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.

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.

Feature: Snap Lock®

< Products

Snap Lock® Screw-In Connector

Material: Zinc Die-Cast
Category: Fittings
Sub Category: Flex
Type(s): Connector
Connection Type(s): Screw-In
Feature(s): Snap Lock®

Snap Lock® screw-in type connectors are used to terminate FMC/RWFMC to a knockout in a dry location box or enclosure.

  • Faster installation with no locknut required
  • Screws into conduit
Trade Size
Model Number
SICN037S
SICN050S
ABC
1.190.830.4
ABC
1.270.830.4
UL: E155411
CSA: LR57925
Standards: UL 514B, CSA C22.2 No. 18.3-12
< Products

Snap Lock® Saddle Connector

Material: Zinc Die-Cast
Category: Fittings
Sub Category: Flex
Type(s): Connector
Connection Type(s): Saddle
Feature(s): Snap Lock®

Snap Lock® saddle connectors are used to terminate NM, AC or MC to a knockout in a dry location box or enclosure.

  • Faster installation with no locknut required
  • Refer to Connector Listing PDF under RESOURCES tab below for specific cable and conduit ranges
Trade Size
Model Number
SAD037S
ABC
1.651.040.93
cULus: E155411
Standards: UL 514B, CSA C22.2 No. 18.3-12
< Products

Snap Lock® Clamp Type Connector

Material: Zinc Die-Cast
Category: Fittings
Sub Category: NMSE
Type(s): Connector
Connection Type(s): Clamp Type
Feature(s): Snap Lock®

Snap Lock® clamp type connectors are used to terminate NM Sheathed, Flexible Cord, Oval or Round SE cables to a knockout in a dry location box or enclosure. The Snap Lock® design requires no tools when attaching to the box for faster installation.

  • Faster installation – no locknut assembly
  • Assembled with die cast locknut and zinc plated screws
  • Refer to Connector Listing PDF under RESOURCES tab below for specific cable and conduit ranges
Trade Size
Model Number
RX037S
RX075S
ABC
0.861.170.39
ABC
11.670.47
cULus: E213494
Standards: UL 514B, CSA C22.2 No. 18.3-12
< Products

Snap Lock® Compression Coupling

Material: Zinc Die-Cast
Category: Fittings
Sub Category: EMT
Type(s): Coupling
Connection Type(s): Compression
Feature(s): Concrete-TightRain-TightSnap Lock®

Snap Lock® compression type couplings are used to join lengths of steel EMT conduit without the use of tools. The patent pending Snap Lock® design provides a faster installation. For wet location applications.

  • Conduit snaps into coupling
  • Concrete-tight
  • Rain-tight
Trade Size
Model Number
ECOP050
ECOP075
ABC
1.351.260.81
ABC
1.431.51.03
cULus: E210498
Standards: UL 514B, CSA C22.2 No. 18.3-12
< Products

Snap Lock® Compression Connector

Material: Zinc Die-Cast
Category: Fittings
Sub Category: EMT
Type(s): Connector
Connection Type(s): Compression
Feature(s): Concrete-TightRain-TightSnap Lock®

Snap Lock® compression type connectors are used to secure and terminate steel EMT conduit to a knockout in a metal box or enclosure. The patent-pending Snap Lock® design provides a faster installation allowing the EMT conduit to snap into the fitting without the use of tools. For wet or dry location applications.

  • Conduit snaps into connector
  • Concrete-tight
  • Rain-tight
Trade Size
Model Number
ECON050
ECON075
ABC
1.151.260.39
ABC
1.181.50.39
cULus: E210498
Standards: UL 514B, CSA C22.2 No. 18.3-12
< Products

Double Snap Lock® Duplex Connector – Steel

Material: Zinc-Plated Steel
Category: Fittings
Sub Category: Flex
Type(s): Connector
Connection Type(s): Duplex
Feature(s): Double Snap Lock®Snap Lock®

Double Snap Lock® duplex connectors are used to terminate two runs of AC, MC or FMC/RWFMC to a knockout in a dry location box or enclosure. The patented Double Snap Lock® design provides a faster installation.

  • No tools required
  • Robust insulator will not fall out
  • Refer to Connector Listing PDF under RESOURCES tab below for specific cable and conduit ranges
Trade Size
Model Number
DUPS1DSI
cULus: E155411
Standards: UL 514B, CSA C22.2 No. 18.3-12
< Products

Snap Lock® Duplex Connector

Material: Zinc Die-Cast
Category: Fittings
Sub Category: Flex
Type(s): Connector
Connection Type(s): Duplex
Feature(s): Snap Lock®

Snap Lock® duplex connectors are used to terminate two runs of AC, MC or FMC/RWFMC to a knockout in a dry location box or enclosure.

