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

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Contact Us

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


Download catalogs and key product guides.

Global Code of Conduct

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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.

Power Transmission & Distribution Market Solutions

Supporting Power Infrastructure with Technical Expertise and Reliability

Sigma Engineered Solutions is a trusted and proven provider of castings and products that are used extensively in the transmission and distribution of electrical power. Our connectors and structural components are used in a wide range of applications including cutout switchgear, pole type transformers, substation switchgear, and transmission lines. Our products are ubiquitous in complex assemblies used in applications that reliably move electrical power from the grid to homes and businesses.

Sigma is a leading partner to U.S. and global market leaders that build and maintain the power grid providing engineering, product development, logistics, supply chain, and manufacturing solutions.

At Sigma Castings, we understand the mission-critical nature of the application for these products.  To provide years of trouble-free performance in power grid infrastructure applications, all products undergo stringent testing to ensure consistent quality and reliability.  We offer precision cast products in a broad range of alloys, all under one roof.

Our durable components deliver exceptional performance in harsh conditions and high cycle use.  And our global supply chain logistics, combined with our North Carolina-based warehouse, allow us to maintain industry-leading fill rates and respond quickly to changes in demand.

power sub station with blue skies
Distribution Cutout Components
Transformer Components
Pole Line Hardware

Distribution Cutout Components

Bottom Hinges and Trunnions
Top and Bottom Ferrules
Terminal Connectors

Transformer Components

Spade Bushings
Tank Ground Connectors

Pole Line Hardware

Pole Line Hardware
Machined Components

Additional Product Examples

Hot Line Clamps
Hot Line Clamps
Let us help you with your product needs.
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working on an electrical transformer

Our Services

Sigma offers a number of services that can help with your Power Transmission & Distribution product needs.

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Rapid Prototyping

Product Testing

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Custom Tooling

Precision Machining

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Surface Finishing

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Special Purpose Machine Design & Development

See All Services