Inside Snap Ring Style U-Joint
Measuring Diagram and Series Chart

Width: 
If measuring the ujoint, measure the distance to the outer edge of the snap ring grooves. If measuring the end yoke, measure from the inside flat of one yoke ear to the inside flat of the other ear.

Cap Diameter:
If measuring the ujoint, simply measure the ujoint cap.  If you are measuring the end yoke, measure the width of the opening where the cap sits in the yoke.

 Common Inside Snap Ring U-joint Series Chart

We recommend using a caliper or micrometer to most accurately measure u-joints. U-joint caps must be compressed when measuring the u-joint width. Once you have recorded your measurements, refer to the dimensional charts by u-joint type.