  • Faster installation with no locknut required
  • Refer to Connector Listing PDF under RESOURCES tab below for specific cable and conduit ranges
Trade Size
Model Number
DUP1S
ABC
1.641.450.41
cULus: E155411
Standards: UL 514B, CSA C22.2 No. 18.3-12
< Products

Double Snap Lock® Duplex Connector

Material: Zinc Die-Cast
Category: Fittings
Sub Category: Flex
Type(s): Connector
Connection Type(s): Duplex
Feature(s): Double Snap Lock®Snap Lock®

Double Snap Lock® duplex connectors are used to terminate two runs of AC, MC or FMC/RWFMC to a knockout in a dry location box or enclosure. The patented Double Snap Lock® design provides a faster installation.

  • No tools required
  • Robust insulator will not fall out
  • Refer to Connector Listing PDF under RESOURCES tab below for specific cable and conduit ranges
Trade Size
Model Number
DUP1DSI
ABC
2.11.490.4
cULus: E155411
Standards: UL 514B, CSA C22.2 No. 18.3-12
< Products

Double Snap Lock® Cut-In Connector

Material: Zinc Die-Cast
Category: Fittings
Sub Category: Flex
Type(s): Connector
Connection Type(s): Cut-In
Feature(s): Double Snap Lock®Snap Lock®

Used to terminate armored or metal clad cable to an enclosure or outlet box

  • Die-cast from high strength zinc alloy
  • Refer to Connector Listing PDF under RESOURCES tab below for specific cable and conduit ranges
Trade Size
Model Number
CBXC037DSI
cULus: E155411
Standards: UL 514B, CSA C22.2 No. 18.3-12
< Products

Double Snap Lock® AC/MC Connector – Steel

Material: Steel
Category: Fittings
Sub Category: Flex
Type(s): Connector
Connection Type(s): AC/MC
Feature(s): Double Snap Lock®Snap Lock®

Double Snap Lock® AC/MC connectors are used to terminate AC, MC or FMC/RWFMC to a knockout in a dry location box or enclosure. The patented Double Snap Lock® design provides a faster installation.

  • No tools required
  • Robust insulator will not fall out
  • Refer to Connector Listing PDF under RESOURCES tab below for specific cable and conduit ranges
Trade Size
Model Number
BXCS037DSI
cULus: E155411
Standards: UL 514B, CSA C22.2 No. 18.3-12
< Products

Snap Lock® AC/MC Connector

Material: Zinc Die-Cast
Category: Fittings
Sub Category: Flex
Type(s): Connector
Connection Type(s): AC/MC
Feature(s): Snap Lock®

AC/MC connectors are used to terminate AC or MC to a knockout in a dry location box or enclosure.

  • Faster installation with no locknut required
  • Refer to Connector Listing PDF under RESOURCES tab below for specific cable and conduit ranges
Trade Size
Model Number
BXC037S
ABC
0.870.940.4
cULus: E155411
Standards: UL 514B, CSA C22.2 No. 18.3-12
< Products

Double Snap Lock® AC/MC Connector

Material: Zinc Die-Cast
Category: Fittings
Sub Category: Flex
Type(s): Connector
Connection Type(s): AC/MC
Feature(s): Double Snap Lock®Snap Lock®

Double Snap Lock® AC/MC connectors are used to terminate AC, MC or FMC/RWFMC to a knockout in a dry location box or enclosure. The patented Double Snap Lock® design provides a faster installation.

  • No tools required
  • Robust insulator will not fall out
  • Refer to Connector Listing PDF under RESOURCES tab below for specific cable and conduit ranges
Trade Size
Model Number
BXC037DSI
ABC
1.450.760.39
cULus: E155411
Standards: UL 514B, CSA C22.2 No. 18.3-12
< Products

Double Snap Lock® 90˚ Squeeze Connector

Material: Zinc Die-Cast
Category: Fittings
Sub Category: Flex
Type(s): Connector
Connection Type(s): 90 DegreeSqueeze
Feature(s): Double Snap Lock®InsulatedSnap Lock®

Double Snap Lock® 90° squeeze connectors are used to terminate AC, MC or FMC/RWFMC to a knockout in a metal box or enclosure where a 90° bend is required. The patented Double Snap Lock® design provides a faster installation. For dry location applications.

  • No tools required
  • 90° C rated throat insulator
  • Assembled with die-cast locknut and zinc plated steel screws
  • Refer to Connector Listing PDF under RESOURCES tab below for specific cable and conduit ranges
Trade Size
Model Number
ASQ037DSI
ASQ050DSI
ABC
1.371.730
ABC
1.682.060
cULus: E155411
Standards: UL 514B, CSA C22.2 No. 18.3-12
< Products

Snap Lock® Screw-In Connector

Material: Zinc Die-Cast
Category: Fittings
Sub Category: Flex
Type(s): Connector
Connection Type(s): Screw-In
Feature(s): Snap Lock®

Snap Lock® screw-in type connectors are used to terminate FMC/RWFMC to a knockout in a dry location box or enclosure.

