Lovejoy 69790400090 Rigid Coupling Hub 5.5 in Carbon Steel

Product Description

The LOVEJOY 69790400090 is a rigid coupling hub designed to create a solid, zero-backlash mechanical connection between two shafts in power transmission applications. Manufactured from carbon steel, it offers the durability and torsional rigidity required in demanding industrial and commercial drive systems. With a 5.5-inch outside diameter, this hub is sized for medium-to-large shaft coupling assemblies. Rigid coupling hubs of this type are typically installed by millwrights, industrial mechanics, and maintenance technicians working on pumps, compressors, fans, and similar rotating equipment. The part weighs 6.9 pounds.

This hub is suited for use in industrial machinery, HVAC drive trains, pump systems, and other rotating equipment where precise shaft alignment can be achieved and maintained. Rigid couplings are preferred in applications where shaft misalignment is not a factor and maximum torque transmission is required. The carbon steel construction makes this hub appropriate for standard industrial environments where corrosion resistance is not a primary concern. Installation is performed during initial equipment assembly or as part of a scheduled drivetrain rebuild.

Key Features

• 5.5-inch outside diameter suits medium-to-large coupling assemblies
• Carbon steel construction provides high torsional strength and durability
• Rigid design delivers zero-backlash shaft-to-shaft power transmission
• Compatible with standard LOVEJOY rigid coupling systems
• Single-piece hub construction for straightforward installation

Compatibility

Designed as an OEM-style rigid coupling hub for use in standard power transmission coupling assemblies requiring a 5.5-inch outside diameter hub.

Installation Notes

Installation of rigid coupling hubs should be performed by a qualified millwright or industrial mechanic. Ensure all connected equipment is fully de-energized and locked out per LOTO procedures before beginning work. Shaft alignment must be verified to within acceptable tolerances before final assembly, as rigid couplings do not accommodate misalignment. Use appropriate press or puller tooling when seating or removing the hub to avoid damage to shaft surfaces or bore finishes.