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DD Type - Special Bores

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Double Joint Arrangement
  • Designed with two Lovejoy D Type universal joints and a center connecting shaft
  • DD and DDX Type universal joints are tailored to your specific application requirements
  • This configuration compensates for both parallel misalignment and shaft separation
  • Round, hex, splined, or keyway bores are supplied per your requirements
  • Boot retaining grooves are standard. (Boots are available for purchase separately.)
  • Lubrication is required for optimal wear – boots and lubricant extend universal joint life


·  Correct/Incorrect Assembly


Universal Joints Catalog (full catalog)
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Item #


Bore A & B


Set Screw Size

Keyway A & B (W x D)

Outside Diameter

Overall Length

Bore Depth (Dimension C)

Static Breaking Torque

68514476407 DD4B UJNT 3/8SQ X 3/8 W/SS OE 3/8 Square & 3/8 Round in Steel 8-32 (round end only) No Keyway 0.750 in 5.380 in 0.880 in 768.00 in-lb
68514476277 DD6B UJNT M8THRD BE*OD 6.85OAL M8 Thread in Steel No Setscrew No Keyway 1.000 in 6.850 in 1.000 in 1560.00 in-lb
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