  • Faster installation with no locknut required
  • Screws into conduit
Trade Size
Model Number Retail Pack Master Pack Package Type
49170 1 25 Polybag
42170 2 20 Polybag
GC-138 25 2 Contractor Pack
49171 1 25 Polybag
ABC
1.190.830.4
ABC
1.181.30.39
ABC
1.270.830.4
cULus: E155411
Standards: UL 514B, CSA C22.2 No. 18.3-12
< Products

Snap Lock® Saddle Connector

Material: Zinc Die-Cast
Category: Fittings
Sub Category: Flex
Type(s): Connector
Connection Type(s): Saddle
Feature(s): Snap Lock®

Snap Lock® saddle connectors are used to terminate NM, AC or MC to a knockout in a dry location box or enclosure.

  • Faster installation with no locknut required
Trade Size
Model Number Retail Pack Master Pack Package Type
49504 1 25 Polybag
ABC
1.651.040.93
cULus: E155411
Standards: UL 514B, CSA C22.2 No. 18.3-12
< Products

Snap Lock® Clamp Type Connector

Material: Zinc Die-Cast
Category: Fittings
Sub Category: NMSE
Type(s): Connector
Connection Type(s): Clamp Type
Feature(s): Snap Lock®

Snap Lock® clamp type connectors are used to terminate NM Sheathed, Flexible Cord, Oval or Round SE cables to a knockout in a dry location box or enclosure. The Snap Lock® design requires no tools when attaching to the box for faster installation.

  • Faster installation – no locknut assembly
  • Assembled with die cast locknut and zinc plated screws
Trade Size
Model Number Retail Pack Master Pack Package Type
44655 2 25 Polybag
47655 10 10 Polybag
C-505 25 2 Contractor Pack
44665 2 15 Polybag
ABC
0.861.170.39
ABC
11.670.47
cULus: E213494
Standards: UL 514B, CSA C22.2 No. 18.3-12
< Products

Snap Lock® Combination Connector

Material: Zinc Die-Cast
Category: Fittings
Sub Category: Flex
Type(s): Connector
Connection Type(s): Combination
Feature(s): Snap Lock®

Combination connectors are used to terminate AC, MC or FMC/RWFMC to a knockout in a dry location box or enclosure.

  • Faster installation with no locknut required
Trade Size
Model Number Retail Pack Master Pack Package Type
42028 2 12 Polybag
ABC
0.770.910.39
cCSAus: 174008
Standards: UL 514B, CSA C22.2 No. 18.3-12
< Products

Snap Lock® Compression Coupling

Material: Zinc Die-Cast
Category: Fittings
Sub Category: EMT
Type(s): Coupling
Connection Type(s): Compression
Feature(s): Concrete-TightRain-TightSnap Lock®

Snap Lock® compression type couplings are used to join lengths of steel EMT conduit without the use of tools. The patent pending Snap Lock® design provides a faster installation. For wet location applications.

  • Conduit snaps into coupling
  • Concrete-tight
  • Rain-tight
Trade Size
Model Number Retail Pack Master Pack Package Type
49072 1 25 Polybag
49073 1 15 Polybag
ABC
1.351.260.81
ABC
1.431.51.03
cULus: E210498
Standards: UL 514B, CSA C22.2 No. 18.3-12
< Products

Snap Lock® Compression Connector

Material: Zinc Die-Cast
Category: Fittings
Sub Category: EMT
Type(s): Connector
Connection Type(s): Compression
Feature(s): Concrete-TightRain-TightSnap Lock®

Snap Lock® compression type connectors are used to secure and terminate steel EMT conduit to a knockout in a metal box or enclosure. The patent-pending Snap Lock® design provides a faster installation allowing the EMT conduit to snap into the fitting without the use of tools. For wet or dry location applications.

  • Conduit snaps into connector
  • Concrete-tight
  • Rain-tight
Trade Size
Model Number Retail Pack Master Pack Package Type
49032 1 25 Polybag
49033 1 15 Polybag
ABC
1.151.260.39
ABC
1.181.50.39
cULus: E210498
Standards: UL 514B, CSA C22.2 No. 18.3-12
< Products

Snap Lock® Duplex Connector

Material: Zinc Die-Cast
Category: Fittings
Sub Category: Flex
Type(s): Connector
Connection Type(s): Duplex
Feature(s): Snap Lock®

Snap Lock® duplex connectors are used to terminate two runs of AC, MC or FMC/RWFMC to a knockout in a dry location box or enclosure.

