Top metal casting foundries in California, ranked by ChatGPT answers

Places ChatGPT showed

• General Foundry Service · Foundry
• American Casting Company · 4.0★ · Foundry
• Protocast JLC Precision Investment Castings · 4.7★ · Foundry
• Fenico Precision Castings · 5.0★ · Foundry
• Lancast Aluminum Inc · Foundry
• West Coast Foundry · 5.0★ · Foundry
• Lodi Iron Works Inc · 5.0★ · Iron works
• Castem Technology Laboratories, Inc. · 5.0★ · Metal fabricator

For an equipment manufacturer doing small production runs, I’d compare foundries based on alloy/process fit, minimum economical lot size, tooling strategy, machining capability, and quality requirements—not simply foundry size.

Here’s a practical California shortlist:

Foundry	Location	Particularly worth comparing for	Small-run fit
General Foundry Service	San Leandro	Aluminum/zinc; sand, no-bake, permanent mold, plaster, investment; machining	Strong
American Casting Company	Hollister	Investment castings; aluminum, stainless, steel, copper alloys	Strong
Protocast JLC Precision Investment Castings	Chatsworth	Complex precision investment castings; prototypes and production	Strong
Fenico Precision Castings	Paramount	Investment casting across ferrous/non-ferrous alloys; job-shop work	Strong
Lancast Aluminum Inc	Gardena	Small/medium aluminum parts; green/dry sand and permanent mold	Strong
West Coast Foundry	Vernon	Low-to-mid-volume stainless, steel, bronze, nickel and iron castings	Strong for industrial equipment
Lodi Iron Works Inc	Lodi	Iron, ductile iron, steel/stainless; sand casting + machining	Strong for ferrous equipment components
Castem Technology Laboratories, Inc.	Irvine	Precision investment castings and small complex components	Strong for prototypes/low volume

Where I'd start

For aluminum equipment housings, brackets, covers and similar parts: General Foundry Service and Lancast are particularly relevant. General Foundry explicitly supports prototype, low-volume and intermediate-volume production and offers several casting processes under one roof.

For complex stainless/steel/bronze components: compare Protocast/JLC, Fenico and West Coast Foundry. Fenico describes itself as a job-type investment foundry, casting parts from ounces to roughly 200 lb and handling both ferrous and non-ferrous alloys. West Coast Foundry specifically advertises low-to-mid-volume castings in stainless/duplex, bronze/NAB, nickel alloys, iron and steel.

For iron/ductile-iron machinery components: Lodi Iron Works and Pacific Alloy are worth putting on the RFQ list. Pacific Alloy says it handles low- and high-volume castings from ounces to 5 tons using green-sand and no-bake molding, with machining and heat treating available.

For very small quantities or prototypes: Protocast/JLC and Castem deserve attention because investment casting can avoid some of the tooling economics associated with conventional production tooling. California supplier listings identify both as serving prototype/short-run work.

What I would put in the RFQ

Send each foundry the same representative part or small family of parts and ask for:

• Minimum economical quantity and price at 10 / 25 / 50 / 100 / 500 pieces
• Tooling/pattern cost and expected tooling life
• Recommended casting process and why
• Alloy availability and melt certification
• Expected as-cast dimensional tolerances
• Machining capability and whether machining is in-house
• Heat treatment, NDT, pressure testing and inspection capabilities
• Prototype/first-article lead time versus repeat-order lead time
• Whether they will accept customer-owned tooling
• Annual-volume assumptions needed to reduce piece price
• Quality certifications relevant to your industry
• Packaging and delivery terms

One particularly useful comparison is tooling cost versus piece price. For genuinely small runs, a foundry with a slightly higher casting price can be less expensive overall if it can use inexpensive patterns, 3D-printed tooling/patterns, or an expendable-mold process. General Foundry, for example, offers 3D-printed sand molds alongside conventional sand, permanent-mold, plaster and investment processes.

If you tell me the alloy, approximate part size/weight, annual quantity (e.g. 25, 100, or 500/year), and whether the parts need machining, I can narrow this to a 3–5-foundry RFQ shortlist and compare their processes, certifications, locations, and likely tooling approach.

Places ChatGPT showed

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

Yes. Several California foundries advertise both casting and downstream machining/finishing, which can let you source a near-complete industrial component from one supplier.

Foundry	Location	Casting	Machining / finishing	Typical fit
General Foundry Service	San Leandro	Aluminum & zinc-aluminum; sand, permanent mold, investment and other processes	16 in-house CNC centers, plus finishing	OEM components, low/intermediate-volume industrial parts
Lodi Iron Works Inc	Lodi	Iron, ductile iron, steel, stainless and specialty alloys	CNC machining and inspection	Heavy industrial, pumps, infrastructure, agriculture, oil & gas
West Coast Foundry	Vernon	Stainless, high-alloy and structural castings	Fully machined parts; pump/valve components	Pumps, valves, corrosive-service industrial equipment
Protocast JLC Precision Investment Castings	Chatsworth	Precision investment/lost-wax casting	In-house CNC machining	Complex, tight-tolerance industrial components
SKS Die Casting & Machining	Alameda	Aluminum & zinc die casting	CNC machining plus anodizing, powder coating, plating and other finishes	Higher-volume precision components
Alcast MFG Inc.	Commerce	Aluminum, brass & bronze; sand/permanent mold/investment	CNC machining and inspection	General industrial/OEM cast components
Pacific Alloy Casting Co., Inc.	South Gate	Ferrous, abrasion-/corrosion-/heat-resistant alloys	Machining, painting and other finishing	Mining, cement, agriculture, oil & gas, heavy equipment
Globe Iron Foundry Inc	Commerce	Sand-cast iron, from small parts to ~5-ton castings	Rough and finish machining	Large/heavy industrial components

A few particularly relevant options

General Foundry Service is explicitly set up as a one-stop casting/machining supplier. Its current site says it casts aluminum and zinc-aluminum using five complementary processes and then machines critical features and provides surface finishing. Its machine shop has 16 CNC mills plus a CNC lathe.

Lodi Iron Works is worth considering if your components are iron or steel rather than aluminum. It describes capabilities extending from patternmaking and molding through melting and CNC machining, and lists automotive, infrastructure, defense, aerospace, oil & gas, agriculture and other industrial markets.

West Coast Foundry is particularly oriented toward industrial pump and valve castings. It produces corrosion-resistant/high-alloy castings and explicitly offers fully machined parts.

SKS is a strong option if you're looking specifically for die-cast aluminum/zinc components with secondary machining and cosmetic/functional finishing. It says its finished components can include machining, helicoils/dowel pins, anodizing, powder coating, painting and plating.

If you tell me the material/alloy, approximate part weight or dimensions, annual volume, and industry (e.g. pump/valve, agricultural machinery, construction equipment), I can narrow this to the California suppliers that are the closest technical match.

Places ChatGPT showed

• American Casting Company · 4.0★ · Foundry
• A & B Die Casting · 4.0★ · Manufacturer
• Dynacast Lake Forest, California · 4.8★ · Manufacturer
• Protocast JLC Precision Investment Castings · 4.7★ · Foundry
• Miller Castings · 4.3★ · Machine shop
• Pacific Alloy Casting Co., Inc. · 4.6★ · Foundry
• West Coast Foundry · 5.0★ · Foundry

Yes. I found several California suppliers that explicitly describe accepting customer drawings/CAD and providing engineering or manufacturability review. The best fit depends heavily on whether you're looking for investment casting, sand/permanent-mold casting, or die casting.

California suppliers to consider

• American Casting Company — Hollister, CA
  Particularly strong match for investment casting. They explicitly offer DFM services, foundry-engineer design advice, tolerance review, gating/runner design, and other casting-design assistance. Their site says they can work from customer drawings and help with everything from a simple tolerance review to more extensive design assistance.
• A & B Die Casting — Hercules, CA
  Good option for aluminum and zinc die castings. Their engineering group performs DFM analysis, reviews intended part usage, uses prototyping/flow analysis, and identifies changes needed before production.
• Dynacast Lake Forest, California — Lake Forest, CA
  A substantial zinc and aluminum die-casting operation with engineering, tooling, and design-support capabilities. The local facility is oriented toward engineered production parts and complex die-casting programs.
• Protocast JLC Precision Investment Castings — Chatsworth, CA
  Focuses on precision investment casting with CNC machining and prototyping. It is worth considering if you have a complex geometry and want engineering support from initial design through production.
• Miller Castings — Whittier, CA
  Another investment-casting option. Its engineering approach includes working concurrently with customers during product development to improve castability, reduce cost, and potentially consolidate multiple components into a casting.
• Pacific Alloy Casting Co., Inc. — South Gate, CA
  Better suited to industrial ferrous castings, including gray/ductile and wear-, corrosion-, and heat-resistant alloys. Its services include casting design assistance, tooling, heat treatment, machining, and painting.
• West Coast Foundry — Vernon, CA
  An industrial foundry specializing in custom castings, particularly pump/valve components and corrosion-resistant alloys, with machining and inspection capabilities.

