MarketsCastingsConnectivityAbout 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.

Product Type: Round

< Products

Round Lampholder Cover with Three 1/2″ Holes

Material: Non-Metallic
Category: Weatherproof
Sub Category: Cover
Type(s): Round
Connection Type(s): ClusterLampholder

Three hole cluster covers are used to provide a mounting location for up to three lampholders to a 4″ round weatherproof box.

  • With three 1/2″ threaded knockouts
  • Includes gasket, hardware and closure plugs
Color
Color Model Number
Gray GC7053PG1
White GC7053PW1
AB
4.51.17
cULus: E163827
Standards: UL 1598, CSA C22.2 No. 250.0-08
65!

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

< Products

Round Cover with Three 1/2″ Holes

Material: Stamped Steel
Category: Weatherproof
Sub Category: Cover
Type(s): Round
Connection Type(s): ClusterLampholder

Three hole cluster covers are used to provide a mounting location for up to three lampholders to a 4″ round weatherproof box.

  • With three 1/2″ threaded knockouts
  • Includes gasket, hardware and closure plugs
Color
Color Model Number
Bronze GC7053A1
Black GC7053B1
Gray GC7053G1
White GC7053W1
AB
4.131.04
cULus: E163827
Standards: UL 1598, CSA C22.2 No. 250.0-08
65!

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

< Products

Round Lamp Holder Covers

Material: Stamped Steel
Category: Weatherproof
Sub Category: Cover
Type(s): Round
Connection Type(s): ClusterLampholder

For use with 4″ round boxes

  • Cluster covers provide easy means for mounting lampholders and/or accessories
  • Rugged, seamless die-cast construction
  • Powder coated for maximum corrosion resistance
  • Includes installation hardware and gasket
  • 2 closure plugs included with 2 and 3 hole cluster covers
  • Available in bulk or custom shrink wrapped packaging
Color
Color Model Number
Bronze GC7052A1
Gray GC7052G1
Unpainted GC7052U1
White GC7052W1
cULus: E163827
Standards: UL 1598, CSA C22.2 No. 250.0-08
< Products

Round Cover with One 1/2″ Hole

Material: Stamped Steel
Category: Weatherproof
Sub Category: Cover
Type(s): Round
Connection Type(s): ClusterLampholder

One hole cluster covers are used to provide a mounting location for a single lampholder to a 4″ round weatherproof box.

  • With one 1/2″ threaded knockout
  • Includes gasket and hardware
Color
Color Model Number
Bronze GC7051A1
Black GC7051B1
Gray GC7051G1
Unpainted GC7051U1
White GC7051W1
AB
4.130.57
cULus: E163827
Standards: UL 1598, CSA C22.2 No. 250.0-08
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

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 Blank Cover

Material: Stamped Steel
Category: Weatherproof
Sub Category: Cover
Type(s): Round
Connection Type(s): Blank

Round blank covers are used with 4″ round weatherproof boxes. Protects boxes not in use.

  • Made from stamped steel
  • Powder coated for maximum corrosion resistance
  • Includes installation hardware and gasket
Color Model Number
Gray BC7004G1
cULus: E121488
Standards: UL 514D, CSA C22.2 No. 42.1-13
< Products

Round Blank Cover

Material: Non-Metallic
Category: Weatherproof
Sub Category: Cover
Type(s): Round
Connection Type(s): Blank

Round blank covers are used with 4″ round weatherproof boxes.

  • Protects boxes not in use.
  • Includes gasket and hardware
  • UL Marine Listed
Color
Color Model Number
Gray BC7000PG1
White BC7000PW1
A
4.29
UL Marine: E332841
65!

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

< Products

Round Blank Cover

Material: Stamped Steel
Category: Weatherproof
Sub Category: Cover
Type(s): Round
Connection Type(s): Blank

Round blank covers are used with 4″ round weatherproof boxes. Protects boxes not in use.