  • Faster installation with no locknut required
Trade Size
Model Number Retail Pack Master Pack Package Type
49631 1 12 Polybag
ABC
1.641.450.41
cULus: E155411
Standards: UL 514B, CSA C22.2 No. 18.3-12
< Products

Double Snap Lock® Duplex Connector

Material: Zinc Die-Cast
Category: Fittings
Sub Category: Flex
Type(s): Connector
Connection Type(s): Duplex
Feature(s): Double Snap Lock®Snap Lock®

Double Snap Lock® duplex connectors are used to terminate two runs of AC, MC or FMC/RWFMC to a knockout in a dry location box or enclosure. The patented Double Snap Lock® design provides a faster installation.

  • No tools required
  • Robust insulator will not fall out
Trade Size
Model Number Retail Pack Master Pack Package Type
49635 1 12 Polybag
ABC
2.11.490.4
cULus: E155411
Standards: UL 514B, CSA C22.2 No. 18.3-12
< Products

Double Snap Lock® Cut-In Connector

Material: Zinc Die-Cast
Category: Fittings
Sub Category: Flex
Type(s): Connector
Connection Type(s): Cut-In
Feature(s): Double Snap Lock®Snap Lock®

Double Snap Lock® cut-in connectors are used to terminate AC, MC or FMC/RWFMC to a knockout in an old work (cut-in) dry location box or enclosure. The Double Snap Lock® design provides a faster installation.

  • No tools required
  • Flush mount inside the box
  • Robust insulator will not fall out
Trade Size
Model Number Retail Pack Master Pack Package Type
45510 2 12 Polybag
ABC
1.541.111.1
cULus: E155411
Standards: UL 514B, CSA C22.2 No. 18.3-12
< Products

Double Snap Lock® AC/MC Connector – Steel

Material: Zinc-Plated Steel
Category: Fittings
Sub Category: Flex
Type(s): Connector
Connection Type(s): AC/MC
Feature(s): Double Snap Lock®Snap Lock®

Double Snap Lock® AC/MC connectors are used to terminate AC, MC or FMC/RWFMC to a knockout in a dry location box or enclosure. The patented Double Snap Lock® design provides a faster installation.

  • No tools required
  • Robust insulator will not fall out
Trade Size
Model Number Retail Pack Master Pack Package Type
45065 2 12 Polybag
ABC
1.420.790.39
cULus: E155411
Standards: UL 514B, CSA C22.2 No. 18.3-12
< Products

Snap Lock® AC/MC Connector

Material: Zinc Die-Cast
Category: Fittings
Sub Category: Flex
Type(s): Connector
Connection Type(s): AC/MC
Feature(s): Snap Lock®

AC/MC connectors are used to terminate AC or MC to a knockout in a dry location box or enclosure.

  • Faster installation with no locknut required
Trade Size
Model Number Retail Pack Master Pack Package Type
42502 5 10 Polybag
45502 2 12 Polybag
C-560 25 2 Contractor Pack
ABC
0.870.940.4
cULus: E155411
Standards: UL 514B, CSA C22.2 No. 18.3-12
< Products

Double Snap Lock® AC/MC Connector

Material: Zinc Die-Cast
Category: Fittings
Sub Category: Flex
Type(s): Connector
Connection Type(s): AC/MC
Feature(s): Double Snap Lock®Snap Lock®

Double Snap Lock® AC/MC connectors are used to terminate AC, MC or FMC/RWFMC to a knockout in a dry location box or enclosure. The patented Double Snap Lock® design provides a faster installation.

  • No tools required
  • Robust insulator will not fall out
Trade Size
Model Number Retail Pack Master Pack Package Type
42505 5 10 Polybag
45505 2 12 Polybag
C-570 25 2 Contractor Pack
ABC
1.450.760.39
cULus: E155411
Standards: UL 514B, CSA C22.2 No. 18.3-12
< Products

Double Snap Lock® 90˚ Squeeze Connector

Material: Zinc Die-Cast
Category: Fittings
Sub Category: Flex
Type(s): Connector
Connection Type(s): 90 DegreeSqueeze
Feature(s): Double Snap Lock®InsulatedSnap Lock®

Double Snap Lock® 90° squeeze connectors are used to terminate AC, MC or FMC/RWFMC to a knockout in a metal box or enclosure where a 90° bend is required. The patented Double Snap Lock® design provides a faster installation. For dry location applications.

  • No tools required
  • 90° C rated throat insulator
  • Assembled with die-cast locknut and zinc plated steel screws
Trade Size
Model Number Retail Pack Master Pack Package Type
49815 2 6 Polybag
49816 1 12 Polybag
AB
1.371.73
AB
1.682.06
cULus: E155411
Standards: UL 514B, CSA C22.2 No. 18.3-12