Thomas & Betts 503-TB Armored ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,909.04
Thomas & Betts 503-TB Armored Cable/Flexible Metal Conduit Fittings

Thomas & Betts 503-TB Armored Cable/Flexible Metal Conduit Fittings, 100 Pack

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Model: 503-TB
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$1,909.04
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Armored Cable/Flexible Metal Conduit Fittings

  • Features

    • To couple 1/2 inch flexible metal conduit to 1/2 inch EMT conduit.


503-TB - spec sheet

Manufacturer Resources

Spec Sheet

Product Specs

Etim:
EC000939 Coupler for installation tubes
Inner Dimensions Inches:
4.3x6.5x4.19
Inner Quantity:
10
Material Quality:
Other
Outer Dimensions Inches:
21.5x8.5x3.5
Outer Quantity:
100
Product Group:
Conduit & Raceway
Standards:
UL E23018, CSA
Surface Protection:
Other
Two Piece:
N
Unspsc:
39121434 Electrical metallic tubing EMT connectors
Weight Uom:
23 lbs. per 100
With Inspection Opening And Cover:
N
Department:
Electrical
Product Subgroup:
Flexible Conduit & Fittings
Product Type:
AC/MC/Flex Connector
Product Model:
Conical
Product Finish:
Zinc Plated-Chromate Dipped
Product Details:
Armored Cable/Flexible Metal Conduit Fittings
Product Material:
Metal
Pack size (unit):
100

Thomas & Betts 503-TB – Frequently Asked Questions

1) What does the Thomas & Betts 503-TB coupling actually connect?
The 503-TB is a combination coupling that joins 1/2 inch flexible metal conduit to 1/2 inch EMT. One end takes the flex or armored cable, the other takes the EMT, so you can transition from rigid tubing to flex at a motor, light fixture, or equipment drop without a box.
2) Snap-in MC connector or a flex-to-EMT coupling like the 503-TB, which do I need?
They solve different problems. The 503-TB couples a run of 1/2 inch EMT directly to 1/2 inch flexible metal conduit, no box involved. A snap-in connector like the Arlington SNAP2IT 380ST terminates MC or AC cable into a knockout in a box or enclosure. If your transition happens mid-run between tubing and flex, use the coupling; if the cable lands in a box, use the connector.
3) What is the difference between the Thomas & Betts 503-TB and the Arlington 380ST SNAP2IT connector?
They do two different jobs. The 503-TB is a coupling that joins 1/2 inch flexible metal conduit to 1/2 inch EMT conduit, so it is a conduit-to-conduit transition rather than a box fitting. The Arlington 380ST is a SNAP2IT snap-in MC/AC cable connector sized for 3/8 inch cable, which terminates armored cable into an enclosure knockout. If the run has to continue from flex into EMT, the 503-TB is the piece; if the cable is landing in a panel or box, the snap-in connector is the one that fits.
4) I need to land 3/8 inch MC cable into a 3/4 inch knockout - will the 503-TB work?
No. The 503-TB is built to couple 1/2 inch flexible metal conduit to 1/2 inch EMT and has no knockout termination role. For 3/8 inch MC cable going into a 3/4 inch knockout, the Arlington 407AST SNAP2IT MC cable connector is the item designed for that combination.
5) Is the Thomas & Betts 503-TB UL listed for inspection?
It carries UL file E23018 and is CSA certified, which is what an inspector or a spec writer on an institutional job will be looking for on a flex-to-EMT coupling.
6) Is the 503-TB coupling corrosion protected enough for a damp mechanical room?
The body is metal with a zinc plated, chromate dipped finish, which is the standard corrosion coating for indoor and damp-location steel conduit fittings. It is not a raintight or wet-location fitting, so for direct weather exposure use a fitting rated for that service.
7) How many 503-TB couplings come in a box, and how are they packed?
You get 100 pieces, packed as ten inner cartons of 10. The master carton measures 21.5 x 8.5 x 3.5 inches and the full 100 weighs 23 lbs.
8) Is the 503-TB a one-piece fitting or does it come apart?
One piece. It is not a two-piece assembly and has no inspection opening or cover, so there is nothing to lose on the ladder and no separate gland to assemble before you install it.
How fast can I get the Thomas & Betts 503-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 503-TB come with a warranty?
Absolutely. The Thomas & Betts 503-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 503-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
Why buy the Thomas & Betts 503-TB from ZenSupply?
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