Thomas & Betts 8221 3/4" Threa...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$21.21
Thomas & Betts 8221 3/4" Threadless Rigid Conduit Connector

Thomas & Betts 8221 3/4" Threadless Rigid Conduit Connector

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Model: TB8221

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

$21.21
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Thomas & Betts 8221 3/4" Threadless Rigid Conduit Connector

The Thomas & Betts 8221 is a 3/4" threadless rigid conduit connector designed to deliver a fast, secure mechanical connection between rigid metal conduit (RGD) and electrical enclosures, boxes, or panels. Unlike traditional threaded fittings, the 8221's threadless design allows installers to make up the connection without cutting or chasing threads in the field, saving time on every joint. Sized to the 3/4" trade size, this connector is built to work seamlessly with standard 3/4" rigid conduit runs commonly found in commercial, industrial, and institutional electrical systems. Electrical contractors rely on connectors like the 8221 to maintain a solid mechanical connection at every conduit termination point, helping the overall raceway system perform as intended from installation through the life of the system.

Key Features

  • Trade Size: The 3/4" trade size matches standard 3/4" rigid metal conduit (RGD), ensuring proper fit and alignment at the connection point.
  • Threadless Design: The connector's threadless configuration eliminates the need for field threading tools, reducing labor time and simplifying installation on rigid conduit runs.
  • Rigid Conduit Compatibility: Purpose-built for rigid metal conduit (RMC/RGD) systems, the 8221 is engineered to provide a dependable mechanical connection between conduit and equipment.
  • Secure Connector Type: Designed to join conduit runs to enclosures, junction boxes, and panels, helping maintain a continuous, protected raceway pathway for conductors.
  • Model 8221: Identified by Thomas & Betts model number 8221 within the broader rigid conduit fitting lineup, making it easy to specify and reorder for future projects.
  • Field-Ready Installation: The threadless connection method is intended to speed up rough-in work where multiple conduit-to-box connections must be made efficiently.

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

The 3/4" threadless rigid conduit connector is suited to a range of rigid conduit installation scenarios, including:

  • Commercial and Industrial Electrical Installations
  • Rigid Metal Conduit (RGD) Raceway Systems
  • Conduit-to-Enclosure and Conduit-to-Box Connections
  • Panelboard and Equipment Wiring Connections
  • New Construction and Electrical Renovation Projects

Why Thomas & Betts?

Thomas & Betts is a well-established name in electrical conduit fittings, and the 8221 threadless rigid conduit connector reflects that reputation with a design built for fast, reliable field installation. By eliminating the need for threading, this 3/4" connector helps electrical contractors save time while maintaining a secure mechanical connection between rigid conduit and enclosures. For professionals seeking dependable rigid conduit fittings for commercial and industrial projects, the Thomas & Betts 8221 is engineered to perform where it counts.

Manufacturer Resources

Product Specs

list_batch:
TB-20260918
Product Type:
Conduit Connector
Department:
Electrical
Product Subgroup:
Conduit Fittings
Product Size:
3/4"
Product Group:
Conduit & Raceway
Product Material:
Malleable Iron

Thomas & Betts TB8221 – Frequently Asked Questions

1) Will the Thomas & Betts 8221 connector work on 3/4 inch rigid metal conduit that is already cut and has no threads?
That's exactly what it's for. The 8221 is a threadless connector for 3/4 inch rigid metal conduit (RGD/RMC), so a plain cut end works, no field threading needed. Match it to 3/4 inch trade size conduit only.
2) Is the RACO 4734 liquidtight connector an alternative to the Thomas & Betts 8221 for a 3/4 inch rigid conduit run?
No. The Thomas & Betts 8221 is a 3/4 inch threadless connector made for rigid metal conduit (RGD) terminating into boxes, panels, and enclosures. The RACO 4734 is a 1 inch Type B liquidtight multi-position connector in nylon from the SWIVEL-LOK series, so it is a different trade size, a different raceway type (liquidtight flexible rather than rigid metal), and a nylon body rather than a metallic rigid fitting. For a 3/4 inch RGD termination, the 8221 is the correct fitting of the two.
3) What does the 8221 connect the conduit to?
It terminates a 3/4 inch rigid conduit run into an enclosure, junction box, or panelboard, joining the raceway to the equipment at the knockout.
4) Do I need a threading tool or die to install the 8221?
No threading equipment required. The threadless make-up is the point of the fitting, which is why it gets used on rough-in where a lot of conduit-to-box terminations have to be made quickly.
5) What part number do I order to reorder this same 3/4 inch rigid connector?
Thomas & Betts model 8221. That is the manufacturer part number, and it covers the 3/4 inch size only, so larger or smaller runs need a different trade size fitting.
6) Can I order the RACO 232MSCM instead of the Thomas & Betts 8221 if I need the conduit to land in a box?
They are not interchangeable, and in many cases you need both. The RACO 232MSCM is a 4 in. square welded box, 2-1/8 in. deep, with an M bracket and an integral STAB-IT connector - it is the enclosure itself. The Thomas & Betts 8221 is the fitting that terminates a 3/4 inch rigid metal conduit run into an enclosure, box, or panel. If your rigid conduit is landing at a box that does not already provide a rigid connector, the 8221 makes that connection.
7) The 3M SC0001 is also called a connector - does it do the same job as the Thomas & Betts 8221?
No. The 3M SC0001 is a stem connector in the SC series rated up to 35 kV for 2 and 1 AWG conductors, so it is a conductor connection component for medium-voltage cable work. The Thomas & Betts 8221 is a raceway fitting: a 3/4 inch threadless connector that mechanically joins rigid metal conduit to a box, panel, or enclosure. One terminates a cable, the other terminates a conduit.
8) Is the 8221 suitable for commercial and industrial raceway work?
Yes. It's used in commercial, industrial, and institutional rigid conduit systems, both new construction and renovation, wherever 3/4 inch RGD terminates at equipment.
How fast can I get the Thomas & Betts TB8221 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 Thomas & Betts TB8221 come with a warranty?
Absolutely. The Thomas & Betts TB8221 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 Thomas & Betts TB8221?
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
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