Lovejoy 68514417005 Dd-type Double Universal Joint

Product Description

The LOVEJOY 68514417005 is a DD-Type double universal joint designed to transmit rotational motion between shafts that are misaligned or require angular flexibility. The double universal joint configuration cancels the velocity variation inherent in single-joint designs, delivering smoother output rotation across the operating range. This joint handles up to 378 in/lb of torque and accepts a 5/8 inch bore depth, making it well-suited for mechanical drive applications where compact geometry and reliable torque transfer are required. HVAC, industrial equipment, and mechanical system technicians routinely install this type of component in actuator linkages, damper drive assemblies, and light-duty power transmission setups.

This double universal joint is applicable in residential and light commercial mechanical systems where shaft misalignment must be accommodated without sacrificing rotational consistency. The DD-Type design is commonly found in HVAC damper actuator drive trains, fan blade pitch control assemblies, and similar equipment requiring flexible shaft couplings. With a 4 inch overall length and a 1/4 inch inside diameter paired with a 1/2 inch outside diameter, it fits into tight drive linkage configurations typical of rooftop units and air handling equipment.

Key Features

• DD-Type double universal joint design cancels output velocity variation for smoother power transmission
• 378 in/lb torque capacity suits light-to-medium mechanical drive applications
• 5/8 inch bore depth accommodates standard shaft sizes in common actuator and drive linkage setups
• 4 inch overall length fits compact drive train configurations
• 1/4 inch inside diameter with 1/2 inch outside diameter for precise shaft and housing fitment
• Lightweight at 0.26 pounds, minimizing added load on driven assemblies

Compatibility

Designed as an OEM-style replacement for DD-Type double universal joint applications requiring a 5/8 inch bore depth and up to 378 in/lb torque capacity in mechanical drive and actuator linkage assemblies.

Installation Notes

Installation should be performed by a qualified mechanical or HVAC technician. De-energize all equipment and lock out power before removing or installing drive components. Ensure the connected shafts are properly aligned within the joint operating angle range before securing. Do not exceed the rated torque capacity during operation, as overloading universal joints can cause premature wear or failure.