Topaz Lighting 641S Steel Set-...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$41.93
Topaz Lighting 641S Steel Set-Screw Rigid/EMT Coupling, Zinc-Plated

Topaz Lighting 641S Steel Set-Screw Rigid/EMT Coupling, Zinc-Plated

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Model: 641S

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

$41.93
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Topaz Lighting 641S Steel Set-Screw Rigid/EMT Coupling, Zinc-Plated

The Topaz Lighting 641S Steel Set-Screw Rigid/EMT Coupling is engineered to maintain conduit in a fixed, secure position using a threadless set-screw design that delivers a reliable, concrete-tight connection when taped. Constructed from strong, resilient zinc-plated steel, this coupling is built for lasting performance in demanding commercial and industrial electrical installations. This UL Listed coupling is available across trade sizes from 1/2" through 3-1/2", making it a versatile solution for both Rigid and EMT conduit raceway systems.

Key Features

  • Trade Size Range: Available in trade sizes from 1/2" to 3-1/2", accommodating a wide range of Rigid and EMT conduit installations.
  • Durable Construction: Strong and resilient steel construction optimizes performance and longevity across demanding electrical applications.
  • Zinc-Plated Finish: Steel-zinc plated finish provides corrosion resistance and long-term durability in a variety of installation environments.
  • Set-Screw Connection: Threadless, set-screw design ensures a secure, stable connection between conduit sections without the need for threading tools.
  • Concrete Tight When Taped: Coupling achieves a concrete-tight seal when taped, making it suitable for embedded and protected installations.
  • Rigid & EMT Compatible: Designed for use with both Rigid (RMC) and EMT conduit systems, offering broad application flexibility.
  • Fixed Conduit Position: Maintains conduit in a fixed position, preventing movement and ensuring a stable, code-compliant raceway assembly.

Certifications & Compliance

  • UL Listed
  • Concrete Tight When Taped

Technical Specifications

  • Conduit Type: Rigid/IMC, EMT
  • Connection Type: Set Screw
  • Pack Size: 100

Typical Applications

  • Commercial and Industrial Electrical Conduit Installations
  • Rigid (RMC) and EMT Conduit Raceway Systems
  • Concrete-Encased and Embedded Conduit Runs (when taped)
  • New Construction and Renovation Electrical Projects
  • Panelboard, Load Center, and Distribution Wiring Runs

Why Topaz Lighting?

Topaz Lighting's Steel Set-Screw Rigid/EMT Couplings are manufactured from strong, resilient steel with a zinc-plated finish, ensuring reliable performance and corrosion resistance in professional electrical installations. The threadless set-screw design simplifies installation while maintaining a secure, concrete-tight connection when taped, meeting the demands of code-compliant commercial and industrial work. UL Listed and available across a broad range of trade sizes, Topaz Lighting couplings are a trusted choice for electricians and contractors who require dependable, high-quality conduit fittings.

Product Specs

Product Type:
Coupling
Conduit Type:
Rigid/IMC, EMT
Connection Type:
Set Screw
Listing:
UL Listed
Department:
Electrical
Product Group:
Conduit & Raceway
Product Subgroup:
Conduit Bodies & Fittings
Product Material:
Steel
Product Color:
Zinc-Plated
Pack size (unit):
100
Product Finish:
Zinc-Plated
Product Size:
1/2" - 3-1/2"

Topaz Lighting 641S – Frequently Asked Questions

1) Can the Topaz 641S set-screw coupling be used on rigid conduit, or is it EMT only?
Both. The 641S series set-screw coupling is rated for Rigid/IMC and EMT, so you can use it to join EMT runs or to couple threadless rigid and IMC. Because the connection is a set screw rather than a thread, you don't need a threader on site to make up the joint.
2) What trade sizes do Topaz set-screw steel couplings come in, and which part number is which?
Nine trade sizes, 1/2 inch through 3-1/2 inch. The part numbers run in sequence: 641S is 1/2 inch, 642S is 3/4 inch, 643S is 1 inch, 644S is 1-1/4 inch, 645S is 1-1/2 inch, 646S is 2 inch, 647S is 2-1/2 inch, 648S is 3 inch and 649S is 3-1/2 inch. Order by the number that matches your conduit size, not by the series number.
3) Is a set-screw coupling allowed in a concrete pour?
The Topaz 641S steel set-screw coupling is rated concrete tight when taped, so it can go into an embedded or concrete-encased run provided the joint is taped as part of the install. Untaped, it is not a concrete-tight fitting. For wet or direct-burial locations you want a raintight compression fitting instead.
4) Are these Topaz couplings UL Listed for commercial inspection?
Yes, the 641S series steel set-screw couplings are UL Listed, which is what an inspector looks for on a commercial or industrial raceway run.
5) Will a zinc-plated steel coupling hold up in a damp mechanical room or parking garage?
The 641S coupling is steel with a zinc-plated finish, which gives corrosion resistance for indoor commercial and industrial environments and protected locations. It is not a wet-location or raintight fitting on its own, so in continuously wet or exterior exposed runs specify a raintight compression or threaded rigid fitting.
6) Set-screw or compression coupling for EMT, which should I use?
Set-screw, like the Topaz 641S, is the general-purpose indoor choice: faster to make up, no threading, and concrete tight when taped. Compression is what you move to when the run is in a wet or raintight location or where a mechanically tighter joint is specified. For threaded rigid, a threaded coupling makes a stronger joint, but the 641S lets you join rigid or IMC without cutting threads, which is why it gets used on repairs and tie-ins.
7) Do I need any extra hardware or tools to install a Topaz 641S coupling?
No extra parts. The set screws are part of the coupling, so you cut and ream the conduit, slide both ends in and tighten the screws with a flat driver or nut driver. No threading, no dies, no separate locknuts or bushings for a coupling connection. If the joint is going into a pour, add tape at the fitting to get the concrete-tight rating.
8) How many couplings come in a box of Topaz 641S?
Standard pack is 100 pieces. That is worth knowing if you are buying for a single small job rather than a full run, and it makes the series easy to stock on a truck or in an MRO crib by size.
How fast can I get the Topaz Lighting 641S 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 641S come with a warranty?
Absolutely. The Topaz Lighting 641S 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 641S?
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 641S from ZenSupply?
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