the clearest matches. It explicitly describes itself as supporting prototype, low-volume and intermediate-volume production, with sand, permanent-mold, plaster, investment and 3D-printed sand processes.
Aurora Casting & Engineering	Santa Paula	Aerospace investment casting	Handles the project from design/development through production; uses SLA/3D-printed prototypes and says it can move those concepts into production castings without traditional wax-mold costs. It explicitly handles orders from initial prototype through mass production.
American Casting Company	Hollister	Steel/stainless/superalloy investment casting	Strong choice for demanding materials and regulated industries. The company explicitly says it handles prototypes through high-volume production, with AS9100 certification and rapid-production capability.
Supreme Castings & Pattern Co	Anaheim	Aluminum, especially plaster mold	Interesting for programs where you want very small prototype quantities followed by continuing low/medium-volume production. Its tooling approach is designed to support prototypes and repeat production over many years.
Decco Castings, Inc.	El Cajon	Aluminum sand/permanent mold	Particularly good when repeat production and documentation matter. Decco says small runs are readily accommodated, while permanent-mold tooling is used for long-running production jobs; it also performs first-article layouts and lot-by-lot dimensional inspection.

My shortlist

If your goal is specifically "make 1–20 prototypes, validate them, then keep ordering batches of the same casting", I'd start with:

1. General Foundry Service — best general-purpose choice for aluminum/zinc and a broad range of prototype-to-production casting processes.
2. Protocast JLC — very attractive for complex investment-cast parts where rapid prototypes and subsequent production are important.
3. Castem — strong option for highly engineered, small/complex precision parts and a prototype/short-run-to-production progression.
4. Aurora — especially compelling for aerospace/defense-grade investment castings.
5. Decco — particularly worth considering for aluminum parts where you expect sustained repeat production rather than just a few batches.

A useful distinction is casting process. If you're making aluminum housings/brackets in, say, 10–500 pieces per batch, I'd favor General Foundry, Decco, or Supreme. For intricate stainless/steel/nickel parts, I'd lean toward Protocast, Castem, Aurora, or American Casting.

If you give me material, approximate part size/weight, prototype quantity, and expected annual batch size, I can narrow this to the 3–5 best California foundries and compare their likely casting process, tooling approach, certifications, and production-volume fit.

Worked for 8s

1. Searching the web
2. I’ll look for California foundries whose public buyer-facing materials explicitly address tooling ownership, minimum quantities, and lead times—not just generic capabilities.
3. Searching the web
4. Searched 23 websites
5. The clearest match so far is General Foundry Service for published quantity and lead-time guidance; I’m checking whether its tooling ownership is explicit, and looking for California competitors that disclose all three.
6. Searching the web
7. Searching the web
8. Searched 19 websites

Map data is currently unavailable General Foundry ServiceFoundryClosed American Casting Company 4.0FoundryClosed Dameron Alloy Foundries 5.0ManufacturerClosed Protocast JLC Precision Investment Castings 4.7FoundryClosed Pacific Alloy Casting Co., Inc. 4.6FoundryClosed

I found one strong California match and several partial matches, but surprisingly few foundries publish all three commercial points—tooling ownership, minimum order/lot size, and lead time—before an RFQ.

California foundry	Tooling ownership	Minimum order / lot	Lead time	What’s publicly disclosed
General Foundry Service — San Leandro	Partly — publishes tooling/NRE ranges, but I did not find a clear public statement saying the customer owns the tooling	Yes, indirectly — explicitly targets prototype/low-volume work; its published matrix gives quantity ranges by process	Yes — low-volume work can be as little as 4–6 weeks; older process matrix gives more granular sample/production times	Strongest pre-RFQ commercial transparency overall. Its public matrix includes tooling prices, ordering quantities and nominal lead times.
American Casting Company — Hollister	Not found publicly	Not found publicly	Yes — emphasizes extremely short development/production cycles; one industry directory reports 3-week standard reorders, potentially faster	Very transparent on lead-time philosophy, alloys and process, but not MOQ/tool ownership.
Dameron Alloy Foundries — Cypress	Not found publicly	Yes, at quote level — its terms say prices are based on the quoted lot quantity and “minimum quantities cited”	Partly — delivery dates are part of the quotation, but no general lead-time table found	Its sales terms are unusually explicit about lot quantities and delivery-date consequences, but the numbers are established in the quote rather than published beforehand.
Protocast JLC Precision Investment Castings — Chatsworth	Not clearly found	Not clearly found	Yes — current process information gives roughly 2–6 weeks for precision sand-casting first articles and 4–10 weeks for investment-casting first articles	Good process/lead-time disclosure, including tooling-cost ranges and typical production volumes, but ownership/MOQ isn't as explicit.
Pacific Alloy Casting Co., Inc. — South Gate	Not found	Not found	Not found as a numeric public commitment	Publicly describes tooling/pattern services and both high- and low-volume production, but leaves the commercial terms for the RFQ.

The closest fit: General Foundry Service

General Foundry is the one I'd put at the top of a pre-RFQ commercial-transparency list. Its published material tells a buyer that it handles prototype and low-volume production, defines low volume as generally under 1,000 units/month, and publishes lead times as short as 4–6 weeks.

More unusually, its California manufacturing PDF publishes a process-by-process matrix containing typical tooling/NRE costs, ordering quantities, and nominal sample/production lead times. For example, the matrix gives tooling ranges such as $2K–$15K or $10K–$30K for particular processes and distinguishes sample from production timing.

The missing piece is tool ownership: I wouldn't tell a buyer that General Foundry publicly promises customer ownership without getting that term confirmed in writing.

If “customer owns the tooling” is the critical requirement

I found a useful contrast: Engineered Precision Casting Company (EPCO) explicitly says that its tooling is customer-owned and maintained by EPCO, and it says it can accept transfer tooling. It also publishes that it can produce from a few pieces through 1,000+, with a minimum-ship-lot charge, and gives 10–12 weeks for samples with new tooling plus subsequent production lead times. However, EPCO is in Middletown, New Jersey—not California, so it doesn't meet your geographic constraint.

That distinction is important: California foundries tend to publish capabilities and lead times, but customer-owned tooling and hard MOQ/lot rules are often left to the quotation or contract.

If your objective is supplier prequalification, I would therefore treat these as the three questions to put on your screening sheet:

1. Tooling: “Does title to customer-funded patterns/dies/molds transfer to the customer upon payment, and what are the customer's removal/transfer rights?”
2. Minimum: “What is the minimum piece quantity and/or minimum dollar release value per part number?”
3. Lead time: “What are your current tooling, first-article/sample, and repeat-production lead times, measured from which milestone?”

That wording will expose differences that a generic “please quote” request tends to hide.