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.

Connection Type: Blank

< 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

Three-Gang Blank Cover

Material: Stamped Steel
Category: Weatherproof
Sub Category: Cover
Type(s): 3-Gang
Connection Type(s): Blank

Three-gang blank covers are used with three-gang, rectangular weatherproof boxes.

  • Made from stamped steel
  • Powder coated for maximum corrosion resistance
  • Includes installation hardware and gasket
Color Model Number
Gray BC3000G1
cULus: E121488
Standards: UL 514D, CSA C22.2 No. 42.1-13
< Products

Two-Gang Blank Cover

Material: Non-Metallic
Category: Weatherproof
Sub Category: Cover
Type(s): 2-Gang
Connection Type(s): Blank

Two-gang blank covers are used with two-gang, square weatherproof boxes.

  • Protects boxes not in use.
  • Includes gasket and hardware
  • UL Marine Listed
Color
Color Model Number
Gray BC2000PG1
White BC2000PW1
AB
4.844.84
UL Marine: E332841
65!

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

< Products

Two-Gang Blank Cover

Material: Stamped Steel
Category: Weatherproof
Sub Category: Cover
Type(s): 2-Gang
Connection Type(s): Blank

Two-gang blank covers are used with two-gang, square weatherproof boxes. Protects boxes not in use.

  • Includes gasket and hardware
Color
Color Model Number
Bronze BC2000A1
Gray BC2000G1
White BC2000W1
AB
4.494.49
cULus: E121488
Standards: UL 514D, CSA C22.2 No. 42.1-13
< Products

One-Gang Blank Cover

Material: Stamped Steel
Category: Weatherproof
Sub Category: Cover
Type(s): 1-Gang
Connection Type(s): Blank

One-gang blank covers are used with one-gang, rectangular weatherproof boxes. Protects boxes not in use.

  • Made from stamped steel
  • Powder coated for maximum corrosion resistance
  • Includes installation hardware and gasket
Color
Color Model Number
Bronze BC1002A1
Black BC1002B1
Gray BC1002G1
White BC1002W1
cULus: E121488
Standards: UL 514D, CSA C22.2 No. 42.1-13
< Products

One-Gang Blank Cover

Material: Stamped Steel
Category: Weatherproof
Sub Category: Cover
Type(s): 1-Gang
Connection Type(s): Blank

One-gang blank covers are used with one-gang, rectangular 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 BC1001G1
cULus: E121488
Standards: UL 514D, CSA C22.2 No. 42.1-13
< Products

One-Gang Blank Cover

Material: Non-Metallic
Category: Weatherproof
Sub Category: Cover
Type(s): 1-Gang
Connection Type(s): Blank

One-gang blank covers are used with one-gang, rectangular weatherproof boxes.

  • Protects boxes not in use.
  • Includes gasket and hardware
  • UL Marine Listed
Color
Color Model Number
Gray BC1001PG1
White BC1001PW1
AB
4.632.87
UL Marine: E332841
65!

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

< Products

One-Gang Blank Cover

Material: Stamped Steel
Category: Weatherproof
Sub Category: Cover
Type(s): 1-Gang
Connection Type(s): Blank

One-gang blank covers are used with one-gang, rectangular weatherproof boxes. Protects boxes not in use.

  • Includes gasket and hardware,Made from stamped steel
  • ,Powder coated for maximum corrosion resistance
  • ,Includes installation hardware and gasket
Color
Color Model Number
Bronze BC1000A1
Black BC1000B1
Gray BC1000G1
White BC1000W1
AB
4.522.77
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

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

Two-Gang Blank Cover

Material: Non-Metallic
Category: Weatherproof
Sub Category: Cover
Type(s): 2-Gang
Connection Type(s): Blank

Two-gang blank covers are used with two-gang, square weatherproof boxes.

  • Protects boxes not in use.
  • Includes gasket and hardware
  • UL Marine Listed
Color
Color Model Number Master Pack Quantity UPC
Gray 14160 10 031857141608
White 14160WH 10 031857641603
AB
4.844.84
UL Marine: E332841
65!

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

< Products

Two-Gang Blank Cover

Material: Stamped Steel
Category: Weatherproof
Sub Category: Cover
Type(s): 2-Gang
Connection Type(s): Blank

Two-gang blank covers are used with two-gang, square weatherproof boxes. Protects boxes not in use.

  • Includes gasket and hardware
Color
Color Model Number Master Pack Quantity UPC
Bronze 14340BR 10 031857343408
Gray 14340 10 031857143404
White 14340WH 10 031857643409
AB
4.494.49
cULus: E121488
Standards: UL 514D, CSA C22.2 No. 42.1-13
< Products

One-Gang Blank Cover

Material: Stamped Steel
Category: Weatherproof
Sub Category: Cover
Type(s): 1-Gang
Connection Type(s): Blank

One-gang blank covers are used with one-gang, rectangular weatherproof boxes. Protects boxes not in use.

  • Includes gasket and hardware
Color
Color Model Number Master Pack Quantity UPC
Bronze 14240BR 20 031857342401
Gray 14240 20 031857142407
White 14240WH 20 031857642402
AB
4.522.77
cULus: E121488
Standards: UL 514D, CSA C22.2 No. 42.1-13
< Products

One-Gang Blank Cover

Material: Non-Metallic
Category: Weatherproof
Sub Category: Cover
Type(s): 1-Gang
Connection Type(s): Blank

One-gang blank covers are used with one-gang, rectangular weatherproof boxes.

  • Protects boxes not in use.
  • Includes gasket and hardware
  • UL Marine Listed
Color
Color Model Number Master Pack Quantity UPC
Gray 14150 20 031857141509
White 14150WH 20 031857641504
AB
4.632.87
UL Marine: E332841
65!

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