MarketsCastingsStampingSourcing SolutionsAbout UsWhy Sigma
Electrical
Electrical

An extensive range of robust fittings and weatherproof products.

Automotive
Automotive

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

Power Transmission & Distribution
Power Transmission & Distribution

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

Aerospace
Aerospace

Complex sensor housings & fracture-critical products.

Appliances
Appliances

Robust castings and assemblies for everyday appliances.

Commercial Hardware
Commercial Hardware

Finished components for commercial & residential hardware applications.

Electronics & Telecom
Electronics & Telecom

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

Fluid Power
Fluid Power

Durable, precision products for high-pressure applications.

Food & Beverage
Food & Beverage

Handles, leveling pins, flow valves & button housings.

Lighting
Lighting

Custom housings to fully assembled commercial & industrial light fixtures.

Marine
Marine

Durable corrosion-resistant engineered castings and subassemblies.

Medical & Dental
Medical & Dental

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

Oil & Gas
Oil & Gas

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

Power Tools
Power Tools

Durable yet lightweight custom metal housings.

Solar
Solar

Innovative precision metal stamped parts.

High Pressure Die Casting
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
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
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
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
Partner Services

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

Precision Metal Stamping
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
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
Partner Services

Rapid Prototypes, Heat Treating, Automated Assembly

Company History
Company History

Learn more about our company milestones.

Plant Locations
Plant Locations

Learn more about our global manufacturing facilities.

Company News
Company News

See our company announcements and press releases.

Contact Us
Contact Us

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

Resources
Resources

Download catalogs and key product guides.

Global Code of Conduct
Global Code of Conduct

Download our Code of Conduct and report violations.

Innovation at Sigma
Innovation at Sigma

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

Engineered Solutions
Engineered Solutions

Sigma offers solutions for complex product characteristics and technical requirements.

Global Supply Chain Management
Global Supply Chain Management

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

Partner Services
Partner Services

Sigma is a vertically integrated single-source solution provider.

Sustainability at Sigma
Sustainability at Sigma

Our commitment to excellence drives us to build a better, more sustainable future in all aspects of our operations.

Safety at Sigma
Safety at Sigma

Safety is more than just a priority at Sigma Engineered Solutions – it’s a core value.

Sub Category: Extension Ring

< 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

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

Two-Gang Extension Ring

Material: Metal Die-Cast
Category: Weatherproof
Sub Category: Extension Ring
Type(s): 2-Gang

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

  • Includes gasket and hardware
Color
Color Model Number
Bronze ER2A1
Gray ER2G1
ABCVolume
4.664.661.0216
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 ER10756G1
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 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 ER10752G1
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 ER10506G1
Volume
9.5
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

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

One-Gang Extension Ring

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

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

  • Rugged, seamless die-cast construction prevents moisture penetration,Includes gasket and hardware
  • Powder coated for maximum corrosion resistance,
  • Available in bulk or custom shrink wrapped packaging,
  • 1″ Depth,
Color
Color Model Number
Unpainted ER1
Bronze ER1A1
Gray ER1G1
White ER1W1
ABCVolume
4.712.941.029.5
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

3/4″ 4 Hole Flanged One-Gang Extension Ring

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

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
Color Model Number
Bronze EF10754A1
Gray EF10754G1
White EF10754W1
Volume
12.5
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.

< Products

Round Extension Ring

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

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 Master Pack Quantity UPC
Bronze 14236BR 8 031857342364
Gray 14236 8 031857142360
White 14236WH 8 031857642365
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

Two-Gang Extension Ring

Material: Metal Die-Cast
Category: Weatherproof
Sub Category: Extension Ring
Type(s): 2-Gang

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

  • Includes gasket and hardware
Color Model Number Master Pack Quantity UPC
Gray 14323 6 031857143237
ABCVolume
4.664.661.0216
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

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

  • Includes gasket and hardware
Color Model Number Master Pack Quantity UPC
Gray 14223 12 031857142230
ABCVolume
4.712.941.029.5
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

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

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

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

  • Includes gasket, hardware and closure plugs
Color Model Number Master Pack Quantity UPC
Gray 14234 10 031857142346
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.

< Products

1/2″ 4 Hole One-Gang Extension Ring

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

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 Master Pack Quantity UPC
Bronze 14233BR 5 031857342333
Gray 14233 10 031857142339
White 14233WH 5 031857642334
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.