One especially good match

If your requirement is specifically “I have an engineering drawing/CAD model and want the foundry to review it before quoting and tell me what needs to change to make it castable,” I'd put American Casting Company and A&B Die Casting near the top of the initial RFQ list, because their published engineering services explicitly describe that workflow.

For a broader casting process, CPM Industries is also interesting: it says it reviews every part for manufacturability before quoting, accepts drawings/models, and provides both aluminum and steel casting programs with in-house tooling, machining, and inspection.

If you tell me the metal/alloy, approximate part size/weight, annual quantity, and whether you're considering sand, investment, or die casting, I can narrow this to 5–8 California suppliers that specifically fit your part and compare their processes, likely volume range, engineering/DFM support, and locations.

Places ChatGPT showed

• General Foundry Service · Foundry

Yes. If your goal is to shortlist California foundries from their published capabilities before contacting them, several do a particularly good job of exposing both alloys/metals and casting processes.

California foundry	Published metals/alloys	Published casting processes	Location
General Foundry Service	Aluminum, zinc-aluminum	Green sand, no-bake/air-set sand, permanent mold, rubber plaster, investment/lost-wax, 3D-printed sand	San Leandro
Alcast MFG Inc.	Aluminum, brass, bronze and other investment-casting alloys	Sand/dry sand, permanent mold, investment/lost-wax	Commerce
Decco Castings, Inc.	Aluminum alloys	Aluminum sand casting, including dry sand; permanent mold	El Cajon
Pacific Cast Products	Aluminum	Green sand, dry sand/no-bake, permanent mold, permanent tilt mold	Ontario
Performance Aluminum	Aluminum	Green/bonded sand, permanent mold/tilt-pour	Ontario
Protocast JLC Precision Investment Castings	Stainless/carbon steel, aluminum, nickel, cobalt, Inconel, copper-based alloys	Investment/lost-wax	Chatsworth
Fenico Precision Castings	Ferrous and nonferrous alloys, including aluminum and bronze-related alloys	Investment/lost-wax; specialty bi-metal casting	Paramount
American Casting Company	Multiple precision-casting alloys	Investment/lost-wax	Hollister
Aurora Casting & Engineering	Air-melt alloys for aerospace/defense	Investment/lost-wax	Santa Paula

Particularly useful capability pages

General Foundry Service is probably the clearest example of the format you're looking for. Its site explicitly lists five casting processes and identifies aluminum and zinc-aluminum as its material focus. It also describes machining and finishing, making it useful for screening turnkey suppliers.

Pacific Cast Products explicitly publishes its four aluminum processes—permanent mold, permanent tilt mold, dry sand, and green sand—and describes additional post-casting operations.

Fontana Foundry is another unusually straightforward example for aluminum: it publishes aluminum sand, permanent-mold and gravity-die capabilities and gives examples of alloys including 356, A356, A356SR, A328/808 and 713.

Lynwood Pattern Service publishes a useful combination of alloy and process information: 319, 328/808, A356 and 356/F357 aluminum, with dry/no-bake sand, green sand, permanent and semi-permanent mold processes.

For investment casting, Protocast JLC, American Casting, Fenico and Aurora are worth putting on a separate shortlist. Investment casting is used for both ferrous and nonferrous alloys, so alloy compatibility needs to be checked alongside the process.

One additional resource is the Non-Ferrous Founders' Society directory: its California Casting listing, for example, explicitly breaks out aluminum alloy families, copper alloys, and the green-sand process. That's a useful model for a buyer-oriented foundry database.

