Topaz Lighting 646-649 Zinc Di...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$2.79
Topaz Lighting 646-649 Zinc Die-Cast Set-Screw EMT Coupling

Topaz Lighting 646-649 Zinc Die-Cast Set-Screw EMT Coupling

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Model: TOP-646

In Stock (leaves warehouse same day if ordered before 3pm ET)

$2.79
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Topaz Lighting 646-649 Zinc Die-Cast Set-Screw EMT Coupling

The Topaz Lighting 646-649 Zinc Die-Cast Set-Screw EMT Coupling connects ends of thin-wall EMT conduit in commercial and industrial electrical installations, available in 2" and 3-1/2" trade sizes. Constructed of corrosion-resistant zinc die-cast, this coupling delivers concrete-tight protection when taped for a reliable, durable raceway connection, and the 3-1/2" size is also suitable for use with rigid conduit. UL Listed and NEMA/ANSI FB-1 compliant, it meets the demands of professional electrical work across commercial and industrial applications.

Key Features

  • Trade Size: Available in 2" and 3-1/2" trade sizes for connecting thin-wall EMT conduit runs.
  • Durable Construction: Manufactured from corrosion-resistant zinc die-cast for long-lasting performance in demanding electrical environments.
  • Set-Screw Connection: Set-screw type assembly provides a solid, secure connection; compatible with a standard slotted head screwdriver for fast, reliable installation.
  • Concrete-Tight Protection: Provides concrete-tight protection when taped, safeguarding conduit connections in embedded or exposed concrete applications.
  • Dual Conduit Compatibility: The 3-1/2" size is suitable for use with both EMT and rigid conduit, adding flexibility to raceway system design.
  • Code-Compliant Design: UL Listed and NEMA/ANSI FB-1 compliant, meeting industry standards for safety and performance in professional electrical installations.

Certifications & Compliance

  • UL Listed
  • NEMA/ANSI FB-1 Compliant
  • Concrete-Tight When Taped

Technical Specifications

  • Conduit Type: EMT
  • Connection Type: Set Screw
  • Listing: UL Listed, NEMA/ANSI FB-1 Compliant
  • Pack Size: 100

Typical Applications

  • Connecting Thin-Wall EMT Conduit Sections in Commercial and Industrial Electrical Systems
  • Conduit and Raceway Installations Requiring Concrete-Tight Protection When Taped
  • Rigid Conduit Connections in the 3-1/2" Trade Size
  • New Construction and Renovation Electrical Rough-In Work
  • Panelboard, Load Center, and Branch Circuit Wiring Runs

Why Topaz Lighting?

Topaz Lighting EMT couplings are built from corrosion-resistant zinc die-cast, ensuring structural integrity and long-term reliability across installation environments. Their UL Listed and NEMA/ANSI FB-1 compliant design gives electrical professionals confidence that every connection meets recognized industry safety standards. From light commercial to heavy industrial applications, Topaz Lighting couplings deliver the consistent, code-compliant performance that contractors and electricians depend on.

Product Specs

Product Type:
Coupling
Conduit Type:
EMT
Connection Type:
Set Screw
Listing:
UL Listed
Department:
Electrical
Product Group:
Conduit & Raceway
Product Subgroup:
Conduit Bodies & Fittings
Product Material:
Zinc Die-Cast
Pack size (unit):
100
Product Size:
2" - 3-1/2"
Standards:
NEMA/ANSI FB-1

Topaz Lighting TOP-646 – Frequently Asked Questions

1) Can I use a Topaz 649 coupling on rigid conduit instead of EMT?
Yes, in the 3-1/2 inch size. The 649 is rated for use with both EMT and rigid conduit. The 2 inch 646 is an EMT-only fitting, so don't substitute it on a rigid run.
2) Is a set-screw EMT coupling OK to bury in concrete?
The Topaz 646/649 couplings are concrete-tight when taped, so they're acceptable in embedded or poured-concrete work provided the joint is taped per that requirement. Untaped, they are not concrete-tight. If the run is in a wet or direct-burial location, a set-screw fitting is the wrong choice and you want a raintight compression fitting instead.
3) Should I use a set-screw coupling or a compression coupling on my EMT run?
Set-screw, like the Topaz 646 and 649, is the standard choice for dry interior commercial and industrial work. It goes together fast with a slotted screwdriver and holds the conduit with screws rather than a gland. Compression couplings cost more and are what you use where the raceway has to be raintight or in damp locations. For concrete work, set-screw is fine here as long as the joint is taped.
4) Will zinc die-cast couplings hold up in an industrial environment?
The body is corrosion-resistant zinc die-cast, which is the normal material for set-screw EMT fittings in commercial and industrial interiors. It resists corrosion in typical plant and warehouse conditions, but zinc die-cast set-screw fittings are not intended for corrosive or continuously wet exposure.
5) What tool do I need to install the Topaz 646/649 coupling?
A standard slotted-head screwdriver. Slide the coupling over the cut EMT ends and tighten the set screws down onto the conduit wall. No threading, no dies, no reaming tool beyond deburring the conduit cut.
How fast can I get the Topaz Lighting TOP-646 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Topaz Lighting TOP-646 come with a warranty?
Absolutely. The Topaz Lighting TOP-646 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Topaz Lighting TOP-646?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Topaz Lighting TOP-646 from ZenSupply?
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