Topaz Lighting 661SRT Steel Co...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1.98
Topaz Lighting 661SRT Steel Compression Raintight EMT Coupling, Zinc-Plated

Topaz Lighting 661SRT Steel Compression Raintight EMT Coupling, Zinc-Plated

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Model: 661SRT

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

$1.98
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Topaz Lighting 661SRT Steel Compression Raintight EMT Coupling, Zinc-Plated

The Topaz Lighting 661SRT Steel Compression Raintight EMT Coupling is engineered to deliver secure, concrete-tight and raintight connections when joining ends of thin-wall EMT conduit together. Constructed from durable steel with a zinc-plated finish, this compression-type coupling offers reliable long-term performance in demanding electrical installations. This coupling family is available in trade sizes from 1/2" through 4", is NEMA/ANSI FB-1 compliant, and most sizes are UL Listed, making it a trusted choice for professional electricians and contractors.

Key Features

  • Compression-Type Assembly: Easy-to-install compression design provides a secure, concrete-tight and raintight seal when joining EMT conduit ends, with no set screws required.
  • Durable Steel Construction: Built-to-last steel body delivers exceptional strength and structural integrity for long-term performance in commercial and industrial environments.
  • Zinc-Plated Finish: Zinc-plated surface treatment enhances corrosion resistance and extends service life in wet and exposed locations.
  • Raintight & Concrete-Tight Rated: Provides raintight and concrete-tight protection, suitable for wet locations and direct concrete encasement applications.
  • Wide Trade Size Range: Available in trade sizes from 1/2" through 4" to accommodate a broad range of EMT conduit installations.
  • EMT Conduit Compatibility: Specifically designed for use with thin-wall EMT conduit, ensuring a proper fit and reliable electrical continuity.
  • NEMA/ANSI FB-1 Compliant: Meets NEMA/ANSI FB-1 standards for fittings used with conduit and cable in electrical installations.

Certifications & Compliance

  • UL Listed (most sizes)
  • NEMA/ANSI FB-1 Compliant
  • Raintight Rated
  • Concrete-Tight Rated
  • Suitable for Wet Locations

Technical Specifications

  • Conduit Type: EMT
  • Material: Steel
  • Finish: Zinc-Plated
  • Connection Type: Compression
  • Trade Size Range: 1/2" - 4"
  • Standard: NEMA/ANSI FB-1

Typical Applications

  • Joining thin-wall EMT conduit sections in commercial and industrial electrical systems
  • Outdoor and wet-location conduit raceway installations requiring raintight protection
  • Concrete-encased conduit runs in new construction and renovation projects
  • Exposed conduit systems in manufacturing facilities, warehouses, and utility spaces
  • Electrical rough-in work for residential, commercial, and industrial buildings

Why Topaz Lighting?

Topaz Lighting EMT couplings are built from durable steel with a zinc-plated finish, delivering the corrosion resistance and mechanical strength that professional electrical installations demand. With compression-type assembly, raintight and concrete-tight ratings, and NEMA/ANSI FB-1 compliance across the 1/2" to 4" size range, these couplings are engineered to meet code requirements and perform reliably across a wide range of job-site conditions. Trust Topaz Lighting for quality electrical fittings that stand up to the rigors of commercial and industrial use.

Product Specs

Product Type:
EMT Coupling
Conduit Type:
EMT
Connection Type:
Compression
Listing:
UL Listed
Department:
Electrical
Product Group:
Conduit & Raceway
Product Subgroup:
Conduit Bodies & Fittings
Product Material:
Steel
Product Color:
Zinc-Plated
Product Finish:
Zinc-Plated
Product Size:
1/2" - 4"
Standards:
NEMA/ANSI FB-1

Topaz Lighting 661SRT – Frequently Asked Questions

1) Can a Topaz 661SRT compression coupling be used outdoors or in a wet location?
Yes. The Topaz SRT series steel compression EMT couplings are raintight and concrete-tight, so they hold up in wet locations and in direct concrete encasement. The steel body carries a zinc-plated finish for corrosion resistance, and the line meets NEMA/ANSI FB-1. Set screw couplings are not raintight, so if the run is exposed to weather or getting poured into a slab, compression is the type you want.
2) Will this coupling work on rigid or IMC conduit, or only EMT?
EMT only. It is a compression fitting made for thin-wall EMT, where the gland nut squeezes a ring onto the smooth tube wall. Rigid and IMC are threaded and take a threaded coupling instead, so the SRT will not give you a proper mechanical or electrical connection on those.
3) Do I need a set screw coupling or a compression coupling for EMT?
Set screw is the cheaper choice for dry, indoor, concealed work. Compression, like the Topaz SRT, is what you use when the raceway is outdoors, in a wet location, or encased in concrete, because it seals raintight and concrete-tight at the joint. Many jurisdictions and specs call compression on any exposed or below-grade run for that reason.
4) What trade sizes do the Topaz SRT raintight EMT couplings come in?
The family runs 1/2 inch through 4 inch. Orderable sizes are 1/2 (661SRT), 3/4 (662SRT), 1 (663SRT), 1-1/4 (664SRT), 1-1/2 (665SRT), 2-1/2 (667SRT), 3 (668SRT), 3-1/2 (669SRT) and 4 inch (670SRT). Each size is a separate part number, so order by the trade size of the EMT you are joining.
5) Are Topaz SRT EMT couplings UL Listed?
UL Listed, and compliant with NEMA/ANSI FB-1, the standard governing fittings for conduit and cable. That combination is what most inspectors and spec writers look for on a commercial or institutional raceway submittal.
6) Does the Topaz compression EMT coupling need any tools or extra parts to install?
No separate hardware. Each coupling ships assembled with its compression nuts and rings, so you slide the EMT ends in and tighten the nuts with a wrench. There are no set screws and no threading of the conduit. Make sure the tube ends are cut square and reamed so they seat fully before you torque the nuts down.
7) Is there a 2 inch version of the Topaz SRT raintight coupling?
The SRT couplings are sold in 1/2, 3/4, 1, 1-1/4, 1-1/2, 2-1/2, 3, 3-1/2 and 4 inch. For a 2 inch EMT run, size the fitting to the conduit you are actually joining rather than stepping to an adjacent size, as a compression coupling only seals on the trade size it was built for.
8) Will these couplings keep the raceway bonded as an equipment grounding path?
The steel body and compression connection are made to maintain electrical continuity through the EMT joint, which is how a steel EMT raceway is used as an equipment grounding conductor. The line is UL Listed and meets NEMA/ANSI FB-1. Any fitting relied on for grounding still needs to be made up tight.
9) Is the zinc-plated steel finish good enough for a corrosive or coastal environment?
Zinc-plated steel is aimed at general wet and exposed locations, indoors and out. It handles rain, humidity and concrete contact. For chemically corrosive areas such as wash-down process rooms or salt spray exposure, a zinc-plated steel fitting is generally not the right spec and buyers usually move to a PVC-coated or stainless system.
How fast can I get the Topaz Lighting 661SRT 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 661SRT come with a warranty?
Absolutely. The Topaz Lighting 661SRT 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 661SRT?
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 661SRT from ZenSupply?
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