027SG80002 – Cv Double Joints Heads – Pilot Dia 3.819″ – Bolt Circle Dia 3.386″ – Bolt Hole Dia 0.330

The 027SG80002 provides CVJ series CV constant-velocity output for driveshafts operating at angles where conventional U-joints fail to deliver smooth rotation. The centering socket bisects the total operating angle, ensuring the second joint cancels the velocity error introduced by the first.

Technical Specifications

Constant-Velocity Principle in Double-Cardan Joints

A single Cardan U-joint operating at an angle produces an output shaft speed that varies sinusoidally at twice the input frequency. This variation is small at low angles (under 3 degrees) but grows rapidly with increasing angle. At 10 degrees, the speed fluctuation is noticeable as a vibration. The double-Cardan design uses two joints in series, phased so each joint's variation is equal and opposite. A centering socket maintains the precise bisect angle between the joints to guarantee cancellation. The 027SG80002 incorporates this design in the CVJ series for high-angle shaft applications.

Assembly and Maintenance

• Grease both U-joint crosses and the centering socket through Zerk fittings before first use
• Relubricate every 30,000 miles or when operating in water-crossing or dusty conditions
• Confirm 3.386 bolt circle matches the companion flange before final assembly
• After welding the tube, dynamically balance the completed shaft to specification

Available Now

The 027SG80002 ships from Universal Driveshafts' inventory. Our driveline engineers can assist with operating angle calculations, tube selection, and complete shaft design for custom applications.