Thomas & Betts 3/8 Inch Steel ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$368.50
Thomas & Betts 300-TB Armored Cable/Flexible Metal Conduit Fittings

Thomas & Betts 3/8 Inch Steel Armored Cable Connector with Zinc Plating

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Model: 300-TB
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$368.50
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Thomas & Betts 3/8 Inch Steel Armored Cable Connector with Zinc Plating

Professional Armored Cable & Flexible Metal Conduit Connection Solution

Thomas & Betts delivers reliable electrical connection performance with this 3/8 inch steel armored cable connector featuring zinc plating for enhanced corrosion resistance. Designed for professional use with armored cable and flexible metal conduit applications, this straight connection fitting provides secure conductor management with a conductor range of 0.470 to 0.660 inches and external thread construction for dependable installation.

Professional Features & Benefits

  • 3/8 Inch Nominal Size: Provides precise fit for standard armored cable and flexible metal conduit applications with reliable connection integrity.
  • Steel Construction: Delivers exceptional durability and mechanical strength for long-term performance in demanding electrical installations.
  • Electro Zinc Plated Finish: Offers superior corrosion resistance and extended service life in various environmental conditions.
  • 0.470 to 0.660 Inch Conductor Range: Accommodates multiple conductor sizes for versatile installation flexibility and professional compatibility.
  • External Thread Design: Ensures secure mechanical connection and easy installation with standard electrical enclosures and junction boxes.
  • UL E23018 Listed: Meets rigorous safety standards for professional electrical installations and code compliance requirements.
  • Straight Connection Type: Provides direct, efficient cable routing without angular deflection for clean, professional installations.

Technical Specifications

  • Color: Metallic
  • Conductor Range: 0.470 to 0.660 Inch
  • Connection: Straight
  • Connection Type Screw Connection To Housing: Other
  • Construction Type: External thread
  • Department: Electrical
  • Etim: EC001180 Screw connection for protective metallic hose
  • Inner Dimensions Inches: 9.5x6.5x4.5
  • Inner Quantity: 100
  • Insulation: No
  • Material: Steel
  • Material Housing: Steel
  • Nominal Size In Inch: 3/8 inch
  • Outer Dimensions Inches: 23.75x7.25x10.25
  • Outer Quantity: 500
  • Product Details: Armored Cable/Flexible Metal Conduit Fittings
  • Product Finish: Electro Zinc Plated
  • Product Group: Conduit & Fittings
  • Product Model: Straight
  • Product Subgroup: Electrical Fittings
  • Product Type: Armored Cable/Flexible Metal Conduit Fittings
  • Revolving Thread: N
  • Standard: UL E23018
  • Surface Protection: Zinc coated
  • Unspsc: 39121419 Flex connectors
  • Weight Uom: 6.88 lbs. per 100

Professional Applications

  • Commercial Building Electrical Systems
  • Industrial Facility Wiring
  • Residential Electrical Installations
  • Data Center Infrastructure
  • Healthcare Facility Electrical Systems
  • Educational Institution Wiring
  • Retail and Office Building Applications

Why Choose Thomas & Betts Quality?

Thomas & Betts delivers proven reliability with UL E23018 listing and professional-grade steel construction with zinc coating for long-term durability. This armored cable connector provides the dependable performance and code compliance that electrical professionals trust for critical installations.

Manufacturer Resources

Spec Sheet

Product Specs

Wire Size:
0.470 to 0.660 Inch
Connection:
Straight
Connection Type Screw Connection To Housing:
Other
Construction Type:
External thread
Etim:
EC001180 Screw connection for protective metallic hose
Inner Dimensions Inches:
9.5x6.5x4.5
Inner Quantity:
100
Insulation:
No
Material Housing:
Steel
Nominal Size In Inch:
3/8 inch
Outer Dimensions Inches:
23.75x7.25x10.25
Outer Quantity:
500
Product Group:
Conduit & Raceway
Revolving Thread:
N
Standards:
UL E23018
Surface Protection:
Zinc coated
Unspsc:
39121419 Flex connectors
Weight Uom:
6.88 lbs. per 100
Department:
Electrical
Product Subgroup:
Flexible Conduit & Fittings
Product Type:
AC/MC/Flex Connector
Product Model:
Straight
Product Finish:
Electro Zinc Plated
Product Details:
Armored Cable/Flexible Metal Conduit Fittings
Product Color:
Metallic
Product Material:
Steel

