Thomas & Betts 1-1/4 Inch Armo...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$87.41
$10.32
Thomas & Betts 257 1 1/4 INCH CONNECTOR

Thomas & Betts 1-1/4 Inch Armored Cable Connector - Malleable Iron Construction

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Model: 257
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$87.41
$10.32
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Thomas & Betts 1-1/4 Inch Armored Cable Connector

Professional Armored Cable & Flexible Metal Conduit Connection Solution

The Thomas & Betts 1-1/4 inch armored cable connector delivers reliable electrical connections for armored cable and flexible metal conduit applications. Constructed from durable malleable iron with a metallic finish, this professional-grade connector ensures secure termination and long-lasting performance in electrical installations.

Professional Features & Benefits

  • 1-1/4 Inch Size: Accommodates standard armored cable and flexible metal conduit for versatile installation applications.
  • Malleable Iron Construction: Provides exceptional durability and resistance to mechanical stress in demanding electrical environments.
  • Metallic Finish: Offers corrosion resistance and professional appearance for long-term reliability.
  • Armored Cable Compatible: Specifically designed for secure termination of armored cable systems with proper grounding continuity.
  • Flexible Metal Conduit Ready: Ensures reliable connection for flexible metal conduit installations with secure mechanical attachment.
  • Professional Grade Design: Engineered to meet electrical connector standards for commercial and industrial applications.

Technical Specifications

  • Color: Metallic
  • Department: Electrical
  • Material: Malleable Iron
  • Number Of Batteries: 0
  • Product Group: Connectors
  • Product Subgroup: Electrical Connectors
  • Product Type: Armored Cable/Flexible Metal Conduit Fittings

Professional Applications

  • Commercial Building Electrical Systems
  • Industrial Facility Installations
  • Residential Electrical Projects
  • Professional Office Buildings
  • Retail and Service Establishments
  • Educational and Healthcare Facilities
  • Multi-Unit Residential Properties

Why Choose Thomas & Betts Quality?

Thomas & Betts electrical connectors deliver proven reliability through professional-grade malleable iron construction and metallic finish protection. This armored cable connector provides the durability and performance electrical professionals trust for secure, long-lasting connections in demanding applications.

Manufacturer Resources

Product Specs

Number Of Batteries:
0
Product Group:
Conduit & Raceway
Product Type:
AC/MC/Flex Connector
Department:
Electrical
Product Subgroup:
Flexible Conduit & Fittings
Product Color:
Metallic
Product Material:
Malleable Iron

Thomas & Betts 257 – Frequently Asked Questions

1) What size armored cable does the Thomas & Betts 257 connector take?
The 257 is a 1-1/4 inch connector, sized for 1-1/4 inch armored cable (AC/MC) and flexible metal conduit. If you're terminating smaller cable, this is the wrong trade size, 3/8 inch MC for example needs a 3/8 inch connector like the Arlington 380ST.
2) Is the Arlington 380ST a substitute for the Thomas & Betts 257 connector?
No. The Thomas & Betts 257 is a 1-1/4 inch armored cable and flexible metal conduit connector built from malleable iron, while the Arlington 380ST SNAP2IT is a 3/8 inch snap-in MC/AC cable connector. The 380ST is sized for 3/8 inch MC and AC cable, so it will not terminate the 1-1/4 inch runs the 257 is made for. Use the 380ST only where the cable itself is 3/8 inch.
3) Is the T&B 257 connector rated for both AC cable and flexible metal conduit, or just one?
Both. The 257 is listed as an AC/MC/Flex connector and the product data covers armored cable termination and flexible metal conduit, so one part number handles either on a 1-1/4 inch run.
4) What is the Thomas & Betts 257 connector made of, and will it hold up in an industrial panel room?
Malleable iron body with a metallic finish. That is the heavier-duty choice over die-cast zinc or steel snap-in fittings and is what the data cites for mechanical stress resistance and corrosion resistance, which is why it gets specified in commercial and industrial work rather than residential-only installs.
5) What is the exact part number to order for a Thomas & Betts 1-1/4 inch AC connector?
Order Thomas & Betts 257. That is the manufacturer part number for the 1-1/4 inch armored cable / flex connector, and it is the single model offered.
6) How does the T&B 257 differ from an Arlington SNAP2IT connector?
Different install method and different size class. The 257 is a 1-1/4 inch malleable iron connector. The Arlington SNAP2IT line we carry, the 380ST at 3/8 inch and the 407AST for 3/8 inch cable into a 3/4 inch knockout, are snap-in fittings sold in 100-packs for high-volume small MC work. For 1-1/4 inch terminations, the 257 is the one that matches the trade size.
7) Will the 257 connector maintain ground continuity on an MC cable run?
Yes, the 257 is built for secure termination of armored cable systems with proper grounding continuity, and the malleable iron body provides the metallic path. Standard practice still applies: the cable armor must be properly seated and the locknut drawn tight to the box.
8) I want a connector that snaps in instead of using a setscrew - what are my options for MC cable?
The Arlington SNAP2IT line installs by snapping into the knockout rather than being secured with a locknut and setscrew: the 380ST handles 3/8 inch MC/AC cable, and the 407AST is an MC cable connector for a 3/4 inch knockout with 3/8 inch cable. Both are 3/8 inch cable fittings, so they cover small MC runs. The Thomas & Betts 257 remains the choice when the cable or flexible metal conduit is 1-1/4 inch.
9) What is the difference between the Arlington 380ST and 407AST if I only need 3/8 inch MC connectors?
Both are Arlington SNAP2IT connectors for 3/8 inch cable. The 380ST is listed as a snap-in MC/AC cable connector at 3/8 inch, and the 407AST is specified by its box opening - a 3/4 inch knockout with 3/8 inch cable - so it is the one to pick when the enclosure has a 3/4 inch hole. Neither covers 1-1/4 inch armored cable, which is what the Thomas & Betts 257 terminates.
10) Can I use the Thomas & Betts 257 in a healthcare or multi-family building install?
Yes. The 257 is specified for commercial building electrical systems, industrial facilities, educational and healthcare facilities, multi-unit residential, office, retail and residential projects, so it is a reasonable standard for an MRO buyer looking to stock one 1-1/4 inch connector across a portfolio.
11) Which connector holds up better to rough handling on a commercial job, the Thomas & Betts 257 or the Arlington SNAP2IT fittings?
The Thomas & Betts 257 is a malleable iron body with a metallic finish, giving it a metal housing throughout and resistance to mechanical stress in commercial and industrial runs. The Arlington 380ST and 407AST are SNAP2IT series connectors designed around a snap-in installation into the knockout. The 257 is also the larger fitting at 1-1/4 inch, while both Arlington parts are 3/8 inch cable connectors, so in practice the choice is driven by cable size first.
How fast can I get the Thomas & Betts 257 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 257 come with a warranty?
Absolutely. The Thomas & Betts 257 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 257?
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 Thomas & Betts 257 from ZenSupply?
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