Smith - Blair 4.21031E+13 Bolted Coupling 3in Steel

Product Description

The SMITH - BLAIR 4.21031E+13 is a 3-inch top bolt steel bolted coupling designed for joining pipe sections in water, wastewater, and general utility distribution systems. The top bolt configuration allows for controlled, even compression around the pipe circumference, creating a secure mechanical connection without welding or threading. This coupling is installed by plumbers and utility pipefitters working on municipal, industrial, or commercial piping infrastructure where a reliable field joint is required.

This coupling is suited for use in residential, commercial, and municipal plumbing and utility piping applications where a 3-inch pipe connection is needed. It is a common choice for repair couplings, transition joints, and new installation tie-ins on steel, ductile iron, or compatible pipe materials. Field crews use it in trench repair scenarios and above-grade mechanical rooms alike.

Key Features

• 3-inch nominal pipe size for direct fit on standard 3-inch pipe
• Steel construction for durability in demanding utility and industrial environments
• Top bolt design enables even circumferential clamping force
• Bolted coupling style allows field assembly without welding or threading equipment
• Compatible with common utility piping repair and new-installation workflows

Compatibility

Designed as an OEM-style mechanical coupling for 3-inch nominal pipe in plumbing, water distribution, and utility piping applications. Confirm pipe outside diameter and material compatibility before installation.

Installation Notes

Installation is typically performed by licensed plumbers or qualified pipefitters. Shut off and depressurize the affected pipe section before beginning work, and follow all applicable IPC and local code requirements. Bolt fasteners to manufacturer torque specifications using a calibrated torque wrench, tightening in an alternating cross pattern to ensure even gasket seating. Do not over-torque bolts, as this can damage the gasket and compromise the seal.

Technical Specifications

• Nominal Pipe Size: 3 inches
• Material: Steel
• Coupling Style: Top Bolt Bolted Coupling

Standard Information

• Brand: SMITH - BLAIR
• Manufacturer Part Number: 4.21031E+13