If you're building a sourcing shortlist

I'd structure the screening fields as:

California foundry	Published metals/alloys	Published casting processes	Location
General Foundry Service	Aluminum, zinc-aluminum	Green sand, no-bake/air-set sand, permanent mold, rubber plaster, investment/lost-wax, 3D-printed sand	San Leandro
Alcast MFG Inc.	Aluminum, brass, bronze and other investment-casting alloys	Sand/dry sand, permanent mold, investment/lost-wax	Commerce
Decco Castings, Inc.	Aluminum alloys	Aluminum sand casting, including dry sand; permanent mold	El Cajon
Pacific Cast Products	Aluminum	Green sand, dry sand/no-bake, permanent mold, permanent tilt mold	Ontario
Performance Aluminum	Aluminum	Green/bonded sand, permanent mold/tilt-pour	Ontario
Protocast JLC Precision Investment Castings	Stainless/carbon steel, aluminum, nickel, cobalt, Inconel, copper-based alloys	Investment/lost-wax	Chatsworth
Fenico Precision Castings	Ferrous and nonferrous alloys, including aluminum and bronze-related alloys	Investment/lost-wax; specialty bi-metal casting	Paramount
American Casting Company	Multiple precision-casting alloys	Investment/lost-wax	Hollister
Aurora Casting & Engineering	Air-melt alloys for aerospace/defense	Investment/lost-wax	Santa Paula

General Foundry Service is probably the clearest example of the format you're looking for. Its site explicitly lists five casting processes and identifies aluminum and zinc-aluminum as its material focus. It also describes machining and finishing, making it useful for screening turnkey suppliers.

Pacific Cast Products explicitly publishes its four aluminum processes—permanent mold, permanent tilt mold, dry sand, and green sand—and describes additional post-casting operations.

Fontana Foundry is another unusually straightforward example for aluminum: it publishes aluminum sand, permanent-mold and gravity-die capabilities and gives examples of alloys including 356, A356, A356SR, A328/808 and 713.

Lynwood Pattern Service publishes a useful combination of alloy and process information: 319, 328/808, A356 and 356/F357 aluminum, with dry/no-bake sand, green sand, permanent and semi-permanent mold processes.

For investment casting, Protocast JLC, American Casting, Fenico and Aurora are worth putting on a separate shortlist. Investment casting is used for both ferrous and nonferrous alloys, so alloy compatibility needs to be checked alongside the process.

One additional resource is the Non-Ferrous Founders' Society directory: its California Casting listing, for example, explicitly breaks out aluminum alloy families, copper alloys, and the green-sand process. That's a useful model for a buyer-oriented foundry database.

• Metal/alloy: aluminum 356, A356, 319, steel, stainless, bronze, brass, nickel, etc.
• Casting process: green sand, no-bake, permanent mold, investment/lost-wax, plaster, die casting, lost foam.
• Typical casting size/weight
• Prototype vs. production quantities
• Core capability
• Heat treatment
• CNC machining
• NDT/inspection
• Surface finishing
• Quality certifications
• Aerospace/defense/ITAR capability, if relevant.

That's substantially more useful than a generic "California foundry" directory because you can eliminate incompatible shops before sending RFQs. The California Foundry History Institute also notes that mold processes vary with metal, production quantity, casting size and complexity, which is why those fields matter.

If you tell me which metals/alloys and casting process(es) you need, I can turn this into a California foundry shortlist with each shop's published alloys, process, casting-size range, certifications, and website, rather than just a general directory.

Places ChatGPT showed

• Lodi Iron Works Inc · 5.0★ · Iron works
• Globe Iron Foundry Inc · 5.0★ · Iron works
• Pacific Alloy Casting Co., Inc. · 4.6★ · Foundry
• West Coast Foundry · 5.0★ · Foundry
• Alcast MFG Inc. · 3.3★ · Foundry
• General Foundry Service · Foundry
• Decco Castings, Inc. · Foundry
• Protocast JLC Precision Investment Castings · 4.7★ · Foundry
• Consolidated Precision Products · Foundry

For replacement castings for older industrial equipment, I’d focus on foundries that can handle low-volume/jobbing work, pattern recreation, and machining, rather than high-volume production-only shops. California has several plausible contacts:

