Orbit Industries MRB-350/300 Reducing Bushing 3.5 to 3 in

Product Description

The ORBIT INDUSTRIES MRB-350/300 is a malleable iron reducing bushing designed to reduce a 3.5-inch female hub thread to accept a 3-inch male threaded conduit or hub. Malleable iron construction provides the mechanical durability and impact resistance required for conduit raceway applications in commercial and industrial electrical installations. The bushing threads directly into the larger female opening, maintaining a secure, code-compliant connection without additional adapters or fittings. Licensed electricians and electrical contractors install this fitting as a standard transition component in rigid metal conduit and IMC systems.

This reducing bushing is suited for use wherever a 3.5-inch threaded hub or enclosure knockout must be reduced to accept 3-inch male-threaded conduit, a 3-inch hub, or a 3-inch fitting. Typical applications include junction boxes, enclosures, conduit bodies, and panel knockouts in commercial, industrial, and heavy-duty residential electrical systems. The malleable iron material handles mechanical stress and vibration better than cast fittings, making it appropriate for exposed or high-traffic conduit runs.

Key Features

• Reduces 3.5-inch female hub thread to 3-inch male thread in a single fitting
• Malleable iron construction provides superior mechanical protection for the raceway
• UL Listed under File Number E310658 for code-compliant installations
• Threaded design allows direct installation without additional adapters
• Standard packaging of 5 units per package supports job-site efficiency

Compatibility

Designed as an OEM-style replacement and standard trade fitting for 3.5-inch to 3-inch threaded conduit hub reductions in rigid metal conduit and IMC raceway systems.

Installation Notes

Installation is performed by a licensed electrician in accordance with the National Electrical Code (NEC). De-energize the circuit and verify power is off before working in or near any enclosure or panel. Thread the bushing fully into the female hub by hand, then tighten with an appropriate strap wrench or pipe wrench to achieve a secure, electrically continuous connection. Do not over-tighten, as malleable iron threads can crack under excessive torque.

Technical Specifications

• Trade Size: 3.5 inches to 3 inches
• Material: Malleable Iron
• UL File Number: E310658
• Certifications: UL Listed
• Standard Package Quantity: 5 units

Standard Information

• Brand: ORBIT INDUSTRIES
• Manufacturer Part Number: MRB-350/300