Eaton 421 EMT Combination Coupling - EMT Set Screw - NEC/CEC
Part Number: 421
Quick Summary
The Eaton 421 EMT Combination Coupling provides reliable EMT-to-rigid conduit connections for industrial electrical installations. In practice, mismatched fittings and weak mechanical grip lead to downtime and non-compliant terminations. This product is UL-listed for EMT fittings and NEC/CEC compliant, with additional assurance for Ordinary/Non-Hazardous Locations. These certifications help meet code requirements while reducing risk during commissioning. By combining EMT and rigid styles in a single fitting, it simplifies rough-in work and inventory management. The 421 supports fast installation, reliable grounding paths, and compatibility with standard 3/4" trade sizes, offering value for panel builders, machine builders, and facilities engineers.
Product Information
Extended Description
421 Eaton: Eaton Crouse-Hinds series EMT combination coupling, EMT (set screw) to rigid (set screw), Zinc plated steel, Combination type, 3/4"-3/4"
Product Name
Eaton Crouse-Hinds series EMT combination coupling
Catalog Number
421
UPC
784564104212
Product Length/Depth
2.81 in
Product Height
1.25 in
Product Width
1.25 in
Product Weight
0.25 lb
Area classification
Ordinary/Non-Hazardous Locations
Standards type
NEC/CEC
Conduit type
EMT
Style
Combination
Combination type
EMT (set screw) to rigid (set screw)
Trade size
3/4"-3/4"
Material
Zinc plated steel
Crouse-Hinds series Combination Couplings - EMT catalog page
Combination Couplings - EMT UL certification
Combination Couplings - EMT UL certification
Eaton Specification Sheet - 421
Feature: Zinc plated steel construction provides corrosion resistance in typical industrial environments. Business Impact: Extends service life and reduces replacement costs in panel assemblies and wash-down areas. Application: Suitable for control panels and machine enclosures where reliability matters. Feature: Combination type enables EMT (set screw) to rigid (set screw) in a single fitting. Business Impact: Reduces inventory, speeds field termination, and lowers installation error. Application: Ideal for installations with mixed conduit runs and tight spaces. Feature: 3/4" trade size on both ends ensures consistent fit with common conduit systems. Business Impact: Improves installation accuracy and reduces rework. Application: Widely used in automation rack entries and equipment bays. Feature: UL listing for EMT fittings and NEC/CEC compliance. Business Impact: Supports code-compliant installations and easier inspections. Application: Critical for facilities operating under strict electrical standards. Feature: Ordinary/Non-Hazardous Location classification. Business Impact: Enables safe use in standard plant floors without special enclosures. Application: Suitable for general industrial applications and non-hazardous control rooms. The combination of compact dimensions and standard mounting aligns with existing conduit footprints, facilitating quick upgrades and consistent grounding paths across retrofit projects.
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FAQs
Yes. The Eaton 421 is designed for EMT (set screw) to rigid (set screw) connections at 3/4 inch trade size on both ends. It installs with standard screwdrivers, requires no special tooling, and minimizes field mismatches between EMT and rigid conduits. This streamlines rough-in, reduces stocking variety, and supports fast, reliable terminations on site.
The 421 uses a zinc-plated steel body with two set screws to secure EMT and rigid conduits, delivering a durable mechanical grip and a continuous grounding path. It is UL-listed for EMT fittings and NEC/CEC compliant, ensuring code-conforming terminations in Ordinary/Non-Hazardous locations. Proper torque and alignment are key for long-term reliability in vibratory industrial environments.
This coupling excels in control panels, machine enclosures, and automation cabinets where quick, reliable conduit transitions are needed. Its 3/4" trade size and combination type simplify installations that mix EMT and rigid runs, reducing part counts and downtime. It is well-suited for general industrial, non-hazardous plant areas and routine equipment upgrades.
The 421 adheres to NEC/CEC standards and is UL-listed for EMT fittings, with validation for Canada and the US through UL certification pages. It carries an Ordinary/Non-Hazardous Location classification, supporting compliant use in standard plant environments. These certifications facilitate safer inspections and smoother commissioning in regulated facilities.
Using a single, compatible EMT to rigid coupling reduces the number of components needed, speeding up rough-in and terminations. The UL/NEC/CEC compliance minimizes rework during audits, while the robust zinc-plated steel construction extends service life and lowers replacement costs. Overall, this translates to faster project turnover and lower total cost of ownership.