Product DescriptionThe CROWN ENGINEERING 41906 is a Woods-style coupler end designed for use in flexible jaw coupling assemblies. This component connects a drive shaft to a mating coupler half, transmitting torque between a motor and driven equipment. The 4J jaw configuration pairs with a standard spider insert, and the 1/2-inch bore accommodates common motor and pump shaft sizes. It is installed by millwrights, HVAC technicians, and equipment service professionals in mechanical drive train applications where vibration dampening and misalignment tolerance are required.This coupler end is suited for light-duty to medium-duty rotating equipment commonly found in HVAC systems, pumps, blowers, and general industrial machinery. The 4J jaw size fits within the standard Woods coupling family, making it a straightforward replacement component in existing coupling assemblies. It is appropriate for both residential and light commercial mechanical equipment installations.Key Features4J jaw configuration compatible with standard Woods-style flexible jaw coupling assemblies1/2-inch bore fits common motor and pump shaft diametersDesigned to transmit torque while accommodating minor shaft misalignmentDrop-in replacement style for existing 4J coupling installationsPaired with a separate spider insert to complete the flexible coupling connectionCompatibilityDesigned as an OEM-style replacement coupler end for flexible jaw coupling assemblies using the 4J jaw size and a 1/2-inch bore shaft.Installation NotesInstallation is typically performed by a qualified millwright, HVAC technician, or mechanical equipment service professional. Always de-energize and lock out the motor or drive unit before servicing any coupling component. Ensure the shaft and bore are clean and free of burrs before seating the coupler end, and verify that the mating coupler half and spider insert are in serviceable condition before reassembly. Refer to the equipment manufacturers service documentation for shaft key and setscrew requirements.Technical SpecificationsJaw Size: 4JBore Diameter: 0.5 inchesCoupling Style: Woods flexible jaw coupler endStandard InformationBrand: CROWN ENGINEERINGManufacturer Part Number: 41906