• Lodi Iron Works Inc — Lodi. A particularly relevant option for iron and steel replacement castings. It does pattern/core work, molding, melting and CNC machining in-house, and says it has been producing castings at the same location since 1946.
• Globe Iron Foundry Inc — Commerce. Specializes in gray, ductile and alloyed iron, with capacity from small parts to roughly 5-ton castings. It specifically describes its customers as equipment and durable-goods manufacturers and offers machining/finishing.
• Pacific Alloy Casting Co., Inc. — South Gate. Worth contacting for gray/ductile iron, abrasion- and heat-resistant irons, and stainless castings, including industrial equipment applications. Its stated casting range extends from ounces to about 5 tons.
• West Coast Foundry — Vernon. Particularly relevant if the old component is a pump, valve, impeller, housing, or other corrosion-resistant industrial part. It handles iron, steel, stainless, bronze and nickel/copper alloys and offers machining, inspection and testing.
• Alcast MFG Inc. — Commerce. A candidate for aluminum, brass and bronze replacement castings, with sand/dry-sand and permanent-mold capabilities plus CNC machining.
• General Foundry Service — San Leandro. Focuses on aluminum and zinc-aluminum castings and combines tooling, casting, machining, finishing and inspection; its 3D-printed sand-mold capability can be useful when an original pattern no longer exists.
• Decco Castings, Inc. — El Cajon. A good candidate for aluminum sand or permanent-mold castings, including industrial equipment, with machining and finishing available.
• Protocast JLC Precision Investment Castings — Chatsworth. More appropriate when the replacement is small, geometrically complicated, and requires investment/lost-wax casting rather than conventional sand casting.
• Consolidated Precision Products — Port Hueneme. Investment casting for demanding ferrous and nonferrous applications; potentially appropriate for complex, higher-specification parts rather than straightforward large iron castings.

How I'd approach the RFQ

For an obsolete part, send the foundry as much of the following as you have:

1. Original casting/material — e.g. ASTM A48 gray iron, ductile iron, bronze, A356 aluminum, etc.
2. Photographs of the existing part, including any casting marks or numbers.
3. Dimensions or a drawing; a damaged original can still be useful.
4. Weight and approximate envelope dimensions.
5. Quantity required now and anticipated annual quantity.
6. Whether you need casting only or a fully machined replacement.
7. Any information about the equipment's operating temperature, loads, abrasion, corrosion, or pressure.

If there is no drawing or pattern, specifically ask whether they can reverse-engineer the existing casting and create new tooling, or use 3D scanning/CAD and printed sand molds. That's often the key issue with obsolete machinery.

For one-off or small batches, I'd start with Lodi Iron Works, Globe Iron Foundry, West Coast Foundry, and the appropriate aluminum/nonferrous specialist depending on the material. The distinction between jobbing and production foundries matters here: jobbing operations are specifically oriented toward limited numbers of castings from a design, sometimes just one or two.

If you tell me what the old casting is made of, approximate size/weight, what machine it's from, and how many you need, I can narrow this to a short list of California foundries whose stated capabilities match the part.

Places ChatGPT showed

• Pacific Alloy Casting Co., Inc. · 4.6★ · Foundry

Yes. If by “material documentation and inspection reports with production orders” you mean things such as:

• Material Test Reports / mill certificates tied to the heat or lot
• Chemical composition and mechanical test results
• Heat-number/lot traceability
• Dimensional inspection reports
• CMM reports where applicable
• NDT reports such as X-ray, dye penetrant, or ultrasonic testing
• Heat-treatment records
• Certificate of Conformance
• First Article Inspection / PPAP documentation
• Third-party inspection or witnessed inspection

then there are California foundries worth contacting.

California candidates

• Pacific Alloy Casting Co., Inc. — South Gate, CA. A foundry that may be worth approaching for alloy casting and documentation requirements.
• Protocast JLC Precision Investment Castings — Chatsworth, CA. Particularly relevant if you're looking for precision/investment castings.
• Miller Castings Inc — Whittier, CA.
• Angelus Aluminum Foundries — Los Angeles, CA. Relevant for aluminum castings.
• KenWalt Die Casting Company — Sun Valley, CA. Relevant for die-cast components.
• Kinetic Die Casting Company — North Hollywood, CA.
• Precision Castings & Machining — Santa Ana, CA.

