An extensive range of robust fittings and weatherproof products.


Connectivity solutions such as high brackets, busbars, and connector pins.

Power Transmission & Distribution

Connectors & structural components for cutouts, transformers, & substations.


Complex sensor housings & fracture-critical products.


Robust castings and assemblies for everyday appliances.

Commercial Hardware

Finished components for commercial & residential hardware applications.

Electronics & Telecom

Precision metal stamped sensors, connectors and cast housings & covers.

Fluid Power

Durable, precision products for high-pressure applications.

Food & Beverage

Handles, leveling pins, flow valves & button housings.


Custom housings to fully assembled commercial & industrial light fixtures.


Durable corrosion-resistant engineered castings and subassemblies.

Medical & Dental

Medical-grade parts for implants, housings, manifolds, and pumps.

Oil & Gas

Custom housings and covers for flow control, pressure valves & meters.

Power Tools

Durable yet lightweight custom metal housings.


Innovative precision metal stamped parts.

High Pressure Die Casting

High-pressure liquid metal is pressed into a precision metal mold cavity, and then cooled & solidified under pressure.

Ideal for a wide range of applications, including automotive, agricultural, electronics, and medical.

Sand Casting

Castings with complex shapes & inner cavities that are produced in a sand mold

Ideal for parts with complex shapes and inner cavities

Gravity Die Casting

A mold is filled with liquid metal using gravity and cooled and solidified in the mold to obtain a casting

Ideal for parts with complex shapes made with steel, aluminum or magnesium alloys

Investment Casting

A process used to obtain a mold without a parting surface; creates parts with high dimensional & geometric accuracy

Ideal for near-net shaped parts with complex shapes and high precision requirements

Partner Services

Custom Tooling, Machining, Surface Finishing, Special Purpose Machine Design & Development

Precision Metal Stamping

More than 80 presses convert metal sheets into custom parts

Ideal for parts for electronic connectors and microprocessor chips

Swiss Screw Machining

A specialized CNC machine capable of producing extremely small, precise parts

Ideal for complex miniature screws, contact pins & micro-fasteners

Partner Services

Rapid Prototypes, Heat Treating, Automated Assembly

Company History

Learn more about our company milestones.

Plant Locations

Learn more about our global manufacturing facilities.

Company News

See our company announcements and press releases.

Contact Us

Let us know how we can help create a solution for you


Download catalogs and key product guides.

Global Code of Conduct

Download our Code of Conduct and report violations.

Innovation at Sigma

Purposeful innovation – the continual improvement and innovation of custom-designed and precision-made products and solutions.

Engineered Solutions

Sigma offers solutions for complex product characteristics and technical requirements.

Global Supply Chain Management

U.S.-based supply chain management teams support our customers.

Partner Services

Sigma is a vertically integrated single-source solution provider.

Engineered Solutions

Achieving Engineering Excellence

Sigma’s engineering expertise makes us the go-to partner for complex product characteristics and technical requirements. We design and produce parts with complex geometries, tight casting tolerances, and stringent porosity requirements. And our in-house product design and testing capabilities enable rapid product development with a single point of control.

We Like a Good Challenge

No matter the challenge, our more than 500 highly-skilled engineers will work with you to take your products from concept design through production.


Case Study: Reducing Product Carbon Footprint

Meeting customer needs for green and sustainable products.



A leading European-based energy technology and manufacturing company wanted to reduce the carbon footprint of a part without sacrificing quality, durability, or precision.


Sigma’s engineering team used state-of-the-art casting simulation tools to develop a solution that met all functional requirements for the part. Sigma converted the part from sand casting to die casting, which reduced the weight of the part by 25% and helped decrease the product’s carbon footprint.


Case Study: Improving Washing Machine Energy Rating

Meeting the demand for more sustainable appliances.



A leading appliance manufacturer wanted to improve the energy rating of their washing machines to appeal to sustainably-minded consumers.


Sigma’s engineering team used state-of-the-art casting simulation tools to identify multiple options for the washer drum spider that did not require changes to any mating parts. After an extensive design for manufacturability review and analysis, the final selected design reduced the weight of the spider by 33%, and parts were delivered for final testing within 10 weeks.


Case Study: Overcoming a Crowded Intellectual Property Landscape

Developing new products in a highly competitive product category.



A customer wanted to fill a gap in their weatherproof product portfolio with a new product that could be protected.


Sigma’s technical team collaborated with end users to identify product opportunities, and used lean design concepts to overcome a crowded patent landscape to develop a proprietary, patented portfolio of weatherproof while in-use covers.