Topaz Lighting 651SI Steel Com...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$61.97
Topaz Lighting 651SI Steel Compression EMT Connector with Insulated Throat, Zinc-Plated

Topaz Lighting 651SI Steel Compression EMT Connector with Insulated Throat, Zinc-Plated

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Model: 651SI

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

$61.97
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Topaz Lighting 651SI Steel Compression EMT Connector with Insulated Throat, Zinc-Plated

Topaz Lighting's steel compression EMT connector delivers a secure, concrete-tight connection for thin-wall EMT conduit installations, available in trade sizes from 1/2" to 4" to suit a wide range of commercial and industrial projects. Fabricated from strong, resilient steel with a zinc-plated finish, this connector features an insulated throat that protects wires from abrasion at the conduit entry point. Each assembly includes a matching zinc-plated steel locknut and is UL Listed and NEMA/ANSI FB-1 compliant, giving electrical professionals a dependable, code-compliant fitting for EMT conduit runs.

Key Features

  • Trade Size Range: Available in sizes from 1/2" to 4" to accommodate a wide variety of EMT conduit installations.
  • Compression-Type Connection: Provides a secure, concrete-tight joining of thin-wall EMT conduit for reliable mechanical and electrical continuity.
  • Insulated Throat: Built-in insulated throat offers additional protection against wire and cable abrasion at the conduit entry point.
  • Durable Steel Construction: Fabricated from strong, resilient steel for long-lasting mechanical protection in demanding electrical environments.
  • Zinc-Plated Finish: Zinc-plated steel body resists corrosion and provides a clean, professional appearance.
  • Included Hardware: Each assembly includes a zinc-plated steel locknut for a complete, ready-to-install fitting.
  • Conduit Type: Designed specifically for EMT (Electrical Metallic Tubing) thin-wall conduit systems.

Certifications & Compliance

  • UL Listed
  • NEMA/ANSI FB-1 Compliant

Technical Specifications

  • Conduit Type: EMT
  • Pack Size: 100

Typical Applications

  • Commercial and Industrial EMT Conduit Installations
  • Concrete-Tight Conduit and Raceway Systems
  • New Construction and Renovation Electrical Projects
  • Panelboard, Load Center, and Junction Box Connections
  • Applications Requiring Insulated Throat Wire Protection

Why Topaz Lighting?

Topaz Lighting manufactures this EMT compression connector from strong, resilient steel with a zinc-plated finish, ensuring durable mechanical protection across a full range of trade sizes from 1/2" to 4". Each fitting is UL Listed and NEMA/ANSI FB-1 compliant, giving electrical professionals confidence in code-compliant performance. The insulated throat design and included zinc-plated locknut reflect Topaz Lighting's commitment to complete, installation-ready solutions for commercial and industrial conduit systems.

Product Specs

Product Type:
EMT Connector
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
Pack size (unit):
100
Product Finish:
Zinc-Plated
Product Size:
1/2" - 4"
Standards:
NEMA/ANSI FB-1

Topaz Lighting 651SI – Frequently Asked Questions

1) Can I use the Topaz 651SI compression connector on rigid or IMC conduit, or is it EMT only?
EMT only. The 651SI series is a compression fitting made for thin-wall Electrical Metallic Tubing, which has no threads. Rigid and IMC are threaded conduit and need threaded fittings or a threaded-to-EMT coupling instead.
2) What EMT trade sizes do the Topaz SI compression connectors come in?
Trade sizes run 1/2 inch through 4 inch. The orderable sizes are 1/2 (651SI), 3/4 (652SI), 1 (653SI), 1-1/4 (654SI), 1-1/2 (655SI), 3-1/2 (659SI) and 4 inch (660SI). Match the fitting size to the EMT trade size, not to the tubing OD.
3) Do I need a separate locknut and insulating bushing with this Topaz EMT connector?
No on both counts. Each connector ships with a matching zinc-plated steel locknut, and the throat is already insulated, so there is no need to add a plastic bushing at the box entry to protect conductor insulation.
4) Is this connector approved for EMT runs poured in concrete slab?
Yes. The compression design gives a concrete-tight connection, which is what a slab pour or concrete-encased raceway requires. Note it is rated concrete-tight, not raintight, so wet outdoor locations call for a raintight compression fitting instead.
5) Will these Topaz connectors pass inspection on a commercial job?
They are UL Listed and built to NEMA/ANSI FB-1, the standard governing fittings for conduit and cable, which is the pair of credentials an electrical inspector or a spec on a commercial or institutional job normally asks for on EMT fittings.
6) Compression or set-screw EMT connector, which should I be using?
Set-screw fittings are cheaper and fine for dry, indoor, exposed EMT. A compression fitting like the Topaz SI series is what you use when the connection has to be concrete-tight, such as conduit run in a slab or in a location the inspector will not accept set-screw. Compression also seats on the tubing all the way around rather than at one screw point.
7) Is a zinc-plated steel EMT connector okay in a damp interior like a parking garage or mechanical room?
The body is steel with a zinc-plated finish, which resists corrosion for interior and general commercial use. Steel also gives you a solid ground path through the raceway. For genuinely wet or exterior locations, choose a raintight fitting rather than relying on the plating.
8) Why pick an insulated throat connector over a standard EMT compression connector?
The insulated throat protects conductor insulation from abrasion where the wire turns out of the conduit into the box. It matters most on larger sizes and on pulls with a lot of conductors, and it saves adding a separate bushing. The SI suffix on these Topaz part numbers is what identifies the insulated version.
9) How many Topaz 651SI connectors come in a box?
They are packed 100 to the box, which is how the smaller trade sizes are normally bought for rough-in on a commercial job. Order by the quantity of fittings you need for your panel and box terminations.
How fast can I get the Topaz Lighting 651SI 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 651SI come with a warranty?
Absolutely. The Topaz Lighting 651SI 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 651SI?
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 651SI from ZenSupply?
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