Cap Diameter:When measuring the u-joint cap, measuring the bearing cap diameter. If you are measuring the end yoke, measure the width of the opening where the cap sits in the yoke.

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 charts by u-joint type.

The u-joint series is specific to each cross measurement as described below based on the cap diameter and span over the crosses.

Mar-Bro produces standards, specials, MS and NAS fasteners with diameters from #00 – 3/4″ (M1.0 – M19) and lengths from .050 – 10″ (1.5mm – 254mm).

Free ground shipping on all driveshafts and orders over $100 within the continental USA! Custom & conversion driveshafts are on sale up to $75 off through January.

Click on a head style for detailed information on dimensional, mechanical, and material specifications. If you cannot find what you are looking for or have questions regarding special orders, please contact us. We look forward to hearing from you.

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)

Width: When measuring the u-joint, compress the caps and measure from the snap ring groove to snap ring groove. If measuring the end yoke, measure from the inside flat of one yoke ear to the inside flat of the other ear.

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