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RACO 1256 IMC locknut, 4 in threaded steel, zinc plated gray finish

Hubbell Incorporated

Hubbell Incorporated RACO 1256 IMC Locknut 4 in wire cap connector

SKU CH-JX2N-8BDM8

Threaded steel locknut for 4-inch RMC and IMC conduit, zinc-plated and UL-listed

  • TypeCable Management & Conduit
  • Color MappingGray
  • UL 514B and CSA certified for code compliance
  • Zinc-plated steel resists corrosion in damp locations
  • 4 in NPT female threads fit RMC and IMC conduit
  • Compact 7/16 in height saves space in tight boxes
  • Weighs 0.27 lb for easy handling and installation

Trade-size 4 in locknut

The Hubbell RACO 1256 is a zinc-plated steel IMC locknut built for 4 in threaded rigid metal conduit. It meets CSA and UL 514B standards for grounding and mechanical protection in commercial and industrial raceway systems. The female NPT threads accept standard conduit fittings and the gray finish resists corrosion in damp locations. Electricians use it to secure conduit runs where a listed locknut is required by code.

Suited for 4 in RMC and IMC runs

This locknut fits only 4 in trade-size rigid metal or intermediate metal conduit with NPT threads. It will not work with smaller trade sizes, non-threaded conduit, EMT, PVC or flexible metal conduit. Projects that need a smaller locknut, a non-metallic fitting or a different thread type must select another part. Buyers who want more thread engagement or a different material should look elsewhere.

Simple threaded installation

The locknut spins onto the conduit threads by hand and tightens with a wrench; no special tools or clamps are needed. The 7/16 in overall height leaves enough wrench clearance in tight enclosures. Over-tightening can strip the NPT threads or deform the zinc coating, so snug the nut without forcing it. Verify thread alignment before final torque to avoid cross-threading.

Highlights

  • UL 514B and CSA certified for code compliance
  • Zinc-plated steel resists corrosion in damp locations
  • 4 in NPT female threads fit RMC and IMC conduit
  • Compact 7/16 in height saves space in tight boxes
  • Weighs 0.27 lb for easy handling and installation

Specifications

TypeCable Management & Conduit
BrandRACO
Color MappingGray

Questions about this item

What conduit trade size must the installation already use for this locknut to thread on correctly?

The locknut is made for 4 in trade size RMC or IMC conduit, so the existing conduit must match that size.

Will this locknut fit on older rigid metal conduit that uses NPT threads?

Yes, the female threads are cut to NPT standard, so it engages directly with threaded RMC or IMC that follows the same thread form.

How can I confirm the locknut is properly seated after tightening?

When fully tightened the locknut sits flush against the enclosure or fitting with its 7/16 in overall height visible and the zinc-plated gray finish showing no gap.

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