Lovejoy 69790400054 Rigid Coupling Hub 1.5in Bore Carbon Steel

Product Description

The LOVEJOY 69790400054 is a rigid coupling hub designed for direct shaft-to-shaft power transmission in mechanical drive systems. The hub features a 1.5-inch inside bore and a 3.75-inch outside diameter, machined from carbon steel for durability under load. A 0.375-inch-wide by 0.1875-inch-deep keyway provides positive rotational locking to the shaft. Rigid coupling hubs are installed in pairs and are suited for applications where shaft alignment can be held to close tolerance. Maintenance mechanics and millwrights typically install these components during drive system assembly or shaft replacement.

This hub is used in industrial and commercial mechanical drive applications including pumps, compressors, conveyors, and fan systems where rigid, zero-slip shaft connections are required. The carbon steel construction supports moderate to heavy torque loads. It is appropriate for both new installations and replacement service on existing rigid coupling assemblies where the original hub has worn or damaged keyway features.

Key Features

• 1.5-inch inside bore accommodates standard mid-range shaft diameters
• 3.75-inch outside diameter for compatible rigid coupling configurations
• Keyway dimensions of 0.375 inches wide by 0.1875 inches deep for positive shaft engagement
• Carbon steel construction provides strength under torsional and radial loads
• Sold individually for single-hub replacement or paired assembly builds

Compatibility

Designed as an OEM-style replacement rigid coupling hub for mechanical drive systems requiring a 1.5-inch bore with a 3/8 by 3/16 inch keyway configuration.

Installation Notes

Installation is typically performed by a millwright or mechanical technician. De-energize and lock out the drive system before disassembly. Ensure shaft and bore surfaces are clean and free of burrs before pressing or fitting the hub. Verify shaft alignment meets the rigid coupling manufacturer specifications before final assembly, as rigid couplings do not tolerate angular or parallel misalignment.