Arlington Industries 457 Insul...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$15.19
Arlington Industries 457 Insulated Metal Grounding Bushing

Arlington Industries 457 Insulated Metal Grounding Bushing

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Model: 459

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

$15.19
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Arlington Industries 457 Insulated Metal Grounding Bushing

The Arlington Industries 457 is an insulated metal grounding bushing available in trade sizes from 3" through 4", designed to protect conductor insulation at conduit terminations while providing a reliable path to ground. Built from durable metal construction with an integral insulating liner, this grounding bushing is a staple component for electricians working with rigid or IMC conduit systems that require both mechanical protection and electrical continuity. Sold in packages of 5 pieces, the 457 is well suited for larger conduit runs found in commercial, industrial, and institutional electrical installations where code-compliant grounding and conductor protection are essential at every termination point.

Key Features

  • Trade Size Range: Offered in 3" and 4" sizes to match this termination fitting to larger-diameter rigid and IMC conduit runs common in commercial and industrial work.
  • Durable Metal Construction: Metal body provides strength and long-term durability at the conduit termination, standing up to the demands of ongoing installation and service conditions.
  • Insulated Design: An integral insulating liner shields conductor insulation from abrasion against the sharp edges of the conduit end, helping prevent nicks, cuts, or wear that could compromise wire insulation over time.
  • Grounding Function: Provides a bonded, low-resistance connection at the conduit termination, supporting a continuous equipment grounding path as required for safe electrical systems.
  • Package Quantity: Sold in packages of 5 pieces, giving electricians and contractors enough bushings on hand to finish multiple conduit terminations per job.
  • Professional-Grade Fitting: Designed as a straightforward, purpose-built accessory for electricians and contractors who need a dependable bushing for finishing conduit runs at panels, boxes, and enclosures.
  • Made in the USA: Manufactured in the United States, supporting consistent quality control for demanding electrical installations.

Technical Specifications

  • Product Size: 3"
  • Product Size: 4"
  • Package Quantity: 5 pieces
  • Country of Origin: USA
  • Construction: Insulated Metal
  • Type: Grounding Bushing

Typical Applications

  • Commercial and Industrial Electrical Installations
  • Conduit and Raceway Terminations
  • Panelboard and Enclosure Wiring
  • Rigid and IMC Conduit Systems
  • Renovation and New Construction Electrical Work

Why Arlington Industries?

Arlington Industries builds conduit fittings and grounding accessories that electricians rely on for consistent, code-compliant performance on the job. The 457 grounding bushing family combines a durable metal body with an insulated liner across its 3" and 4" sizes, giving installers a dependable way to protect conductor insulation while maintaining a solid grounding connection at larger conduit terminations. Manufactured in the USA and packaged 5 pieces per box, the Arlington 457 delivers the reliable fit and function professionals expect for demanding electrical installations.

Manufacturer Resources

Product Specs

Product Type:
Grounding Bushing
Configuration:
Insulated
Department:
Electrical
Product Group:
Grounding & Bonding
Product Subgroup:
Grounding & Bonding
list_batch:
ARL-20260924
Product Material:
Insulated Metal
Package Quantity:
5 pieces
Country of Origin:
United States
Product Color:
Silver

Arlington Industries 459 – Frequently Asked Questions

1) What trade sizes does the Arlington 457 insulated grounding bushing come in, and which part number is which?
Two sizes. The 3 inch bushing is part number 457 and the 4 inch is part number 459. Both are the same insulated metal grounding bushing, just sized to the conduit. Order by the trade size of the rigid or IMC conduit you are terminating, not the conductor size.
2) Is the Arlington 457 a metal bushing or plastic, and where is the insulation?
Metal body with an integral insulating liner. The metal gives you the mechanical strength and the bonded path at the conduit end; the liner is what the conductors bear against, so insulation is not dragged over the sharp edge of the conduit. That is different from an all-plastic insulating bushing, which protects the wire but does nothing for bonding.
3) Should I use a grounding bushing or just a plain insulated bushing on my conduit termination?
If the termination needs to carry the equipment grounding path, use the grounding type. The Arlington 457 does both jobs: it bonds the conduit termination for a continuous grounding path and protects conductor insulation at the same point. A plain insulated bushing only does the second. Typical case for the grounding version is a rigid or IMC run landing at a panelboard or enclosure where bonding has to be established at the entry.
4) Will the Arlington 457 work on rigid and IMC conduit?
Yes, rigid and IMC are the systems it is built for, in 3 inch and 4 inch trade sizes. Those are threaded conduits, so the bushing threads onto the conduit end at the box or enclosure. It is not the fitting for EMT, which is not threaded.
5) Do I get one bushing or a box when I order the Arlington 457?
They ship five pieces per package. That covers multiple terminations on the same job, so a panel or enclosure with several large conduit entries can usually be finished from one box.
6) Are Arlington 457 grounding bushings made in the USA for a Buy American job?
Country of origin is the United States. That matters on federally funded and institutional work where domestic-origin electrical material is specified.
7) Do I need to order a separate lug or grounding conductor with these bushings?
The bushing itself is the termination fitting. The bonding jumper or grounding conductor that runs from the bushing to the ground bar or enclosure is a separate item and is not part of the 5-piece package. Plan that wire and any lugs into your material list alongside the bushings.
8) I'm standardizing the grounding fittings across a building. Can I use the same part on 3 inch and 4 inch runs?
No, the bushing is size-specific. Use the 457 on 3 inch conduit and the 459 on 4 inch. The construction and the insulated liner are the same across both, so the install method and appearance stay consistent from opening to opening, but each size needs its own part number and its own 5-piece box.
How fast can I get the Arlington Industries 459 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 Arlington Industries 459 come with a warranty?
Absolutely. The Arlington Industries 459 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 Arlington Industries 459?
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 Arlington Industries 459 from ZenSupply?
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