Wing Bearing Style U-Joint
Measuring Diagram and Series Chart

The wing bearing u-joint series classifies the size of the universal joint based on the pilot diameter, the distance between the bolt holes and key way width. Wing style u-joint caps bolt on a machined face and key way.  Note: the RPL style does not have a machined face with key way. 

Pilot Diameter: 
Pilot diameter measurement is taken over the outside of the wing bearing caps. Prior to taking measurements fully compress the bearing caps. 

Between Bolts:
Centerline of bolt hole to centerline of bolt hole on each bearing.

Cap Type:
The medium and heavy duty U-joints come in five different styles:

Low Wing Threaded (LWT), Low Wing Drilled (LWD), High Wing Threaded (HWT), High Wing Drilled (HWD),  Delta Wing Threaded (TBC/DWT)

 Wing Bearing 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 dimension over the caps. Once you have recorded your measurements, refer to the dimensional chart to find your u-joint series.