Smith Blair 421-04460560-031 4 Inch Steel Bolted Coupling

Product Description

The SMITH BLAIR 421-04460560-031 is a 4-inch top-bolt steel bolted coupling designed for joining pipe sections in water, wastewater, and industrial piping systems. This style of bolted coupling uses a top-bolt configuration to draw housing segments together around the pipe, creating a mechanical joint that accommodates minor misalignment and end movement. Fabricated from steel, the coupling provides the structural rigidity required for buried or exposed service in demanding utility and municipal applications. It is typically installed by plumbers, pipefitters, and utility crew technicians working on distribution and transmission mains.

This coupling is suited for residential, commercial, and municipal piping applications where a reliable mechanical joint is needed on 4-inch pipe. Top-bolt couplings of this type are commonly used in water main repairs, service line connections, and wastewater force main installations. The bolted design allows for field assembly without special tooling beyond standard wrenches, making it practical for trench work and tight-space installations.

Key Features

• 4-inch nominal pipe size for compatibility with standard 4-inch pipe OD ranges
• Top-bolt configuration simplifies tightening access in trench or confined-space installs
• Steel construction provides high structural strength for buried and exposed service
• Bolted housing segments draw together evenly for a consistent mechanical seal
• Accommodates minor pipe misalignment and angular deflection typical of field conditions

Compatibility

Designed as an OEM-style mechanical replacement coupling for 4-inch nominal pipe in water, wastewater, and industrial piping systems. Refer to SMITH BLAIR sizing charts to confirm pipe outside diameter compatibility before installation.

Installation Notes

Installation should be performed by a licensed plumber or qualified pipefitter in accordance with local plumbing codes and applicable AWWA standards. Depressurize and isolate the pipe section before beginning any coupling work. Tighten bolts evenly in an alternating sequence to achieve uniform gasket compression — do not fully torque one bolt before progressing to others. Inspect gasket seating and pipe end condition before final assembly.

Technical Specifications

• Pipe Size: 4 inches
• Material: Steel
• Coupling Style: Top Bolt Bolted Coupling
• Order Increment: 1

Standard Information

• Brand: SMITH BLAIR
• Manufacturer Part Number: 421-04460560-031