How to Identify U Joints

What U Joint Series Do I Have?

Universal joints, also called U joints, are a very vital part in the operation of your drive shaft and having the right series of U joint is crucial. There are many different series of u-joints. We carry a wide selection of U-joints for many different series. In the event that there is a u joint that we do not stock in our inventory, we can easily order the part for you, along with other parts.

When identifying U-joints, the first thing to identify is whether the U-joint has inside or outside snap rings.

After identifying the configuration of the snap rings, then it’s time to find the dimensions of your U-joint. You will need to find the diameter of one of your u-joint’s caps. This needs to be done for u-joints with inside or outside snap rings. The other dimension that you need to find varies between the two types of u-joint configurations.

For u-joints with inside snap rings, you will see a groove on all of the u-joint caps. You will need to measure from the edge of one snap ring groove straight across to the edge of the other snap ring groove. For U-joints with outside snap rings, you will need to measure from the edge of one u-joint cap straight across to the edge of the other u-joint cap.

With these dimensions, it will be easy to identify what series of U-joint that you have. Another way to identify a u-joint is by properly measuring the pinion yoke.

Each diagram below will show you which measurements to take in order to identify your u joint.


Top View of Inside Snap Ring Yoke

Side View of Inside Snap Ring Yoke


Side View of Pinion Yoke with Tabs

Top View of Pinion Yoke with Tabs


Need to order a custom drive shaft?