Lovejoy 69790400056 Rigid Coupling Hub 1.625in Bore Carbon Steel

Product Description

The LOVEJOY 69790400056 is a rigid coupling hub designed for direct-drive shaft connections in industrial and mechanical power transmission applications. The hub features a 1.625-inch inside bore and a 3.75-inch outside diameter, machined from carbon steel for durability under torque loads. A 0.375-inch wide by 0.1875-inch deep keyway is machined into the bore, allowing for positive key-driven shaft engagement. This style of rigid coupling hub is installed by millwrights, mechanical contractors, and maintenance technicians in pump, compressor, conveyor, and general rotating equipment setups where precise shaft alignment is maintained.

Rigid coupling hubs are used in applications where shafts are permanently or semi-permanently coupled with no need for misalignment compensation. Common install scenarios include close-coupled pump assemblies, industrial gearbox output connections, and motor-to-shaft couplings in commercial and light industrial environments. This hub is one half of a complete rigid coupling assembly and must be paired with a matching hub and coupling element or sleeve rated for the application load.

Key Features

• 1.625-inch inside bore diameter for direct shaft fit
• 3.75-inch outside diameter for torque load capacity suited to industrial drives
• Machined keyway at 0.375 inches wide by 0.1875 inches deep for positive shaft engagement
• Carbon steel construction for strength and wear resistance
• Rigid design maintains precise shaft-to-shaft alignment with no flex or float

Compatibility

Designed as an OEM-style rigid coupling hub for industrial power transmission shafts requiring a 1.625-inch bore with a 0.375-inch by 0.1875-inch keyway.

Installation Notes

Installation is performed by qualified millwrights or mechanical maintenance technicians. De-energize and lock out all connected equipment before handling any rotating shaft components, following LOTO procedures per OSHA 1910.147. Shaft and bore surfaces should be clean and free of burrs before pressing or sliding the hub into position. Verify full coupling assembly alignment after installation before returning equipment to service.