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Aluminium reducing bushing, threaded, plain finish

Appleton Century Crofts

Appleton Century Crofts RB400-350A IMC Reducing Bushing Conduit

SKU CH-9PRS-RQ3Q2

Reduces threaded IMC conduit from four inches to three-and-a-half inches with hazardous-location-rated aluminum construction

  • Product typeCable Management & Conduit
  • Reduces conduit from 4 in to 3-1/2 in for flexible routing
  • Rated for hazardous locations Class I Div 1 and 2 Groups B C D
  • Aluminium construction resists corrosion in tough environments
  • Female to male threaded ends ensure secure IMC connections
  • Compact 1 7/16 in length fits tight enclosures

Conduit Reducer for Hazardous Locations

This reducing bushing connects 3-1/2 inch female-threaded IMC to 4 inch male-threaded conduit in hazardous areas. It carries Class I Division 1 and 2 ratings for Groups B, C, D and Class II Division 1 and 2 for Groups E, F, G. The aluminum body suits industrial electrical installations.

Threaded Transition Changes Conduit Size

The FNPT to MNPT ends let installers step down from larger to smaller trade sizes without extra couplings. Plain aluminum finish resists corrosion in damp or chemical environments. Overall length of 1 7/16 inch keeps the joint compact inside enclosures or junction boxes.

IMC Compatibility Limits Application Scope

This fitting only works with intermediate metal conduit and threaded rigid metal conduit of the stated trade sizes. It cannot join EMT, PVC or flexible conduit types. Buyers needing different hazardous-location ratings or non-threaded connections must select another product.

How it compares

Measured against everything we stock in Electrical Conduit & Fittings, at today’s prices. Recalculated every night.

Price $43.99
Pricier than about 61% of the 1,290 comparable items (median $28.99).

Specifications

Product
Brand nameAPPLETON ELECTRIC
Product typeCable Management & Conduit

Questions about this item

Will the aluminum threads gall or corrode over time in a hazardous location?

The plain-finish aluminum resists galling during installation, and the hazardous-location rating covers Class I Division 1 and 2 Groups B C D so the material is accepted for those atmospheres without additional coating.

At what point does the 1-7/16 in overall length limit the number of bushings I can fit in a tight conduit run?

Each bushing occupies 1-7/16 in of thread engagement, so the total stack length equals that figure multiplied by the quantity used; plan the run accordingly.

Does the half-pound weight add noticeable heat or vibration when the conduit carries heavy current all day?

The bushing is a passive mechanical fitting with no electrical resistance of its own, so it contributes no measurable heat or vibration regardless of the current in the conduit.

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