One important caveat: a foundry being capable of casting does not automatically mean it supplies a complete certification package with every production order. I'd put the documentation requirements directly into the RFQ/PO.

For example, specify that each shipment must include heat/lot traceability + material certificate + dimensional inspection report + applicable NDT/heat-treatment reports + Certificate of Conformance, with reports tied to the actual production lot.

For comparison, foundries that explicitly advertise this level of documentation describe heat-number traceability, material certifications, dimensional inspection, and NDT/other test reports as part of their quality systems. California's own Caltrans quality documentation also emphasizes traceability by heat/lot and certified test reports for applicable materials.

If you tell me what material and casting process you need (e.g. 316 stainless investment casting, ductile iron sand casting, aluminum permanent mold, steel investment casting), I can narrow this to 5–10 California foundries that specifically advertise the required MTR/inspection documentation and provide their contact/RFQ information.

Places ChatGPT showed

• Castem Technology Laboratories, Inc. · 5.0★ · Metal fabricator
• General Foundry Service · Foundry
• American Casting Company · 4.0★ · Foundry
• Protocast JLC Precision Investment Castings · 4.7★ · Foundry
• Aurora Casting & Engineering · 5.0★ · Foundry
• McGraw Manufacturing · 5.0★ · Foundry
• Decco Castings, Inc. · Foundry
• KenWalt Die Casting Company · 5.0★ · Manufacturer
• Fenico Precision Castings · 5.0★ · Foundry
• ADC Aerospace · 4.8★ · Manufacturer

Yes. I found several California foundries that explicitly support a prototype → low-volume/short-run → repeat production workflow. The best fit depends heavily on alloy, casting process, part size, and annual quantity.

Foundry	Location	Casting/process	Prototype → repeat production	Notes
Castem Technology Laboratories, Inc.	Irvine	Investment casting; MIM	Yes	Explicitly markets “prototype to production”; supports prototypes, short runs, and larger production volumes.
General Foundry Service	San Leandro	Aluminum/zinc sand, permanent mold, investment, plaster	Yes	Particularly interesting for aluminum: prototype, low-volume and intermediate-volume production, with tooling, machining and finishing.
American Casting Company	Hollister	Investment casting	Yes	Prototype investment castings from CAD, with in-house pattern/prototype capability and production casting.
Protocast JLC Precision Investment Castings	Chatsworth	Investment/lost-wax	Yes	Prototype and production investment castings, with CNC machining and rapid-prototype capability.
Aurora Casting & Engineering	Santa Paula	Investment casting	Yes	Engineering-oriented supplier covering design/prototyping through production, machining, testing and finishing.
McGraw Manufacturing	Anaheim	Aluminum permanent mold; bronze/brass	Yes	Suited to aluminum/non-ferrous parts needing a progression from development to production, with machining/finishing.
Decco Castings, Inc.	El Cajon	Aluminum sand & permanent mold	Yes	Strong fit for aluminum programs requiring repeatable production and quality documentation.
KenWalt Die Casting Company	Sun Valley	Aluminum & zinc die casting	Yes	Prototype die casting plus scalable production tooling and integrated machining/finishing.
Fenico Precision Castings	Paramount	Investment casting	Likely	Commercial investment-casting foundry handling a broad range of ferrous/non-ferrous alloys; worth RFQ confirmation for prototype quantities.
ADC Aerospace	Buena Park	Aluminum/zinc HPDC and related processes	Yes	Turnkey casting, machining, finishing and assembly; more oriented toward production/regulated applications.

The ones I'd investigate first

For a project where you specifically want a few prototypes, validate the design, then keep the same supplier for recurring batches, I'd start with:

1. Castem — especially if the part is small/complex and investment casting is appropriate. Their Irvine operation explicitly describes itself as prototype to production.
2. General Foundry Service — particularly for aluminum, and attractive if you want sand/permanent-mold options rather than only investment casting. They explicitly advertise prototype through intermediate-volume production.
3. Protocast JLC — worth considering for precision investment castings where you want rapid prototypes followed by production.
4. American Casting Company — another strong investment-casting candidate, particularly if you're starting from CAD and need prototype patterns before production tooling.
5. McGraw Manufacturing or Decco — worth investigating for aluminum parts where sand/permanent-mold production makes more economic sense.

