Topaz Lighting Steel Set-Screw...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$239.31
Topaz Lighting Steel Set-Screw Combination Coupling, EMT to Rigid, Zinc-Plated

Topaz Lighting Steel Set-Screw Combination Coupling, EMT to Rigid, Zinc-Plated

(No reviews yet) Write a Review

Model: 391S

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

$239.31
Adding to cart… The item has been added
Free Shipping on orders over $199
We price match and offer bulk discounts! Click Add to Quote. It's quick and easy.
✨
Earn points with this purchase! You can redeem points for giftcards, iPads, XBox's and more. View Rewards
Free Keying on all locks
You may also like

Topaz Lighting Steel Set-Screw Combination Coupling, EMT to Rigid, Zinc-Plated

The Topaz Lighting Steel Set-Screw Combination Coupling is engineered to create a secure, fixed-position transition between EMT and Rigid conduit systems. Constructed from strong, resilient steel with a zinc-plated finish, this combination coupling features a set-screw to clamp-type design that ensures a reliable mechanical connection. Available in trade sizes ranging from 1/2" to 1", this UL Listed coupling is backed by the Topaz lifetime guarantee, making it a dependable choice for professional electrical installations.

Key Features

  • Trade Size Range: Available in trade sizes from 1/2" through 1", accommodating a variety of conduit system configurations.
  • Durable Construction: Strong and resilient steel construction provides long-lasting performance and structural integrity in demanding electrical environments.
  • Set-Screw to Clamp-Type Design: The set-screw to clamp combination design ensures a secure, fixed-position connection between EMT and Rigid conduit, preventing movement or loosening over time.
  • EMT to Rigid Compatibility: Specifically designed as a combination coupling to transition seamlessly between EMT and Rigid (RMC/IMC) conduit systems within the same raceway run.
  • Zinc-Plated Finish: Zinc-plated steel finish enhances corrosion resistance and extends the service life of the fitting in typical indoor and protected installations.
  • Lifetime Guarantee: Backed by the Topaz lifetime guarantee, reflecting confidence in the product's quality and long-term reliability.

Certifications & Compliance

  • UL Listed

Technical Specifications

  • list_batch: TOPAZ-20260727

Typical Applications

  • Transitioning between EMT and Rigid conduit runs in commercial and industrial electrical systems
  • Conduit and raceway system assembly requiring mixed conduit-type connections
  • New construction and renovation electrical rough-in work
  • Indoor electrical installations in commercial buildings, warehouses, and industrial facilities
  • Panelboard and load center conduit feed connections requiring EMT-to-Rigid transitions

Why Topaz Lighting?

Topaz Lighting's Combination Couplings are built from strong, resilient steel with a zinc-plated finish, delivering optimized performance and longevity in professional electrical applications. Each coupling is UL Listed and backed by the Topaz lifetime guarantee, ensuring code-compliant, reliable performance that electricians and contractors can depend on. When your installation demands a secure, fixed-position EMT-to-Rigid transition, Topaz Lighting delivers the quality and confidence your project requires.

Product Specs

Product Type:
Coupling
Conduit Type:
EMT to Rigid
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
Product Size:
1/2"
Pack size (unit):
100

Topaz Lighting 391S – Frequently Asked Questions

1) How do I connect EMT to rigid conduit without threading the EMT?
That is exactly what the Topaz 391S combination coupling is for. One end is a set-screw connection for EMT, the other is a clamp-type end for rigid (RMC/IMC), so you get a fixed transition between the two raceway types in the same run without cutting threads on the EMT. Steel body with a zinc-plated finish, and it is UL Listed.
2) What trade size is the Topaz 391S combination coupling?
The 391S is the 1/2 inch trade size. Topaz builds the combination coupling family in trade sizes from 1/2 inch through 1 inch, so if your run is 3/4 or 1 inch you want the corresponding size in that series rather than the 391S.
3) Can I use a zinc-plated steel set-screw coupling outdoors or in a wet location?
Zinc plating on this steel coupling is corrosion resistance for typical indoor and protected installations, which is how Topaz positions it. Set-screw fittings generally are not raintight unless specifically listed as such, so for wet or outdoor locations look for a compression-style fitting listed for that use instead.
4) How many couplings come in a box of the Topaz 391S?
They pack 100 to the unit. For a contractor doing rough-in that is a full carton, not a single fitting, so plan the count against how many EMT-to-rigid transitions the job actually has.
5) Is the Topaz 391S coupling UL Listed for code-compliant commercial work?
Yes, it carries a UL Listing. That is the piece an inspector or a spec writer on a commercial or industrial job looks for on conduit fittings.
6) Does this coupling work with IMC as well as rigid conduit?
Yes. The clamp end of the Topaz combination coupling is built to take rigid conduit, which Topaz states covers RMC and IMC, mating it to EMT on the set-screw side.
7) Will a set-screw combination coupling let the conduit rotate or pull apart later?
No. The set-screw to clamp design holds a fixed-position joint, so the EMT and rigid stay put rather than working loose over time. If you need a joint that allows some movement or misalignment, a combination coupling is the wrong fitting for it.
How fast can I get the Topaz Lighting 391S 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 391S come with a warranty?
Absolutely. The Topaz Lighting 391S 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 391S?
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 391S from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
!