  • Includes gasket and hardware
Color
Color Model Number
Bronze BC7000A1
Gray BC7000G1
White BC7000W1
A
4.13
cULus: E121488
Standards: UL 514D, CSA C22.2 No. 42.1-13
< Products

Five Hole Round Box & Round Cover

Material: Metal Die-Cast
Category: Weatherproof
Sub Category: BoxCoverKit
Type(s): Round
Connection Type(s): Blank

May be used as a weatherproof junction box or as a housing for electrical devices in wet, damp or dry locations

  • Rugged, seamless die-cast construction prevents moisture penetration
  • Reinforced connector outlets provide secure installation
  • Powder coated for maximum corrosion resistance
  • Closure plugs, ground screws and mounting lugs included
  • Available in bulk or custom shrink wrapped packaging
Color Model Number
Gray ACB707FG1
cULus: E121488
Standards: UL 514D, CSA C22.2 No. 42.1-13
< Products

Five Hole Round Box & Round Cover

Material: Metal Die-Cast
Category: Weatherproof
Sub Category: BoxCoverKit
Type(s): Round
Connection Type(s): Blank

May be used as a weatherproof junction box or as a housing for electrical devices in wet, damp or dry locations

  • Rugged, seamless die-cast construction prevents moisture penetration
  • Reinforced connector outlets provide secure installation
  • Powder coated for maximum corrosion resistance
  • Closure plugs, ground screws and mounting lugs included
  • Available in bulk or custom shrink wrapped packaging
Color Model Number
Gray ACB705FG1
cULus: E121488
Standards: UL 514D, CSA C22.2 No. 42.1-13
< Products

3/4″ 5 Hole Round Box

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

Round outlet boxes are used as a weatherproof junction box or mounting location for lampholders in wet, damp or dry locations.

  • Includes pre-installed ground screw, closure plugs and hardware
Color
Color Model Number
Bronze 71075A1
Gray 71075G1
White 71075W1
ABCVolume
5.514.131.6216
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

5 Hole Round Outlet Box

Material: Non-Metallic
Category: Weatherproof
Sub Category: Box
Type(s): Round

Round outlet boxes are used as a weatherproof junction box or mounting location for lampholders in wet, damp or dry locations.

  • 1/2″ or 3/4″ holes
  • Reducers included
  • Includes 3/4″ – 1/2″ reducing bushings and closure plugs
  • UL Marine Listed
Color
Color Model Number
Gray 71075REPG1
White 71075REPW1
Volume
13.8
UL Marine: E332841
65!

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

< Products

1/2″ 5 Hole Round Box

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

Round outlet boxes are used as a weatherproof junction box or mounting location for lampholders in wet, damp or dry locations.

  • Includes pre-installed ground screw, closure plugs and hardware
Color
Color Model Number
Bronze 71055A1
Black 71055B1
Gray 71055G1
White 71055W1
ABCVolume
5.514.131.6216
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

Gasket Kit

Material: Crosslinked Polyethylene Foam
Category: Weatherproof
Sub Category: Accessories
Type(s): 1-Gang2-GangGasketRound

Gaskets are used in conjunction with weatherproof boxes and covers for weatherproof installation.

  • Tear-out sections in one- and two-gang gaskets are adaptable for GFCI, duplex, round and switch devices
  • Includes (2) one-gang, (2) two-gang and (2) round gaskets
Color Model Number Master Pack Quantity UPC
Black 14000 5 031857140007
< Products

Round Lampholder Cover with Three 1/2″ Holes

Material: Non-Metallic
Category: Weatherproof
Sub Category: Cover
Type(s): Round
Connection Type(s): ClusterLampholder

Three hole cluster covers are used to provide a mounting location for up to three lampholders to a 4″ round weatherproof box.

  • With three 1/2″ threaded knockouts
  • Includes gasket, hardware and closure plugs
Color
Color Model Number Master Pack Quantity UPC
Gray 14390 15 031857143909
White 14390WH 15 031857643904
AB
4.51.17
cULus: E163827
Standards: UL 1598, CSA C22.2 No. 250.0-08
65!

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

< Products

Round Cover with Three 1/2″ Holes

Material: Metal Die-Cast
Category: Weatherproof
Sub Category: Cover
Type(s): Round
Connection Type(s): ClusterLampholder

Three hole cluster covers are used to provide a mounting location for up to three lampholders to a 4″ round weatherproof box.

