SEPCO S4066 Series Insulated Z...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$0.43
SEPCO S4066 Series Insulated Zinc-Plated Steel EMT Set-Screw Connector

SEPCO S4066 Series Insulated Zinc-Plated Steel EMT Set-Screw Connector

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Model: S4066

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

$0.43
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SEPCO S4066 Series Insulated Zinc-Plated Steel EMT Set-Screw Connector

The SEPCO S4066 Series Insulated EMT Set-Screw Connector is a zinc-plated steel fitting engineered to terminate Electrical Metallic Tubing (EMT) conduit into boxes, panels, cabinets, and other enclosures. This connector family is available in trade sizes from 1/2" through 4" (1/2", 3/4", 1", 1-1/4", 2", 2-1/2", 3", and 4"), letting contractors standardize on one dependable fitting design across an entire EMT raceway run. Every size in the series shares the same set-screw connection method for a secure, mechanically sound termination, and the same insulated throat that helps protect conductor insulation from abrasion as wires are pulled through the fitting. Built in durable zinc-plated steel across the full size range, this connector series is intended for standard commercial and industrial EMT raceway installations where a dependable, long-lasting termination fitting is required.

Key Features

  • Trade Size Range: Offered in sizes from 1/2" up to 4" (1/2", 3/4", 1", 1-1/4", 2", 2-1/2", 3", 4") to match a wide range of EMT conduit diameters on a single connector platform.
  • Set-Screw Termination: The set-screw connection method secures the connector to EMT conduit across every trade size, creating a firm mechanical connection without soldering or specialty tools.
  • Insulated Design: An integral insulated throat helps protect conductor insulation from abrasion during and after installation, reducing the risk of nicked or damaged wire jackets at the termination point.
  • Durable Construction: A zinc-plated steel body resists corrosion and provides long-term mechanical strength, helping the connector hold up in demanding job-site conditions at any size in the series.
  • EMT Compatible: Engineered specifically for terminating Electrical Metallic Tubing (EMT) conduit runs into boxes, panels, and enclosures.
  • Consistent Fit: Sized to mate with standard EMT conduit across the full 1/2" through 4" size range for a secure, straight, properly aligned connection at the box or enclosure knockout.

Technical Specifications

  • Connection Type: Set Screw
  • Trade Size: 1/2" - 4"

Typical Applications

  • Commercial and Industrial Electrical Installations
  • EMT Conduit and Raceway Systems
  • Panelboard and Enclosure Wiring Terminations
  • Branch-Circuit Wiring in Office, Retail, and Institutional Buildings
  • Renovation and New Construction Electrical Work

Why SEPCO?

SEPCO manufactures electrical fittings built for dependable, workmanlike performance on the job site. Across the full S4066 series, the zinc-plated steel construction delivers corrosion resistance and durability, while the insulated throat adds an extra layer of conductor protection at every termination point. With sizes spanning 1/2" through 4", contractors and electricians get a consistent, straightforward EMT termination solution they can install quickly and trust to hold up over time on commercial and industrial raceway projects alike.

Manufacturer Resources

SEPCO Product Catalog

Product Specs

list_batch:
SEP-20260911
Product Type:
Conduit Connector
Connection Type:
Set Screw
Department:
Electrical
Product Group:
Conduit & Raceway
Product Subgroup:
Conduit Fittings
Product Material:
Zinc-Plated Steel

SEPCO S4066 – Frequently Asked Questions

1) Will a set-screw EMT connector work on rigid or IMC conduit?
No. The S4066 series is built specifically for Electrical Metallic Tubing. Set-screw fittings clamp the thin wall of EMT; rigid metal conduit and IMC are threaded and take a threaded coupling or a threaded hub connector instead. Don't substitute these on a rigid run.
2) Why choose an insulated throat EMT connector over a plain steel one?
The insulated throat on the S4066 series puts a non-abrasive liner at the point where conductors turn into the box, which protects wire jackets as they are pulled through and afterward. On runs with larger or stiffer conductors, that's where insulation normally gets nicked. A plain uninsulated connector costs less per fitting but leaves a bare steel edge at the throat.
3) Are these EMT connectors rated for damp or corrosive locations?
The body is zinc-plated steel, which gives corrosion resistance for standard commercial and industrial raceway work. A set-screw connector is not a raintight or concrete-tight fitting, though. For wet locations or where the box must stay sealed, use a raintight compression (gland) EMT connector instead.
4) Do I need any special tools to install a SEPCO set-screw EMT connector?
No specialty tooling. The set-screw method secures the fitting to the tubing with a screwdriver or hex driver, no soldering and no crimp tool. The connector slips over the cut EMT end, the screw is tightened, and the threaded nose drops through the box or panel knockout with a locknut.
5) Can I standardize one connector style across an entire EMT job?
That's the point of the S4066 family. Every size from 1/2 inch through 4 inch uses the same set-screw method, the same insulated throat, and the same zinc-plated steel body, so an MRO stockroom or a contractor's truck carries one fitting design in eight sizes rather than mixing styles across a building.
6) What is this fitting actually used for on a panel or enclosure?
It terminates an EMT run into boxes, panels, cabinets and other enclosures, landing the conduit at a knockout so conductors enter protected. Typical use is branch-circuit work in offices, retail and institutional buildings, panelboard and enclosure terminations, on both new construction and renovation.
How fast can I get the SEPCO S4066 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 SEPCO S4066 come with a warranty?
Absolutely. The SEPCO S4066 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 SEPCO S4066?
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 SEPCO S4066 from ZenSupply?
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