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Square welded steel electrical box, two-gang, 42 cubic inch capacity, raised TKO knockouts

Hubbell Incorporated

Hubbell Incorporated RACO 258 Electrical Box 42 cu in 2 Gang Steel Square

SKU CH-CVKY-PDXNF

A 42 cu in steel square box with TKO knockouts for multiple conduit runs

  • TypeElectrical Boxes & Covers
  • 42 cu in capacity handles multiple conductor runs
  • Raised TKO knockouts give flexible conduit and cable entry
  • Combination screw heads speed up installation time
  • Welded steel construction provides durable protection
  • UL listed for code-compliant electrical work

42 cu in Steel Square Box

The RACO 258 is a 4-11/16 in. square electrical box built from welded steel for residential and commercial wiring. Its 42.0 cu. in. capacity suits installations where multiple conductor runs split to feed several devices. The two-gang design supports standard device mounting in surface or flush applications. UL listed construction confirms compliance with recognised safety standards.

Knockouts and Welded Construction

One 1/2 in., eight 1 in., and three TKO knockouts provide flexible entry for conduit, NMSC, armoured, metal-clad or flex cable. The welded body maintains rigidity during installation and prevents flex that can loosen connections over time. Combination screw heads accept multiple driver types, reducing tool changes on site. TKO knockouts allow installers to select the required opening without removing unused knockouts.

Two-Gang Mounting Utility

Square geometry accommodates two devices side by side, simplifying power distribution in tight junction locations. Raised grounding provisions support secure equipment bonding. The box accepts standard covers and mud rings for finished installations. Installers needing more than two gangs or a different depth will require an alternative box style.

Highlights

  • 42 cu in capacity handles multiple conductor runs
  • Raised TKO knockouts give flexible conduit and cable entry
  • Combination screw heads speed up installation time
  • Welded steel construction provides durable protection
  • UL listed for code-compliant electrical work

Specifications

BrandRACO
TypeElectrical Boxes & Covers

Questions about this item

How do I mount the RACO 258 steel box and which screw heads speed up the job?

The welded square box uses combination screw heads that accept both slotted and Phillips drivers, letting you secure it to studs or joists with a single bit and reducing the chance of stripping the head during installation.

What parts of the RACO 258 will need attention or replacement after years in service?

The TKO knockouts remain sealed until removed; once a knockout is taken out it cannot be resealed, so any future circuit changes require a new box or a listed closure plate. The steel body and welded seams need no periodic maintenance.

At what fill point does the 42.0 cu. in. capacity become the limiting factor during a long pull?

The 42.0 cubic-inch volume sets the maximum conductor fill under NEC rules; exceeding that count forces you to upsize the box before the insulation or heat rating of the wire becomes the constraint.

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