  • With three 1/2″ threaded knockouts
  • Includes gasket, hardware and closure plugs
Color
Color Model Number Master Pack Quantity UPC
Bronze 14383BR 12 031857343835
Gray 14383 15 031857143831
White 14383WH 12 031857643836
AB
4.131.04
cULus: E163827
Standards: UL 1598, CSA C22.2 No. 250.0-08
65!

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

< Products

Round Cover with One 1/2″ Hole

Material: Metal Die-Cast
Category: Weatherproof
Sub Category: Cover
Type(s): Round
Connection Type(s): ClusterLampholder

One hole cluster covers are used to provide a mounting location for a single lampholder to a 4″ round weatherproof box.

  • With one 1/2″ threaded knockout
  • Includes gasket and hardware
Color
Color Model Number Master Pack Quantity UPC
Bronze 14381BR 10 031857343811
Gray 14381 20 031857143817
White 14381WH 10 031857643812
AB
4.130.57
cULus: E163827
Standards: UL 1598, CSA C22.2 No. 250.0-08
65!

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

< Products

Round Gasket

Material: Crosslinked Polyethylene Foam
Category: Weatherproof
Sub Category: Accessories
Type(s): GasketRound

Round gaskets are used in conjunction with 4″ round boxes and covers for weatherproof installation.

Color Model Number Master Pack Quantity UPC
Black 14002 20 031857140021
AB
4.212.45
< 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

Round Blank Cover

Material: Non-Metallic
Category: Weatherproof
Sub Category: Cover
Type(s): Round
Connection Type(s): Blank

Round blank covers are used with 4″ round weatherproof boxes.

  • Protects boxes not in use.
  • Includes gasket and hardware
  • UL Marine Listed
Color
Color Model Number Master Pack Quantity UPC
Gray 14170 20 031857141707
White 14170WH 20 031857641702
A
4.29
< Products

Round Blank Cover

Material: Stamped Steel
Category: Weatherproof
Sub Category: Cover
Type(s): Round
Connection Type(s): Blank

Round blank covers are used with 4″ round weatherproof boxes. Protects boxes not in use.

  • Includes gasket and hardware
Color
Color Model Number Master Pack Quantity UPC
Bronze 14241BR 20 031857342418
Gray 14241 20 031857142414
White 14241WH 20 031857642419
A
4.13
cULus: E121488
Standards: UL 514D, CSA C22.2 No. 42.1-13
< Products

5 Hole Round Outlet Box

Material: Non-Metallic
Category: Weatherproof
Sub Category: Box
Type(s): Round

Round outlet boxes are used as a weatherproof junction box or mounting location for lampholders in wet, damp or dry locations.

  • 1/2″ or 3/4″ holes
  • Reducers included
  • Includes 3/4″ – 1/2″ reducing bushings and closure plugs
  • UL Marine Listed
Color
Color Model Number Master Pack Quantity UPC
Gray 14130 13 031857141301
White 14130WH 13 031857641306
ABCVolume
5.554.271.513.8
UL Marine: E332841
65!

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

< Products

3/4″ 5 Hole Round Box

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

Round outlet boxes are used as a weatherproof junction box or mounting location for lampholders in wet, damp or dry locations.

  • Includes pre-installed ground screw, closure plugs and hardware
Color
Color Model Number Master Pack Quantity UPC
Bronze 143854-75BR 8 031857438586
Gray 143854-75 13 031857438579
White 143854-75WH 8 031857438593
ABCVolume
5.514.131.6216
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″ 5 Hole Round Box

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

Round outlet boxes are used as a weatherproof junction box or mounting location for lampholders in wet, damp or dry locations.

  • Includes pre-installed ground screw, closure plugs and hardware
Color
Color Model Number Master Pack Quantity UPC
Bronze 143854BR 13 031857343859
Gray 143854 13 031857143855
White 143854WH 13 031857643850
ABCVolume
5.514.131.6216
UL: E121488
CSA: LR57925
Standards: UL 514A, CSA C22.2 No. 18.1-13
65!

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