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 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
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

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.

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

< Products

Reducing Washer

Material: Zinc-Plated Steel
Category: Fittings
Sub Category: Rigid
Type(s): Washer
Connection Type(s): Reducing

Reducing washers are used to reduce the size of a knockout in a steel outlet box or metal enclosure. Two reducing washers are required for each knockout.

  • Embossed for self-centering
Model Number
RW075/050
RW100/050
RW100/075
RW125/050
RW125/075
RW125/100
RW150/050
RW150/075
RW150/100
RW150/125
RW200/050
RW200/075
RW200/100
RW200/125
RW200/150
RW250/050
RW250/075
RW250/100
RW250/125
RW250/150
RW250/200
ABC
0.871.440.04
ABC
0.871.750.04
ABC
1.111.750.04
ABC
0.872.190.04
ABC
1.112.190.04
ABC
1.372.190.04
ABC
0.872.440.04
ABC
1.372.440.04
ABC
1.722.440.04
ABC
1.7230.04
ABC
1.9830.04
ABC
2.463.50.04
cULus: E121487

Standards: UL 514B, CSA C22.2 No. 18.3-12
< Products

Reducing Bushing

Material: Zinc Die-Cast
Category: Fittings
Sub Category: Rigid
Type(s): Bushing
Connection Type(s): Reducing

Reducing bushings are used to reduce the entry size of threaded conduit to allow joining conduits of two different sizes.

Model Number
RB075/050
RB100/050
RB100/075
ABC
0.630.820.16
ABC
0.7110.14
ABC
0.7110.14
UL: E155411
CSA: LR57925

Standards: UL 514B, CSA C22.2 No. 18.3-12
< Products

Reducing Washer

Material: Zinc-Plated Steel
Category: Fittings
Sub Category: Rigid
Type(s): Washer
Connection Type(s): Reducing

Reducing washers are used to reduce the size of a knockout in a steel outlet box or metal enclosure. Two reducing washers are required for each knockout.

  • Embossed for self-centering
Model Number Retail Pack Master Pack Package Type
49301 2 50 Polybag
18002 4 10 Polybag
55001 100 10 Bulk - No Individual UPC
49302 2 25 Polybag
18000 4 10 Polybag
49303 2 25 Polybag
18001 4 10 Polybag
49305 2 15 Polybag
18011 2 10 Polybag
49306 2 20 Polybag
49309 2 25 Polybag
18012 2 10 Polybag
49310 2 50 Polybag
49314 2 25 Polybag
49315 2 20 Polybag
49421 2 25 Polybag
ABC
0.871.440.04
ABC
0.871.750.04
ABC
1.111.750.04
ABC
1.112.190.04
ABC
1.372.190.04
ABC
1.372.440.04
ABC
1.722.440.04
ABC
1.7230.04
ABC
1.9830.04
ABC
2.463.50.04
cULus: E121487

Standards: UL 514B, CSA C22.2 No. 18.3-12
< Products

Reducing Bushing

Material: Zinc Die-Cast
Category: Fittings
Sub Category: Rigid
Type(s): Bushing
Connection Type(s): Reducing

Reducing bushings are used to reduce the entry size of threaded conduit to allow joining conduits of two different sizes.

Model Number Retail Pack Master Pack Package Type
49001 1 25 Polybag
49002 1 25 Polybag
49003 1 25 Polybag
ABC
0.630.820.16
ABC
0.7110.14
ABC
0.7110.14
UL: E155411
CSA: LR57925

Standards: UL 514B, CSA C22.2 No. 18.3-12
< Products

Reducing Bushing

Material: Zinc-Plated Steel
Category: Fittings
Sub Category: Rigid
Type(s): Bushing
Connection Type(s): Reducing

Reducing bushings are used to reduce the entry size of threaded conduit to allow joining conduits of two different sizes.

Model Number Retail Pack Master Pack Package Type
49186 1 10 Polybag
49080 1 10 Polybag
59014 1 10 Boxed - Individual UPC
ABC
0.641.430.11
ABC
0.711.680.13
ABC
0.812.10.16