Lovejoy 69790400080 Rigid Coupling Hub 1.875in Bore

Product Description

The LOVEJOY 69790400080 is a rigid coupling hub designed for shaft-to-shaft power transmission in mechanical drive systems. It features a 1.875-inch inside bore and a 4.75-inch outside diameter, with a 0.5-inch keyway width and 0.25-inch keyway depth for positive rotational locking. Constructed from carbon steel, this hub delivers the strength and dimensional stability required in demanding industrial and commercial mechanical applications. Licensed millwrights, maintenance mechanics, and industrial service technicians typically install this component as part of a complete rigid coupling assembly.

This rigid coupling hub is suited for use in pump drives, compressor assemblies, conveyor systems, and other rotating equipment where shaft misalignment must be held to a minimum. Rigid couplings transmit torque without flex, making precise shaft alignment a prerequisite during installation. The with-keyway configuration accommodates standard keyed shafts in the 1.875-inch bore range, providing a mechanical interlock that prevents relative rotation between the hub and the shaft under load.

Key Features

• 1.875-inch inside bore fits standard keyed shafts in that diameter range
• 4.75-inch outside diameter suits medium-duty coupling assembly configurations
• 0.5-inch wide by 0.25-inch deep keyway provides positive shaft engagement
• Carbon steel construction offers high tensile strength and wear resistance
• Rigid design transmits full torque without torsional flex or cushioning

Compatibility

Designed as an OEM-style replacement or service replacement rigid coupling hub for mechanical drive systems requiring a 1.875-inch bore keyed shaft interface. Verify outside diameter and keyway dimensions against the mating coupling half before installation.

Installation Notes

Installation should be performed by a qualified millwright or mechanical technician. De-energize all drive equipment and lock out the power source before handling any shaft coupling components, following LOTO procedures per OSHA and facility standards. Shaft and bore surfaces should be clean and free of burrs before pressing or fitting the hub. Precise shaft alignment is critical with rigid couplings, as any angular or parallel misalignment will transmit directly to connected bearings and seals.