Appleton 4-350 Malleable Iron 3-piece Conduit Coupling 3.5 in

Product Description

The APPLETON 4-350 is a 3-piece malleable iron conduit coupling designed for 3.5-inch trade-size conduit runs. This fitting connects two sections of rigid metal conduit (RMC) or intermediate metal conduit (IMC) where standard one-piece couplings cannot be installed due to limited access or fixed conduit positions. The three-piece design allows the coupling to be assembled around stationary conduit without rotating either conduit section. Licensed electricians and electrical contractors install this type of fitting in industrial, commercial, and heavy-duty residential conduit systems that require a secure, code-compliant mechanical connection.

The 4-350 is suited for 3.5-inch rigid or intermediate metal conduit installations in applications where conduit cannot be turned, such as long straight runs, conduit already anchored to structure, or retrofit work on existing raceways. Common install environments include industrial plants, commercial buildings, utility infrastructure, and similar settings where malleable iron fittings are specified for mechanical durability and resistance to physical damage.

Key Features

• Three-piece construction allows installation on fixed conduit without rotating either section
• Malleable iron body provides high mechanical strength and impact resistance
• Sized for 3.5-inch trade-size conduit (RMC or IMC)
• Compact form factor at approximately 6.9 x 5.3 x 4.1 inches overall package dimensions
• Weighs 5.5 pounds, consistent with heavy-duty malleable iron construction

Compatibility

Designed as an OEM-style replacement or new-installation fitting for 3.5-inch trade-size rigid metal conduit or intermediate metal conduit systems.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. De-energize all circuits in the conduit run before beginning work. Ensure conduit threads are clean and free of burrs before assembly; apply listed thread compound or tape as required by the authority having jurisdiction. Tighten all three coupling sections evenly to achieve a secure, continuous metallic raceway bond.

Technical Specifications

• Trade Size: 3.5 inches
• Material: Malleable iron
• Pieces: 3-piece assembly
• Package Dimensions (L x W x H): 6.9 x 5.3 x 4.1 inches
• Weight: 5.5 pounds
• UPC: 78312661285

Standard Information

• Brand: APPLETON
• Manufacturer Part Number: 4-350