MarketsCastingsStampingSourcing SolutionsAbout UsWhy Sigma
Electrical

An extensive range of robust fittings and weatherproof products.

Automotive

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

Power Transmission & Distribution

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

Aerospace

Complex sensor housings & fracture-critical products.

Appliances

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.

Lighting

Custom housings to fully assembled commercial & industrial light fixtures.

Marine

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.

Solar

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

Resources

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.

Connection Type: With Outlets

< Products

Round Extension Ring

Material: Metal Die-Cast
Category: Weatherproof
Sub Category: Extension Ring
Type(s): Round
Connection Type(s): With Outlets

Extension rings are used to provide additional capacity to a weatherproof box for larger fill requirements.

  • Includes gasket, hardware and closure plugs
  • Rugged, seamless die-cast construction prevents moisture penetration
  • Tapered internal NPT threaded hubs comply with NEMA requirements and accept threaded conduit fittings or threaded conduits for a secure installation
  • Powder coated for maximum corrosion resistance
  • Closure plugs provided with outlet versions
  • Available in bulk or custom shrink wrapped packaging
  • 1-1/2″ Depth
Color
Color Model Number
Bronze ER70504A1
Gray ER70504G1
Unpainted ER70504U
White ER70504W1
ABCVolume
4.194.131.6116.5
UL: E121488
CSA: LR57925
Standards: UL 514A, CSA C22.2 No. 18.1-13
65!

WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov.

< Products

Round Extension Ring

Material: Metal Die-Cast
Category: Weatherproof
Sub Category: Extension Ring
Type(s): Round
Connection Type(s): With Outlets

May be used to provide additional capacity for box fill requirements

  • Rugged, seamless die-cast construction prevents moisture penetration
  • Tapered internal NPT threaded hubs comply with NEMA requirements and accept threaded conduit fittings or threaded conduits for a secure installation
  • Powder coated for maximum corrosion resistance
  • Closure plugs provided with outlet versions
  • Available in bulk or custom shrink wrapped packaging
  • 1-1/2″ Depth
Color Model Number
Gray ER70754G1
Volume
16.5
UL: E121488
CSA: LR57925
Standards: UL 514A, CSA C22.2 No. 18.1-13
< Products

One-Gang Extension Ring

Material: Metal Die-Cast
Category: Weatherproof
Sub Category: Extension Ring
Type(s): 1-Gang
Connection Type(s): With Outlets

May be used to provide additional capacity for box fill requirements

  • Rugged, seamless die-cast construction prevents moisture penetration
  • Tapered internal NPT threaded hubs comply with NEMA requirements and accept threaded conduit fittings or threaded conduits for a secure installation
  • Powder coated for maximum corrosion resistance
  • Closure plugs provided with outlet versions
  • Available in bulk or custom shrink wrapped packaging
  • 1-1/2″ Depth
Color Model Number
Gray ER10754G1
Volume
11
UL: E121488
CSA: LR57925
Standards: UL 514A, CSA C22.2 No. 18.1-13
< Products

One-Gang Extension Ring

Material: Metal Die-Cast
Category: Weatherproof
Sub Category: Extension Ring
Type(s): 1-Gang
Connection Type(s): With Outlets

May be used to provide additional capacity for box fill requirements

  • Rugged, seamless die-cast construction prevents moisture penetration
  • Tapered internal NPT threaded hubs comply with NEMA requirements and accept threaded conduit fittings or threaded conduits for a secure installation
  • Powder coated for maximum corrosion resistance
  • Closure plugs provided with outlet versions
  • Available in bulk or custom shrink wrapped packaging
  • 1-1/2″ Depth
Color Model Number
Gray ER10756G1
Volume
11
UL: E121488
CSA: LR57925
Standards: UL 514A, CSA C22.2 No. 18.1-13
< Products

1/2″ 4 Hole One-Gang Extension Ring

Material: Metal Die-Cast
Category: Weatherproof
Sub Category: Extension Ring
Type(s): 1-Gang
Connection Type(s): With Outlets

Extension rings are used to provide additional capacity to a weatherproof box for larger fill requirements.

  • Includes gasket, hardware and closure plugs
Color
Color Model Number
Bronze ER10504A1
Gray ER10504G1
White ER10504W1
ABCVolume
4.572.861.319.5
UL: E121488
CSA: LR57925
Standards: UL 514A, CSA C22.2 No. 18.1-13
65!

WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov.

< Products

One-Gang Extension Ring

Material: Metal Die-Cast
Category: Weatherproof
Sub Category: Extension Ring
Type(s): 1-Gang
Connection Type(s): With Outlets

May be used to provide additional capacity for box fill requirements

  • Rugged, seamless die-cast construction prevents moisture penetration
  • Tapered internal NPT threaded hubs comply with NEMA requirements and accept threaded conduit fittings or threaded conduits for a secure installation
  • Powder coated for maximum corrosion resistance
  • Closure plugs provided with outlet versions
  • Available in bulk or custom shrink wrapped packaging
  • 1-1/2″ Depth
Color Model Number
Gray ER10506G1
Volume
9.5
UL: E121488
CSA: LR57925
Standards: UL 514A, CSA C22.2 No. 18.1-13
< Products

One-Gang Extension Ring

Material: Metal Die-Cast
Category: Weatherproof
Sub Category: Extension Ring
Type(s): 1-Gang
Connection Type(s): With Outlets

May be used to provide additional capacity for box fill requirements

  • Rugged, seamless die-cast construction prevents moisture penetration
  • Tapered internal NPT threaded hubs comply with NEMA requirements and accept threaded conduit fittings or threaded conduits for a secure installation
  • Powder coated for maximum corrosion resistance
  • Closure plugs provided with outlet versions
  • Available in bulk or custom shrink wrapped packaging
  • 1-1/2″ Depth
Color Model Number
Gray ER10752G1
Volume
11
UL: E121488
CSA: LR57925
Standards: UL 514A, CSA C22.2 No. 18.1-13
< Products

1/2″ 2 Hole One-Gang Extension Ring

Material: Metal Die-Cast
Category: Weatherproof
Sub Category: Extension Ring
Type(s): 1-Gang
Connection Type(s): With Outlets

May be used to provide additional capacity for box fill requirements

  • Rugged, seamless die-cast construction prevents moisture penetration
  • Tapered internal NPT threaded hubs comply with NEMA requirements and accept threaded conduit fittings or threaded conduits for a secure installation
  • Powder coated for maximum corrosion resistance
  • Closure plugs provided with outlet versions
  • Available in bulk or custom shrink wrapped packaging
  • 1-1/2″ Depth
Color Model Number
Gray ER10502G1
Volume
9.5
UL: E121488
CSA: LR57925
Standards: UL 514A, CSA C22.2 No. 18.1-13
< Products

1/2″ 4 Hole Flanged One-Gang Extension Ring

Material: Metal Die-Cast
Category: Weatherproof
Sub Category: Extension Ring
Type(s): 1-Gang
Connection Type(s): FlangedWith Outlets

Extension rings are used to provide additional capacity to a weatherproof box for larger fill requirements.

  • Includes gasket, hardware and closure plugs
Color
Color Model Number
Bronze EF10504A1
Gray EF10504G1
White EF10504W1
ABCVolume
4.572.861.3112.5
UL: E121488
CSA: LR57925
Standards: UL 514A, CSA C22.2 No. 18.1-13
65!

WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov.