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Precision Stainless Steel Fabrication & Custom Enclosures - Custom Metal Fabrication Project Portfolio

Pen Manufacturing delivers precision stainless steel fabrication, custom stainless steel enclosures, and CNC machining services for OEMs, design engineers, and procurement teams across the United States. From our AS9100- and ISO 9001-certified facility in Anaheim, California, we fabricate, machine, weld, finish, and assemble custom stainless steel parts in more than a dozen grades — from a first prototype to repeat high-volume production.

When corrosion resistance, strength, and hygiene are non-negotiable, material experience matters. Our team has spent more than three decades fabricating metals for aerospace, medical, food processing, and industrial customers who cannot afford a part that fails. Ready to put that experience to work? Get a Quote and upload your CAD files today.

What Is Stainless Steel Fabrication?

Stainless steel fabrication is the process of cutting, forming, machining, and welding stainless steel sheet, plate, bar, or tube into finished components. Because stainless steel combines high strength with exceptional corrosion resistance, fabricated stainless parts are the standard in food and beverage, medical, aerospace, energy, and marine applications where failure is not an option.

At Pen Manufacturing, every step happens under one roof. That single-source approach keeps tolerances tight between operations, shortens lead times, and gives you one accountable partner instead of three.

Custom Stainless Steel Enclosures

Stainless steel enclosures protect sensitive equipment in environments that would destroy lesser materials: washdown zones on food processing lines, sterilization areas in medical facilities, corrosive coastal and outdoor installations, and high-heat industrial settings.

We build custom stainless steel enclosures, housings, cabinets, and panels to your exact specifications — typically in 304/304L for sanitary applications, or 316/316L where chlorides and aggressive cleaning chemicals are present. Continuous welded seams, clean cosmetic finishes, and accurate hardware placement come standard, whether you need one enclosure or a thousand.

Frequently Asked Questions

304 is the most widely used stainless grade, offering excellent corrosion resistance for food, sanitary, and general industrial applications. 316 adds molybdenum, which significantly improves resistance to chlorides, salt, and aggressive chemicals — making it the better choice for marine, petroleum refining, and harsh chemical environments. 316 costs more, so specify it only when conditions demand it.

Yes. We fabricate custom stainless steel enclosures, housings, cabinets, and panels for washdown, sanitary, corrosive, and outdoor environments — typically in 304/304L or 316/316L. Continuous welded seams, clean cosmetic finishes, and precise hardware placement are standard, and we support everything from a single prototype enclosure to high-volume production.

Yes. Stainless steel machines work well when the process respects the material — it cuts slower than aluminum, generates more heat, and work-hardens if feeds and speeds are wrong. We machine grades like 304, 316, and 17-4 PH with rigid setups and proven parameters, then verify critical dimensions on calibrated Keyence CMM equipment.

304 and 304L are the standard for most food and beverage applications, offering excellent corrosion resistance and easy sanitation. Where equipment faces chlorides or aggressive cleaning chemicals — brines, sanitizing acids, coastal water — 316/316L is the safer specification. Our engineers can review your washdown and chemical exposure to confirm the right grade.

Yes. Prototypes, low-volume runs, and scalable high-volume production all run through the same Anaheim, California facility and the same AS9100/ISO 9001 quality system. Keeping fabrication, machining, welding, finishing, and assembly in-house means your part scales without requalifying new vendors mid-program.

Pen Manufacturing is AS9100 and ISO 9001 certified. Every stainless steel component follows a documented four-step quality process — front-end engineering review, certified fabrication, in-process inspection, and final validation using Keyence CMM and calibrated metrology — meeting the traceability requirements of aerospace, defense, and medical buyers.