Custom Metal Fabrication & Precision CNC Machining in San Diego, CA

San Diego OEMs researching a metal fabrication or CNC machining partner often ask the same practical question first: does a manufacturer based near Anaheim actually make sense for a shop in San Diego? Pen Manufacturing has supported OEMs, engineers, and procurement teams across San Diego and the wider Southern California region for more than 40 years with custom metal fabrication, sheet metal fabrication, and precision CNC machining under one roof at its Anaheim location, backed by AS9100D, ISO 9001, NADCAP, and ITAR compliance.

Pen Manufacturing actively serves OEMs and manufacturers throughout San Diego, CA, from its Anaheim manufacturing facility. Every capability Pen Manufacturing offers, including CNC machining, sheet metal fabrication, welding, finishing, and assembly, is available to San Diego customers. Delivery coordination is built into the final stage of Pen Manufacturing's production workflow, so finished parts reach San Diego on schedule, backed by an average lead time of 3.2 weeks across projects that San Diego buyers can use as a planning baseline when requesting a quote.

Pen Manufacturing’s CNC machining department runs a Hurco VMX50 vertical mill with 4th-axis capability and a 50 x 26 x 24 inch work envelope, a Hurco VMX42 vertical mill, manual lathes up to 15 x 120 inches, and four knee mills. Engineering reviews each part’s critical dimensions before machining begins, supporting both prototype quantities and full production volumes for San Diego OEMs. More detail is available on the Precision CNC Machining page.

Have a precision part to quote? Request a quote from Pen Manufacturing's team.

Sheet metal fabrication cuts, punches, bends, and welds flat metal stock into enclosures, brackets, panels, and structural components, using processes such as laser cutting and waterjet cutting for industrial manufacturers. Sheet metal fabrication and CNC machining run out of the same Anaheim operation, so a San Diego OEM can combine a formed sheet metal housing with machined precision parts in a single build.

Beyond sheet metal and machining, Pen Manufacturing provides metal fabrication and welding, with MIG, TIG, and structural welding performed to AWS D1.1, D1.2, and D1.6 standards. Finished assemblies move into finishing, including powder coating, anodizing, e-coating, and galvanizing, before delivery. Every step is completed at the same Anaheim location.

Pen Manufacturing fabricates and machines parts in aluminum, stainless steel, carbon steel, brass, and bronze, along with select engineering plastics, giving San Diego OEMs a single source across the materials most commonly specified for industrial and OEM parts.

Pen Manufacturing’s quality process runs through incoming material inspection, in-process checks on dimensions and weld quality, and final inspection using a Keyence CMM and calibrated metrology to confirm a finished part matches every dimension on the drawing. This is backed by AS9100D and ISO 9001 certification, NADCAP and ITAR registration, detailed on the Quality page, giving San Diego procurement teams documentation to reference during supplier qualification.

Need certification documentation for a supplier file? Contact Pen Manufacturing to request it.