One important distinction: “prototype-to-production” doesn't necessarily mean the prototype and production use the identical tooling/process. For example, a foundry may 3D-print or otherwise rapidly make prototype patterns, then move to permanent production tooling once the design is frozen. That's often exactly what you want because it avoids paying for production tooling before the prototype has been validated.

If you give me (1) metal/alloy, (2) approximate part dimensions/weight, (3) prototype quantity, and (4) expected recurring batch size/year, I can narrow this to 3–5 California foundries that are technically and economically plausible, including their process, location, certifications, and published volume ranges.

Places ChatGPT showed

• General Foundry Service · Foundry
• Fenico Precision Castings · 5.0★ · Foundry
• Protocast JLC Precision Investment Castings · 4.7★ · Foundry
• Pacific Alloy Casting Co., Inc. · 4.6★ · Foundry

I found one California foundry with unusually clear public pre-RFQ information covering all three items—tooling ownership, minimum order/lot size, and lead time. A few others publish two of the three and are worth considering.

California foundry	Tooling ownership	Minimum order / lot	Published lead time	What’s public before RFQ?
General Foundry Service — San Leandro	Its published manufacturing guide gives tooling costs and process information, but I did not find an explicit ownership statement.	The guide gives typical quantities by process—for example, `<10`, `<25`, `>500`, `>2,500`, etc.	Depending on process, samples are generally 2–4 weeks and production 3–6 weeks after approval; some processes are longer.	Yes for quantities + lead times; ownership is not explicit.
Fenico Precision Castings — Paramount	I found public process/capability information but not a clear published tooling-ownership policy.	No clear public MOQ located.	No sufficiently specific public schedule located.	Partial.
Protocast JLC Precision Investment Castings — Chatsworth	Public material emphasizes prototype casting/digital pattern approaches, but I didn't find a clear ownership statement.	No fixed public MOQ found.	Public descriptions indicate rapid prototyping, but not a comprehensive standard production lead-time/MOQ/ownership table.	Partial.
Pacific Alloy Casting Co., Inc. — South Gate	Provides pattern/tooling services, but I didn't find a published ownership policy.	Explicitly supports high- and low-volume work, but no numerical MOQ found.	No standard numerical lead time found publicly.	Partial.
West Coast Foundry — Vernon	Its quote page asks whether tooling is existing/being transferred or needs to be built, but doesn't state ownership.	Asks for quantity needed per month, rather than publishing an MOQ.	Asks the buyer for desired lead time.	Good RFQ intake transparency, but not the requested pre-RFQ disclosure.

The strongest match outside California—and useful benchmark

Engineered Precision Casting Company (EPCO) is a particularly good example of the level of transparency you're looking for, although it is not a California foundry. Its FAQ explicitly says:

• tooling is owned by the customer and maintained by EPCO;
• it accepts customer-supplied/transfer tooling;
• there is no fixed casting MOQ—it can supply one part through thousands, using a minimum ship-lot charge;
• new-tooling samples are typically 10–12 weeks;
• production is typically another 10–12 weeks for commercial parts and 12–16 weeks for aerospace/defense.

That makes EPCO a useful model for what a buyer can reasonably expect a foundry to disclose before asking for a quote.

One important California data point

The older published manufacturing guide for General Foundry Service is unusually useful because it lays out typical quantities, tooling cost, and nominal lead time by casting process in one document. For example, it lists tooling ranges such as $2K–$30K or $10K–$30K depending on process, and sample/production schedules ranging from roughly 2–4 weeks / 3–6 weeks to substantially longer investment-casting schedules.

So, if your criterion is strictly:

> “Before I submit an RFQ, does the California foundry publicly tell me who owns the tooling, what its minimum order is, and what lead time to expect?”

I would characterize the public California field I found as surprisingly thin. General Foundry Service gets closest on commercial parameters, while West Coast Foundry is transparent about what information it needs for an RFQ. I did not find a California foundry that publicly spells out all three in the same pre-quote FAQ/page.

If you tell me the casting process (sand, investment/lost-wax, permanent-mold, or die casting), alloy, and approximate annual quantity, I can narrow this to California foundries whose published information actually matches your program.