Custom Metal Fabrication & CNC Machining in Los Angeles, CA

Pen Manufacturing provides sheet metal fabrication, CNC machining, and custom metal fabrication services to OEMs, engineers, and procurement teams in Los Angeles from its Anaheim location, which has supported the area for more than 40 years. As a steel fabricator working in aluminum, stainless steel, and carbon steel, Pen Manufacturing is AS9100D and ISO 9001 certified, NADCAP and ITAR registered, and supports sheet metal, welding, machining, and finishing under one roof.

Sheet metal and plate stock are cut on Pen Manufacturing’s laser, punching, and shearing equipment, then formed on press brakes rated at 10 feet and 100 tons, 14 feet and 200 tons, and 8 feet and 60 tons. Formed parts move to the welding department for MIG, TIG, and structural welding to AWS D1.1, D1.2, and D1.6 standards. Where a design calls for precision features, CNC machined components are added before the build moves into finishing and assembly. Every stage happens at the same location, so Los Angeles OEMs work with one team from raw stock to finished part.

While CNC machining removes material from a solid block to create a part, sheet metal fabrication and metal fabrication more broadly cut, bend, form, and join flat metal stock into finished structures. Pen Manufacturing offers both under one roof from its Anaheim facility, so a Los Angeles OEM can combine a formed sheet metal enclosure with CNC machined precision components in a single build rather than sourcing each from a separate shop.

Not sure which process fits your part? Request a quote and Pen Manufacturing's engineering team can help you decide.

As steel fabricators, Pen Manufacturing works in structural steel, stainless steel, and carbon steel fabrication, alongside aluminum and sheet metal work, giving Los Angeles OEMs a single source for structural brackets, enclosures, and welded assemblies regardless of which steel grade a project calls for.

Alongside steel fabrication, the Anaheim location runs Hurco VMX50 and VMX42 CNC vertical mills, manual lathes, and knee mills for machined components. Finishing options include powder coating, anodizing, e-coating, and galvanizing, so a fabricated assembly can be machined, welded, and finished without leaving Pen Manufacturing.

Pen Manufacturing fabricates parts in aluminum, stainless steel, carbon steel, brass, and bronze, along with select engineering plastics, so a Los Angeles OEM is not limited to whatever a single material specialist happens to stock.

Pen Manufacturing's quality control runs through incoming material inspection, which verifies that raw materials meet specified grades and dimensional requirements before reaching a machine or fabrication station, followed by in-process inspection of dimensions, weld quality, and surface conditions at multiple stages during production. Final inspection and documentation, supported by a Keyence CMM and calibrated metrology, confirm the finished part meets every dimension on the drawing, providing traceability for regulated industries such as aerospace and medical devices. This process is detailed on the Quality page.

Need documented quality records for your supplier file? Contact Pen Manufacturing to request certification and inspection documentation.