Thomas & Betts 300-TB – Frequently Asked Questions

1) Is the 300-TB a snap-in connector or does it screw into the box?
It is a threaded, external thread construction connector, so it drops through the knockout and is secured with a locknut from inside the box. If you want a tool-free termination instead, the Arlington Industries 380ST SNAP2IT is a 3/8 inch snap-in MC/AC connector that locks into the knockout without a locknut.
2) What is the closest 3/8 inch MC/AC cable connector alternative to the Thomas & Betts 300-TB?
The Arlington Industries 380ST SNAP2IT snap-in MC/AC cable connector covers the same 3/8 inch cable size and is sold in packs of 100. The difference is how it seats: the 300-TB is a steel-housing fitting with an external thread construction that threads into the box and takes a locknut, while the 380ST is a snap-in design. If the box is already drilled and tapped or you are matching existing threaded fittings, the 300-TB is the direct fit.
3) Is a locknut included with the 300-TB connector?
Plan on supplying the locknut. The 300-TB is specified as an external thread fitting and nothing beyond the connector body is listed as part of the item, so stock 3/8 inch steel locknuts with the order if your boxes are not already fitted.
4) Is the 300-TB steel connector okay in damp or corrosive areas?
The housing is steel with an electro zinc plated finish for corrosion resistance, which suits normal dry and ordinary indoor commercial work. There is no insulated throat on this fitting, so where you need conductor protection at the armor edge, add an anti-short bushing or specify an insulated-throat connector.
5) Which 3/8 inch armored cable connector installs fastest on a high-volume rough-in?
The Arlington Industries 380ST SNAP2IT is a snap-in connector, so the cable is secured without driving a clamp screw. The Thomas & Betts 300-TB uses a screw connection to the housing with external threads, which means a locknut on the inside of the box and a screw to set. Both handle 3/8 inch cable; the 300-TB is the choice where you want a mechanically threaded, zinc-coated steel body with a UL E23018 listing on the fitting.
6) Can the Arlington 380ST and 407AST be used interchangeably with the 300-TB on the same job?
They are not interchangeable one-for-one. All three accept 3/8 inch MC/AC cable, but the 407AST is dedicated to a 3/4 inch knockout while the 380ST is a snap-in for the standard 3/8 inch opening. The Thomas & Betts 300-TB is a straight, externally threaded steel fitting, so it is the one to standardize on when the panel or box prep calls for a threaded hub and locknut rather than a snap-in body.
7) How many 300-TB connectors come in a box, and what does a case weigh?
Inner carton quantity is 100 pieces and the full master case is 500. The 100-count inner runs 6.88 lbs, with inner carton dimensions of 9.5x6.5x4.5 inches and master case dimensions of 23.75x7.25x10.25 inches, which matters if you are staging material by floor on a large MC job.
8) What is the exact part number to order this Thomas & Betts armored cable connector?
Order by manufacturer part number 300-TB from Thomas & Betts. It is the 3/8 inch straight steel AC/MC/flex connector, zinc coated.
9) Do any of these 3/8 inch cable connectors come with an insulated throat?
The Thomas & Betts 300-TB is a non-insulated steel connector with an electro zinc plated finish, rated for a 0.470 to 0.660 inch cable range. If an insulated throat is required by the specification, that is a separate fitting choice - the 300-TB and the Arlington 380ST and 407AST SNAP2IT connectors are all specified by cable size and knockout rather than throat insulation.
How fast can I get the Thomas & Betts 300-TB 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 300-TB come with a warranty?
Absolutely. The Thomas & Betts 300-TB 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 300-TB?
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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